Climate averages 1991–2020
Izumo weather
in December.
A cool, wet month: the 10th warmest and the joint 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Izumo: daytime highs average 10.2°C and nights cool to about 6.0°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 103 mm of rain on roughly 16 days, which makes December a wet month (the joint 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 49 min on an average December day.
The nearest other city in this atlas is Matsue (29 km away). In December its highs average 10.4°C, about as warm as Izumo, with 182 mm of rain.
Among the 303 cities listed in Japan, Izumo ranks joint 154th of 303 for the warmest December highs and 265th of 303 for the driest December (rainfall, lowest first). The mean December high of those 303 cities is 9.5°C; Izumo is 0.7°C warmer than that mean.
From December to January, average highs fall by 2.6°C to 7.5°C, and monthly rainfall falls from 103 mm to 96 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
Izumo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.5°C3.5°C | 3.5°C | 96 | 17.3 | 10.110 h |
| February | 8.2°C3.4°C | 3.4°C | 89 | 14.7 | 10.911 h |
| March | 11.3°C5.6°C | 5.6°C | 116 | 14.1 | 11.912 h |
| April | 16.0°C9.7°C | 9.7°C | 104 | 10.7 | 13.113 h |
| May | 20.3°C14.3°C | 14.3°C | 117 | 10.5 | 14.014 h |
| June | 23.7°C18.7°C | 18.7°C | 160 | 12.7 | 14.515 h |
| July | 27.2°C23.2°C | 23.2°C | 213 | 15.2 | 14.314 h |
| August | 28.7°C24.6°C | 24.6°C | 149 | 13.8 | 13.513 h |
| September | 25.0°C20.9°C | 20.9°C | 190 | 13.6 | 12.412 h |
| October | 20.2°C15.8°C | 15.8°C | 103 | 10.3 | 11.311 h |
| November | 15.3°C10.7°C | 10.7°C | 87 | 11.1 | 10.310 h |
| December, selected | 10.2°C6.0°C | 6.0°C | 103 | 16.3 | 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
- Matsue in DecemberJapan · 29 kmHigh 10.4°C · Low 6.7°C · 182 mm rain
- Yonago in DecemberJapan · 52 kmHigh 9.9°C · Low 5.0°C · 198 mm rain
- Higashihiroshima in DecemberJapan · 107 kmHigh 9.7°C · Low 2.6°C · 53 mm rain
- Mihara in DecemberJapan · 111 kmHigh 10.9°C · Low 3.6°C · 50 mm rain
- Hiroshima in DecemberJapan · 111 kmHigh 10.3°C · Low 3.4°C · 64 mm rain
- Fukuyama in DecemberJapan · 112 kmHigh 11.3°C · Low 4.2°C · 47 mm rain
- Onomichi in DecemberJapan · 113 kmHigh 10.7°C · Low 3.8°C · 47 mm rain
- Tsuyama in DecemberJapan · 117 kmHigh 9.9°C · Low 1.9°C · 52 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 Izumo) is explained once on the Izumo year overview and on the Sources, method and limits page.