Climate averages 1991–2020
Yamaguchi 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 Yamaguchi: daytime highs average 10.0°C and nights cool to about 3.6°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 64 mm of rain on roughly 10 days, which makes December a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 55 min on an average December day.
The nearest other city in this atlas is Hōfu (17 km away). In December its highs average 10.9°C, 0.9°C warmer than Yamaguchi, with 68 mm of rain.
Among the 303 cities listed in Japan, Yamaguchi ranks joint 179th of 303 for the warmest December highs and joint 121st of 303 for the driest December (rainfall, lowest first). The mean December high of those 303 cities is 9.5°C; Yamaguchi is 0.6°C warmer than that mean.
From December to January, average highs fall by 2.4°C to 7.7°C, and monthly rainfall falls from 64 mm to 61 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
Yamaguchi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.7°C1.5°C | 1.5°C | 61 | 9.7 | 10.210 h |
| February | 9.0°C1.6°C | 1.6°C | 72 | 10.0 | 10.911 h |
| March | 12.7°C4.0°C | 4.0°C | 117 | 11.4 | 11.912 h |
| April | 17.9°C8.4°C | 8.4°C | 130 | 10.6 | 13.013 h |
| May | 22.4°C13.2°C | 13.2°C | 150 | 10.5 | 13.914 h |
| June | 25.6°C17.9°C | 17.9°C | 248 | 14.3 | 14.414 h |
| July | 28.8°C22.3°C | 22.3°C | 283 | 16.3 | 14.214 h |
| August | 30.2°C23.4°C | 23.4°C | 167 | 14.2 | 13.413 h |
| September | 26.7°C19.6°C | 19.6°C | 178 | 12.4 | 12.412 h |
| October | 21.6°C13.7°C | 13.7°C | 97 | 8.1 | 11.411 h |
| November | 15.7°C8.3°C | 8.3°C | 78 | 8.2 | 10.410 h |
| December, selected | 10.0°C3.6°C | 3.6°C | 64 | 9.7 | 9.910 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
- Hōfu in DecemberJapan · 17 kmHigh 10.9°C · Low 5.0°C · 68 mm rain
- Ube in DecemberJapan · 33 kmHigh 10.9°C · Low 6.5°C · 74 mm rain
- Shūnan in DecemberJapan · 35 kmHigh 8.9°C · Low 3.0°C · 69 mm rain
- Yukuhashi in DecemberJapan · 67 kmHigh 10.9°C · Low 4.7°C · 68 mm rain
- Kitakyushu in DecemberJapan · 68 kmHigh 10.7°C · Low 5.5°C · 61 mm rain
- Iwakuni in DecemberJapan · 69 kmHigh 10.8°C · Low 5.1°C · 60 mm rain
- Nakatsu in DecemberJapan · 70 kmHigh 11.0°C · Low 4.7°C · 61 mm rain
- Hatsukaichi in DecemberJapan · 82 kmHigh 10.6°C · Low 4.0°C · 60 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 Yamaguchi) is explained once on the Yamaguchi year overview and on the Sources, method and limits page.