Climate averages 1991–2020
Ama weather
in December.
A cool, moderately wet month: the 10th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Ama: daytime highs average 10.4°C and nights cool to about 1.8°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 65 mm of rain on roughly 7 days, which makes December a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 50 min on an average December day.
The nearest other city in this atlas is Nagoya (10 km away). In December its highs average 10.4°C, about as warm as Ama, with 55 mm of rain.
Among the 303 cities listed in Japan, Ama ranks joint 134th of 303 for the warmest December highs and joint 126th of 303 for the driest December (rainfall, lowest first). The mean December high of those 303 cities is 9.5°C; Ama is 0.9°C warmer than that mean.
From December to January, average highs fall by 2.4°C to 8.1°C, and monthly rainfall falls from 65 mm to 63 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
Ama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.1°C-0.6°C | -0.6°C | 63 | 6.9 | 10.110 h |
| February | 9.2°C-0.5°C | -0.5°C | 70 | 7.3 | 10.911 h |
| March | 13.0°C2.4°C | 2.4°C | 127 | 10.7 | 11.912 h |
| April | 18.1°C7.5°C | 7.5°C | 147 | 11.2 | 13.113 h |
| May | 22.6°C12.8°C | 12.8°C | 176 | 11.9 | 14.014 h |
| June | 25.8°C17.9°C | 17.9°C | 222 | 15.1 | 14.514 h |
| July | 29.2°C22.2°C | 22.2°C | 276 | 18.4 | 14.314 h |
| August | 30.6°C23.3°C | 23.3°C | 181 | 15.4 | 13.513 h |
| September | 27.0°C19.6°C | 19.6°C | 248 | 14.0 | 12.412 h |
| October | 21.5°C13.2°C | 13.2°C | 192 | 11.3 | 11.311 h |
| November | 15.8°C7.0°C | 7.0°C | 99 | 7.6 | 10.410 h |
| December, selected | 10.4°C1.8°C | 1.8°C | 65 | 6.8 | 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
- Nagoya in DecemberJapan · 10 kmHigh 10.4°C · Low 1.4°C · 55 mm rain
- Ichinomiya in DecemberJapan · 13 kmHigh 10.1°C · Low 1.3°C · 65 mm rain
- Komaki in DecemberJapan · 15 kmHigh 10.2°C · Low 0.9°C · 55 mm rain
- Kasugai in DecemberJapan · 17 kmHigh 10.7°C · Low 1.2°C · 55 mm rain
- Kuwana in DecemberJapan · 19 kmHigh 10.6°C · Low 1.9°C · 59 mm rain
- Tōkai in DecemberJapan · 20 kmHigh 10.7°C · Low 2.3°C · 56 mm rain
- Ōgaki in DecemberJapan · 25 kmHigh 10.0°C · Low 1.7°C · 70 mm rain
- Kakamigahara in DecemberJapan · 27 kmHigh 9.7°C · Low 0.6°C · 86 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 Ama) is explained once on the Ama year overview and on the Sources, method and limits page.
Ichinomiya lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.