Climate · Karuizawa

Karuizawa in December

Chilly and mostly dry, as the days hold steady.

Typical weather, averaged over 30 years

December in Karuizawa is chilly: highs near 44°F, lows near 27°F. Rain or snow falls on about two days a week, and daylight holds at about 9 hours 43 minutes.December in Karuizawa is chilly: highs near 7°C, lows near -3°C. Rain or snow falls on about two days a week, and daylight holds at about 9 hours 43 minutes.

High
44°F7°Caverage
Low
27°F-3°Caverage
Wet days
2a week · 29% of days
Daylight
9h 43mon average

Is December a good time to visit Karuizawa?


December sits outside Karuizawa's best months, which run from June to September. Expect chilly days and rain or snow on about two days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How December sits in the year

week by week

Temperature

Highs near 44°F in December, against 38°F to 82°F through the year.Highs near 7°C in December, against 3°C to 28°C through the year.

Chance of a wet day

29% of days in December, against 29% to 80% through the year.

Cloud cover

56% cover in December, against 56% to 73% through the year.

Daylight

9h 43m in December, against 9h 43m to 14h 36m through the year.

Week by week, lightly smoothed, with December shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side


  1. November55°13°low 37°low 3°2 wet days a weekRain on about two days a week.
  2. December44°7°low 27°low -3°2 wet days a weekRain on about two days a week.
  3. January38°3°low 21°low -6°2 wet days a weekRain on about two days a week.

Where Karuizawa sits, in December

Asia/Tokyo

this place
typical high in December 40°F4°C95°F35°C
Sunrise, mid-December
6:50 AMsets 4:32 PM
Above the sea
900 mupland
Latitude
36.3°Nnorthern hemisphere
Nearest of ours
Nozawa Onsen65 km north

The land around Karuizawa, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Japan in December

high · low · wet days

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Karuizawa. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.