SeasonMapKaruizawa weather in December
Japan
December in Karuizawa: cold, a little rain, with clean air — a fair time to visit.
#10 of 12 months in Karuizawa · #987 of 1383 destinations to visit in December · comfort 58/100 (tier D)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Karuizawa in December
Other months in Karuizawa
Karuizawa's forum calls May one of the most pleasant months — its elevation keeps it noticeably cooler than Tokyo, with a day-to-night temperature swing of around 10°C that catches some visitors out. Regulars recommend layers for exactly that reason, plus a rain jacket just in case, and flag the first week of May (Golden Week) as considerably busier than the rest of the month.
Add your own note from Karuizawa's card on the map.
Karuizawa climate normals — December
| Daytime high | 6°C / 42°F | 🧥 cold |
|---|---|---|
| Nighttime low | -6°C / 21°F | |
| Feels like (high) | 1°C / 34°F | |
| Rainfall | 48 mm / 1.9 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 72% | 💧 humid |
| Dew point | -4°C / 26°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 9.7 h | |
| Wind | 12 km/h / 8 mph | |
| Snowfall | 9.3 cm / 3.7 in | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Karuizawa in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyWinter break (fuyuyasumi) in Japan, school holidays in 4 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Karuizawa's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherKaruizawa's best weather comes in May, June and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Karuizawa in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Opening
First lifts in Japan
1 Nov – 31 MarSki seasonThe Prince resort makes snow in cold, dry air and usually opens on 1 November, weeks before anywhere else in Nagano has any. Short, groomed runs and a Tokyo day-trip crowd. Source ↗
Nearby, and something's on
Within 300 km of Karuizawa — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Karuizawa?
Karuizawa in December — FAQ
- Is December a good time to visit Karuizawa?
- December in Karuizawa: cold, a little rain, with clean air — a fair time to visit. It ranks #10 of 12 months for Karuizawa on SeasonMap's comfort score (58/100).
- What is the weather like in Karuizawa in December?
- In December, Karuizawa averages a daily high of 5.8°C and a low of -6°C, with about 47.9 mm of rain over roughly 7.6 rainy days.
- What is the air quality in Karuizawa in December?
- Karuizawa has a mean US Air Quality Index of about 32 in December.
- Does it snow in Karuizawa in December?
- Karuizawa sees roughly 9.3 cm of snowfall in December.
Other months in Karuizawa
Compare Karuizawa in December
Warmer or cooler than Karuizawa in December
Similar destinations in East Asia — December
Within 300 km: Tokyo's Autumn colour around 15 Nov – 10 Dec, and Kyoto's Autumn colour around 10 Nov – 5 Dec.