Iceland Weather by Month – Your Complete Guide to Conditions

Iceland’s weather is known for its unpredictability, featuring sudden changes, powerful winds, and varying conditions across different regions. Visitors can witness unique natural wonders, including the Midnight Sun in summer and the Northern Lights in winter, alongside rapid weather shifts year-round. This expert guide answers the key question: What should travelers expect from Iceland’s weather? It covers topics such as average temperatures, daylight hours, rainfall, wind patterns, top seasonal activities, essential safety tips, and practical travel advice. Whether you’re chasing the aurora borealis, exploring Iceland’s diverse landscapes, or heading into the Highlands, this up-to-date guide ensures you’re prepared for a safe and unforgettable Icelandic adventure.

• Temp = Avg High / Low
• NL = Northern Lights
• ✓ Accessible | ⚠️ Partial/variable | ❌ Closed

1. Iceland Weather in January

Overview
January is the peak of winter in Iceland, transforming the country into a stunning snowy paradise. Expect magical landwatscapes and unique experiences, but also challenging weather conditions for travelers.

Weather & Conditions
Temperatures in January typically range from -1°C to 1°C (30°F to 34°F), with just 4–5 hours of daylight. Frequent snowstorms, strong winds, and icy roads are common. The highlands are inaccessible, and many remote routes are closed for safety reasons.

Warnings
Travelers should be ready for sudden weather changes, including powerful winds and heavy snowfall. Driving can be hazardous due to ice, and road closures happen often, especially outside urban areas.

Best Activities & Highlights
January is one of the best months to see the Northern Lights thanks to long, dark nights and clear skies. Popular winter activities include glacier hiking, exploring ice caves, and relaxing in geothermal hot springs. Reykjavik and other cities offer a peaceful atmosphere with cozy cafes and fewer tourists.

Packing Tips
Pack insulated, waterproof clothing, sturdy boots with good traction, thermal layers, and winter accessories like hats, gloves, and scarves. Windproof outerwear and ice grips are essential for staying safe on slippery surfaces.

Regional Differences
Southern Iceland tends to be milder and rainier, while the North and Highlands are colder and snowier. Coastal regions can experience especially strong winds.

Travel Advice
Check weather and road updates daily, as closures are frequent. Guided tours are a safe way to explore. If driving, rent a 4x4 vehicle with winter tires. Allow extra time for travel and remain flexible with your plans.

Summary: Why Visit Iceland in January?
January in Iceland is ideal for Northern Lights hunting, unique winter activities, and experiencing serene, snow-covered landscapes. With careful preparation, it’s an unforgettable adventure for those eager to embrace Iceland’s winter magic.

2. Iceland Weather in Febraury

Weather Overview

• Average Temperature: -2°C to 2°C (28°F to 36°F)
• Daylight Hours: 7–8 hours
• Average Precipitation: Regular snowfall with occasional rain, leading to slippery and icy conditions.
• Typical Wind: February brings frequent winds, with sudden gusts and increased risk of snowstorms, especially in exposed areas.

February in Iceland is one of the best times to see the Northern Lights, thanks to long, dark nights and clear winter skies. Visitors can expect cold temperatures, frequent snow, and strong winds, making it essential to dress warmly and monitor weather conditions.

Highlands Accessibility

The Icelandic highlands are closed in February due to deep snow and harsh weather, so travel to these areas is not possible.

Best Activities & Highlights

• Northern Lights viewing is at its best, with optimal darkness and frequent aurora activity.
• Popular winter activities include ice caving, glacier hiking, snowmobiling, and soaking in geothermal pools.
• Experience local winter festivals and Icelandic culture.

Packing Tips

• Bring insulated, waterproof clothing, sturdy boots with good grip, thermal layers, and a windproof jacket.
• Crampons or ice grips are recommended for walking safely on icy surfaces.

Regional Differences

Southern Iceland may be slightly milder with more rain, while northern regions are colder and receive heavier snowfall.

Travel Advice

• Roads can be icy and hazardous; guided tours are recommended for safety.
• Regularly check road closures and weather updates before traveling.

In summary, February in Iceland offers a magical winter experience with prime Northern Lights viewing, dramatic snowy landscapes, and unique outdoor adventures. For the best trip, pack appropriately, stay informed about weather conditions, and consider guided tours for safety.

3. Iceland Weather in March

March is a transitional month, bridging the end of winter and the beginning of spring. Travelers can expect a mix of lingering snow and the first signs of thaw, making March weather in this region both unpredictable and exciting. This period is perfect for those seeking dynamic landscapes and a variety of seasonal experiences.

Weather Overview

• Average Temperature: -1°C to 3°C (30°F to 37°F)
• Daylight Hours: 10–12 hours
• Average Precipitation: March brings a combination of rain, snow, and occasional sleet.
• Typical Wind: Expect brisk winds and the potential for late winter storms, which can impact travel and outdoor activities.

Warnings

Late winter storms with sleet and snow may occur, affecting travel plans. Strong winds are frequent, so it’s important to monitor weather forecasts and be flexible with your itinerary.

Highlands Accessibility

Due to persistent snow and ice, the highlands remain inaccessible in March. Plan your activities in lower-lying or coastal areas where conditions are safer and more predictable.

Best Activities & Highlights

March is one of the last chances to see the Northern Lights. Thawing landscapes offer unique photo opportunities, and winter sports are still possible in accessible regions. Early spring festivals may also begin toward the end of the month, providing cultural highlights for visitors.

Packing Tips

Bring warm, waterproof layers, sturdy boots, and windproof outerwear. Prepare for both winter and early spring conditions, as temperatures and weather can shift rapidly throughout the month.

Regional Differences

Northern areas typically stay colder with more snow, while southern regions may see more rainfall and slightly higher temperatures.

Travel Advice

Road conditions can change quickly due to snow, sleet, or ice. Some tours and attractions may still be closed, so check availability in advance. If you are not experienced with local driving conditions, consider joining a guided tour for safety and convenience.

March’s unpredictable weather creates a memorable blend of winter’s last stand and the awakening of spring, making it an ideal time for adventurous travelers to experience the region’s dramatic natural beauty.

4. Iceland Weather in April

April signals the arrival of spring in Iceland, transforming the landscape with longer days and renewed natural beauty. Daylight stretches from 13 to 16 hours, giving travelers plenty of time to explore.

• Average Temperature: 0°C to 6°C (32°F to 43°F). While the air remains cool, you’ll notice the first hints of warmth and increased sunshine, marking the end of winter’s grip.
• Daylight Hours: 13–16 hours. Extended daylight is perfect for sightseeing, photography, and outdoor adventures.
• Average Precipitation: Moderate rainfall and occasional snow showers are common, especially early in April. Melting snow can cause flooding in low-lying areas, so stay alert if traveling in those regions.
• Typical Wind: April often brings breezy conditions, particularly in open and coastal areas. Storms are less frequent than in winter, but weather can change quickly.

Warnings: Flooding from melting snow may affect lowlands. Always check local weather updates and road conditions before heading out.

Highlands: Most highland routes remain closed due to snow and mud, with limited access until late April depending on weather.

Best Activities & Highlights: April’s blend of lingering snow and fresh growth creates stunning scenery for photographers. Enjoy scenic drives on the Ring Road, witness migratory birds returning, and experience Iceland’s top attractions before summer crowds arrive. Early April still offers a chance to see the Northern Lights.

Packing Tips: Pack layered clothing, waterproof outerwear, sturdy boots, gloves, and hats. Be prepared for both chilly and milder days, as Icelandic weather can shift rapidly.

Regional Differences: The north stays colder and snowier, while the south experiences more rain and earlier signs of spring. Coastal regions tend to be windier.

Travel Advice: Monitor road and weather conditions daily, especially outside urban areas. Some tours and attractions may have limited availability, but you’ll find popular sites less crowded. Renting a car is manageable, but watch for icy patches and muddy roads.

In summary, April in Iceland offers a unique blend of winter and spring, dramatic landscapes, and a sense of renewal. For travelers seeking adventure, natural beauty, and fewer tourists, April is an ideal and photogenic month to visit.

5. Iceland Weather in May

• Average Temperature: 4°C to 9°C (39°F to 48°F)
• Daylight Hours: 16–20 hours
• Average Precipitation: Expect a mix of rain and occasional showers.
• Typical Wind: May brings variable winds, with occasional strong gusts and sudden storms, especially in coastal regions.
  
  

What to Expect in May

May in Iceland signals the arrival of lush greenery and longer days, as the landscape comes alive after winter. With mild temperatures and up to 20 hours of daylight, this month is perfect for sightseeing, outdoor adventures, and photography. However, the weather can be unpredictable, so it’s wise to check forecasts and be prepared for quick changes.

Highlands Accessibility

The Icelandic highlands are partially accessible in May. Some roads open later in the month as snow melts, so always verify current road conditions before heading to remote areas.

Top Activities & Highlights

May is ideal for visiting Iceland’s iconic waterfalls, geothermal fields, and national parks with fewer crowds. Birdwatching—especially for puffins—and witnessing the vibrant spring bloom are popular. The soft light and dramatic scenery make it a fantastic time for photography.

Packing Tips

Pack layered clothing, a waterproof jacket, sturdy hiking boots, and windproof accessories. Be ready for rain, chilly winds, and rapidly changing weather.

Regional Differences

Northern Iceland is generally cooler, while southern regions receive more rainfall. Coastal areas can experience stronger winds, so plan accordingly.

Travel Advice

Renting a car is a convenient way to explore Iceland in May, but always check road and weather conditions, especially if traveling into the highlands. Some tours and attractions may have limited availability compared to the summer peak.

In summary, May is an excellent month to visit Iceland for nature lovers and adventurers. You’ll enjoy extended daylight, awakening landscapes, and fewer tourists, making it a prime time to experience the country’s natural wonders.

6. Iceland Weather in June

Weather Overview

• Average Temperature: 7°C to 12°C (45°F to 54°F)
• Daylight Hours: Up to 24 hours of daylight
• Average Precipitation: June is generally dry, but light rain showers are possible.
• Typical Wind: While severe weather is rare, brisk winds can occur, especially in open or coastal areas. Always exercise caution during outdoor activities.
  
  

Daylight & Activities
With the Midnight Sun, Iceland enjoys 24 hours of daylight in June, allowing for uninterrupted road trips, hiking, and sightseeing. This is the perfect month to visit waterfalls, black sand beaches, and other natural wonders at any time of day.

Highlands Accessibility
By mid to late June, the Icelandic Highlands usually become accessible, revealing remote landscapes for adventurous travelers. However, always check local conditions before visiting, as snow and rainfall can affect road openings.

Packing Tips
Bring layers to adjust to changing temperatures, and pack windproof clothing for comfort during outdoor adventures. Sunglasses and a sleep mask are essential due to the constant daylight.

Regional Differences
All regions experience extended daylight, but the North tends to be cooler and some highland roads may open later than those in the South.

Travel Advice
June offers excellent driving conditions, but stay updated on weather forecasts for sudden wind changes. Many tours run around the clock, so book early to secure spots during this busy travel season.

June’s Unique Flavor
June in Iceland is vibrant and festive, with locals and visitors celebrating the endless days. Outdoor festivals, blooming wildflowers, and the magical glow of the Midnight Sun create a truly unforgettable experience for travelers seeking the best time to visit Iceland in summer.

7. Iceland Weather in July

Overview
July is Iceland’s warmest and brightest month, marking the height of summer. With average temperatures ranging from 9°C to 15°C (48°F to 59°F), visitors can enjoy long, sunny days and breathtaking landscapes at their most vibrant.

Daylight Hours
Experience nearly endless daylight, with 20 to 22 hours of sun each day. This extended daylight provides ample time to explore and take in Iceland’s natural wonders.

Weather Conditions & Warnings
While July generally offers mild weather, be prepared for occasional heavy rain and coastal fog. Winds are typically gentle, but sudden storms can occur, especially near the coast. Always check local forecasts and pack accordingly.

Highland Accessibility
The Highlands are usually fully accessible in July, opening up opportunities for adventurous travelers to explore remote areas, hike scenic trails, and discover hidden gems.

Best Activities & Highlights
July is perfect for visiting glacier lagoons, majestic waterfalls, and the remote Highlands. It’s also an excellent time for hiking, birdwatching, and joining local festivals. Wildlife enthusiasts can spot puffins along the cliffs and enjoy whale watching tours.

Packing Tips
Pack layered clothing, waterproof jackets, sturdy hiking boots, and sun protection. Even in summer, Iceland’s weather can change rapidly, so be ready for both sunshine and showers.

Regional Differences
The North tends to be slightly cooler, while the South may experience more rain and fog. Coastal areas are prone to mist, especially in the mornings.

Travel Advice
Roads are generally in excellent condition, making self-driving and guided tours popular options. However, always check for road closures or weather advisories before venturing into the Highlands or remote areas.

July brings Iceland alive with color, energy, and endless daylight. It’s the perfect month for adventure, discovery, and soaking in the country’s unique natural beauty.

8. Iceland Weather in August

Weather Overview

• Average Temperature: 8°C to 14°C (46°F to 57°F)
• Daylight Hours: 16–18 hours
• Average Precipitation: Expect frequent rain showers and occasional localized flooding, especially in the south.
• Typical Wind: Winds are generally mild, but sudden gusts and weather changes can occur.

Overview

August marks the end of summer in Iceland, offering visitors the warmest weather of the year and the longest daylight hours. This makes it the perfect time for outdoor adventures, from hiking Iceland’s Highlands to scenic drives around the Ring Road. The landscape is at its greenest and most vibrant, with wildflowers in bloom and wildlife active.

Highlands Accessibility

The Icelandic Highlands are usually fully open in August, providing excellent conditions for hiking, off-road exploration, and discovering remote natural wonders.

Best Activities & Highlights

August is ideal for puffin-watching, exploring waterfalls, and joining local festivals and cultural events. The extended daylight hours let you make the most of each day’s adventures.

Packing Tips

Pack waterproof clothing, sturdy hiking boots, and layers to adapt to Iceland’s unpredictable weather. Don’t forget a camera to capture the stunning landscapes and abundant wildlife.

Regional Differences

The north of Iceland is typically a bit cooler, while the south may see more rainfall. Always check the latest local weather forecasts before heading out.

Travel Advice

Road conditions are generally good, but be cautious of slippery roads and flooding in low-lying areas after heavy rain. Book your tours and accommodations early, as August is a peak month for tourism in Iceland.

August Flavor

With lush scenery, lively festivals, and long summer days, August is one of the best times to experience both Iceland’s natural beauty and its vibrant cultural scene before the arrival of autumn.

9. Iceland Weather in September

Overview: September in Iceland is a spectacular time for travelers, offering vibrant autumn foliage and the return of the Northern Lights. As summer fades to fall, visitors can enjoy striking landscapes, unique cultural events, and optimal conditions for aurora viewing, making it an ideal month for those seeking memorable experiences and natural beauty.

Weather Overview

• Average Temperature: 5°C to 10°C (41°F to 50°F). Days are cool and crisp, perfect for outdoor adventures without the harsh cold of winter.
• Daylight Hours: 12–14 hours of daylight allow plenty of time for sightseeing and outdoor activities.
• Average Precipitation: Rainfall increases in September, so expect wet conditions, especially in the lowlands. Pack waterproof gear to stay comfortable.
• Typical Wind: September brings more frequent storms, with strong winds and occasional heavy rain. Be ready for fast-changing weather patterns, especially during storms.

Warnings

Storms become more common in September, bringing strong winds and rain. Always check the latest weather forecasts and road conditions before heading out, especially in rural or highland areas.

Highlands Accessibility

The Highlands often close by late September due to worsening weather and road conditions. If you plan to visit the Highlands, do so early in the month and monitor closures closely.

Best Activities & Highlights

• Experience the Northern Lights as longer nights boost visibility.
• Admire the vibrant autumn colors across Iceland’s countryside.
• Explore waterfalls, hot springs, and scenic drives at their most picturesque.
• Join local harvest festivals and cultural events for authentic Icelandic experiences.

Packing Tips

• Bring waterproof outerwear and sturdy boots for wet, windy days.
• Pack warm layers for chilly mornings and evenings.
• Don’t forget hats, gloves, and scarves for extra warmth outdoors.

Regional Differences

Southern Iceland is typically wetter, while northern regions tend to be cooler. Weather can change quickly, so flexibility in your plans is essential.

Travel Advice

• Monitor weather and road closures, especially if heading to the Highlands.
• Consider guided tours for safe and informative exploration.
• Book your accommodations and car rentals early, as September remains a popular month for visitors.

September in Iceland offers golden landscapes, the first glimpses of the aurora borealis, and a blend of adventure and culture. Whether you’re chasing the Northern Lights or savoring the last highland excursions, this month delivers unforgettable memories and stunning scenery.

10. Iceland Weather in October

October in Iceland is perfect for travelers seeking a peaceful getaway, fewer tourists, and breathtaking autumn scenery. Here’s a comprehensive guide to help you plan your trip, covering weather conditions, travel tips, and the best things to do in Iceland in October.

Weather Overview

• Average Temperature: 2°C to 7°C (36°F to 45°F)
• Daylight Hours: 8–10 hours
• Average Precipitation: Frequent rain and sleet are expected as autumn storms become more common.
• Typical Wind: October is known for strong, blustery winds and occasional storms, so travelers should be prepared for rapidly changing weather.
  
  

Warnings

Autumn storms with rain and sleet are frequent. Sudden weather changes can impact travel, so always check local weather forecasts and road conditions before heading out.

Highlands Accessibility

Most highland areas are closed in October due to snow, making travel unsafe or restricted.

Best Activities & Highlights

• Relax in geothermal hot springs, a must-do in Iceland’s cool autumn weather.
• Capture the beauty of quiet, uncrowded landscapes—ideal for photographers.
• Experience the Northern Lights, with long, dark nights offering excellent viewing opportunities.

Packing Tips

Pack warm, waterproof layers, sturdy boots, windproof jackets, and accessories like hats and gloves to stay comfortable in unpredictable weather.

Regional Differences

Northern Iceland is typically colder with a higher chance of snow, while southern areas tend to be wetter. Always check regional forecasts before traveling.

Travel Advice

Driving conditions can be difficult due to wet, icy, or stormy roads. If you’re not familiar with Icelandic weather, consider booking guided tours. Some attractions and roads may close without notice, so stay updated before your trip.

In summary, October in Iceland offers a unique combination of dramatic autumn weather, serene landscapes, and fantastic chances to see the Northern Lights, making it a top choice for a quiet and memorable adventure.

11. Iceland Weather in November

November in Iceland signals the true arrival of winter, with early snowfalls, shorter daylight hours, and the chance to witness the country’s unique seasonal beauty. Visitors can expect chilly weather, frequent precipitation, and dynamic conditions that set the stage for memorable adventures and natural phenomena.

Weather Overview

• Average Temperature: 0°C to 4°C (32°F to 39°F)
• Daylight Hours: 5–7 hours
• Average Precipitation: Frequent rain and snow showers make surfaces slippery; icy conditions are common.
• Typical Wind: November features strong winds and the potential for early winter storms, leading to unpredictable weather patterns.
  
  

Warnings

Expect early winter storms and icy roads throughout November. Wind and precipitation often create hazardous driving conditions, especially outside urban areas.

Highlands Accessibility

The Icelandic highlands are completely closed off due to heavy snow and ice, with all mountain roads shut for the season.

Best Activities & Highlights

• November is one of the best months for Northern Lights in Iceland, thanks to long nights and frequent clear skies.
• Capture stunning winter photography, featuring snowy vistas and dramatic lighting.
• Enjoy relaxing in hot springs and geothermal spas—especially appealing in the brisk November air.
• Look for local cultural events and festivals in towns and cities during this early winter period.

Packing Tips

• Pack warm, waterproof clothing: thermal layers, insulated jackets, gloves, hats, and scarves are essential.
• Wear sturdy, waterproof boots to navigate wet and icy ground.
• Bring reflective gear or accessories for extra safety in limited daylight.

Regional Differences

Northern and inland regions are generally colder and snowier, while southern and coastal areas tend to have more rain and slightly milder temperatures.

Travel Advice

• Driving in November can be hazardous due to ice and sudden storms—always check weather and road conditions before traveling.
• Most interior and highland roads are closed; stick to main routes and consider guided tours for safety.
• Some attractions may have limited hours or accessibility, so plan ahead.

In summary, November in Iceland offers a magical early winter experience, with crisp air, fresh snow, and spectacular aurora displays. With the right preparation, travelers can explore Iceland’s highlights safely and comfortably, making the most of this enchanting season.

12. Iceland Weather in December

Weather Overview

• Average Temperature: -2°C to 3°C (28°F to 37°F)
• Daylight Hours: 4–5 hours
• Average Precipitation: Frequent snow and occasional rain create slippery conditions, so expect wintry mixes throughout the month.
• Typical Wind: December brings strong winds and occasional storms, adding to the winter atmosphere and sometimes impacting travel.
  
  

What to Expect in December
December in Iceland is a magical time, with the landscape transformed by snow and festive lights. The country comes alive with Icelandic holiday traditions and cozy celebrations, making it ideal for experiencing the true spirit of winter in Iceland.

Travel Conditions & Warnings

Travelers should be prepared for challenging weather, including snow and ice storms that can cause road closures—especially in remote areas. The Highlands are inaccessible during winter. Always check weather and road updates before setting out.

Best Things to Do in December

Enjoy Iceland’s Christmas markets, soak in geothermal pools, and chase the Northern Lights. The snowy scenery is perfect for winter sports and photography enthusiasts.

Packing Tips

Pack warm, layered clothing, waterproof outerwear, insulated boots, gloves, hats, scarves, and ice grips or crampons for safety on icy surfaces.

Regional Weather Differences

Southern Iceland is typically rainier, while the north is colder and snowier. Coastal regions tend to be windier than inland areas.

Travel Advice

Plan your activities around the limited daylight. Book tours, especially Northern Lights excursions, in advance. If driving, be cautious—roads are often icy and conditions can change quickly. Many rural and highland roads are closed in December.

Visiting Iceland in December offers a unique blend of festive cheer, breathtaking winter landscapes, and unforgettable adventures. With proper preparation for the weather and daylight hours, you can make the most of your Icelandic winter holiday.

Overview of Iceland's Weather Regions

Iceland’s weather varies greatly by region, directly impacting travel plans and local experiences. The Reykjavik area and South Coast enjoy milder winters and cooler summers, making them accessible and attractive to visitors all year. North Iceland sees colder temperatures and frequent snowfall, while the East and Westfjords are known for dramatic weather changes and higher precipitation. The Highlands, Iceland’s interior, are the coldest and most remote, featuring unpredictable weather and limited access.

Impact on Travel, Temperatures, and Precipitation

Regional weather differences in Iceland affect road conditions and travel safety. Reykjavik and the South Coast are usually open year-round, ideal for tourists seeking reliable access. In contrast, North Iceland, the East, and Westfjords often face road closures from heavy snow or storms, particularly in winter. The Highlands are generally open only in summer, and sudden weather changes are common, so travelers must come prepared. Knowing these regional weather patterns helps visitors plan safer, more enjoyable trips and ensures readiness for Iceland’s unique climate conditions.

The Midnight Sun

The Midnight Sun in Iceland is a natural event where the sun stays visible even at midnight, mainly from late May to early August. This creates nearly 24 hours of daylight, allowing visitors to enjoy sightseeing and outdoor activities at any hour. For a restful sleep despite the constant light, travelers should pack sleep masks or use blackout curtains.

Northern Lights Season

The best time to see the Northern Lights (Aurora Borealis) in Iceland is from late September to early April, with peak visibility between October and March when nights are longest. For the best chance to witness this spectacular phenomenon, choose nights with clear, dark skies away from city lights. Guided tours and checking the aurora forecast can improve your chances, but remember that seeing the Northern Lights depends on both weather and solar activity—patience is essential.

Wind Warnings

Iceland frequently experiences strong, unpredictable winds that can affect travel plans. Always stay updated with local wind warnings, which use a color-coded system: yellow (be aware), orange (hazardous conditions), and red (severe weather—avoid travel). Understanding these warnings and regularly checking weather updates is crucial for safe travel in Iceland.

Wondering how to stay safe and enjoy your trip to Iceland despite the unpredictable weather? Iceland’s ever-changing weather is part of what makes the country unique. To ensure a safe and unforgettable adventure, always check the latest Iceland weather forecast, pack clothing for all seasons, and plan your itinerary with flexibility. For expert advice on driving in Iceland, what to pack, and the best times to visit, explore our in-depth guides. With the right preparation, you can experience Iceland’s natural wonders safely and comfortably, no matter the weather.

• Monitor Weather and Road Conditions: Check vedur.is for weather updates and road.is for road conditions.
• Choose the Right Vehicle: Renting a reliable car is essential, especially in winter.
• Pack Smart: Always have layers, emergency supplies, and waterproof gear.
• Plan for Flexibility: Weather can change rapidly, so be prepared to adjust your plans.
• Read the complete guide to driving in Iceland during winter.