Climate averages 1991–2020
Kai weather
in December.
A cool, moderately wet month: the 10th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Kai: daytime highs average 8.9°C and nights cool to about 1.2°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 60 mm of rain on roughly 7 days, which makes December a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 9 h 48 min on an average December day.
The nearest other city in this atlas is Kofu (6 km away). In December its highs average 9.6°C, 0.7°C warmer than Kai, with 60 mm of rain.
Among the 303 cities listed in Japan, Kai ranks joint 235th of 303 for the warmest December highs and joint 73rd of 303 for the driest December (rainfall, lowest first). The mean December high of those 303 cities is 9.5°C; Kai is 0.6°C cooler than that mean.
From December to January, average highs fall by 3.1°C to 5.8°C, and monthly rainfall rises from 60 mm to 65 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Kai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.8°C-2.4°C | -2.4°C | 65 | 6.8 | 10.010 h |
| February | 6.9°C-2.2°C | -2.2°C | 73 | 8.1 | 10.911 h |
| March | 11.0°C1.4°C | 1.4°C | 125 | 12.8 | 11.912 h |
| April | 17.4°C7.0°C | 7.0°C | 120 | 12.6 | 13.113 h |
| May | 22.2°C12.3°C | 12.3°C | 129 | 12.8 | 14.014 h |
| June | 24.9°C16.7°C | 16.7°C | 177 | 16.3 | 14.515 h |
| July | 28.3°C20.6°C | 20.6°C | 199 | 17.4 | 14.314 h |
| August | 29.1°C21.5°C | 21.5°C | 139 | 16.8 | 13.514 h |
| September | 25.3°C17.8°C | 17.8°C | 185 | 14.6 | 12.412 h |
| October | 19.8°C11.9°C | 11.9°C | 186 | 13.0 | 11.311 h |
| November | 14.6°C6.3°C | 6.3°C | 85 | 9.2 | 10.310 h |
| December, selected | 8.9°C1.2°C | 1.2°C | 60 | 7.4 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Kofu in DecemberJapan · 6 kmHigh 9.6°C · Low 1.4°C · 60 mm rain
- Minami-Alps in DecemberJapan · 9 kmHigh 9.3°C · Low 1.4°C · 80 mm rain
- Fujinomiya in DecemberJapan · 53 kmHigh 11.2°C · Low 3.9°C · 107 mm rain
- Gotemba in DecemberJapan · 57 kmHigh 9.4°C · Low 1.8°C · 90 mm rain
- Saku in DecemberJapan · 59 kmHigh 6.9°C · Low -1.1°C · 48 mm rain
- Fuji, Japan in DecemberJapan · 60 kmHigh 12.1°C · Low 5.0°C · 101 mm rain
- Iida in DecemberJapan · 65 kmHigh 7.3°C · Low -0.7°C · 100 mm rain
- Akiruno in DecemberJapan · 65 kmHigh 10.4°C · Low 1.7°C · 68 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Kai) is explained once on the Kai year overview and on the Sources, method and limits page.
Kofu lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.