Karuizawa Weather in December
December in Karuizawa sees daytime temperatures around 7°C (45°F) and lows of -2°C (28°F) at night. As the driest month of the year.
Rainfall in Karuizawa in December
This month is a reliable choice for exploring, with the driest conditions of the year, even if you'll need to dress for cooler weather. This month experiences about 15 days of snow/rain according to historical data, averaging 63 mm (2.5 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Karuizawa in December
December in Karuizawa sees highs of 7°C (45°F) and lows of -2°C (28°F) overnight. December is part of the winter season. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. At -2°C (28°F) overnight, frost and ice are likely outside. Indoors, consider packing an extra blanket if you're unsure about the heating.
Sunshine in Karuizawa in December
The area enjoys a moderate level of sunlight, with around 137 hours. It's a good balance between sunny and cloudy days.December in Karuizawa has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Karuizawa's climate page.
Karuizawa Temperature in December
Min Temperature
-2°C (28°F)
Max Temperature
7°C (45°F)
Chance of Rain
48%
Precipitation
63 mm (2.5 in)
Rainy days
15 days
Humidity
77% *
Sunshine
137 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Karuizawa typically drop from around 9°C (48°F) at the start of December to approximately 5°C (41°F) by the end. Nights are very cold, with lows typically ranging from -5°C (23°F) to 0°C (32°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Karuizawa in December
Browse day-by-day weather records for Karuizawa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Karuizawa historical weather extremes in December
Our historical data for Karuizawa spans 1976 to 2025, revealing these weather extremes.
- The hottest December day on record in Karuizawa reached 22°C (72°F) (December 1, 1990).
- The lowest daytime temperature in December was -5°C (23°F), recorded on December 25, 1995.
- The lowest overnight temperature recorded in December was -15°C (5°F) (December 28, 1995).
- The wettest December day on record brought 41 mm (1.6 in) of precipitation to Karuizawa (December 27, 2006).
Best Places in Japan in December
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in December →
perfect weather
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unpleasant
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What to Wear in Karuizawa in December
Dress warmly and in layers for your trip to Karuizawa in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Wet weather is likely, so pack waterproof gear for multiple rainy days. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Karuizawa in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Karuizawa's climate page.
Temperature Rainfall Sunshine Humidity
See the full Karuizawa climate overview or explore weather in Japan.
