Climate averages 1991–2020
Aira weather
in January.
A cool, moderately wet month: the coolest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Aira: daytime highs average 10.5°C and nights cool to about 3.8°C. By daytime temperature it is the coolest month of the year.
Expect about 81 mm of rain on roughly 10 days, which makes January a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 10 h 19 min on an average January day.
The nearest other city in this atlas is Kirishima (17 km away). In January its highs average 11.2°C, 0.7°C warmer than Aira, with 80 mm of rain.
Among the 303 cities listed in Japan, Aira ranks 11th of 303 for the warmest January highs and joint 231st of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Aira is 3.5°C warmer than that mean.
From January to February, average highs rise by 1.3°C to 11.8°C, and monthly rainfall rises from 81 mm to 106 mm.
The annual picture
January 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
Aira climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 10.5°C3.8°C | 3.8°C | 81 | 9.6 | 10.310 h |
| February | 11.8°C4.2°C | 4.2°C | 106 | 9.8 | 11.011 h |
| March | 15.1°C6.8°C | 6.8°C | 153 | 12.9 | 12.012 h |
| April | 19.5°C10.8°C | 10.8°C | 182 | 11.5 | 12.913 h |
| May | 23.5°C15.3°C | 15.3°C | 205 | 11.7 | 13.814 h |
| June | 25.8°C19.6°C | 19.6°C | 514 | 19.4 | 14.214 h |
| July | 29.4°C23.6°C | 23.6°C | 336 | 20.0 | 14.014 h |
| August | 30.3°C24.2°C | 24.2°C | 173 | 17.4 | 13.313 h |
| September | 28.0°C21.5°C | 21.5°C | 197 | 14.5 | 12.412 h |
| October | 23.5°C16.2°C | 16.2°C | 108 | 8.6 | 11.411 h |
| November | 18.1°C10.7°C | 10.7°C | 111 | 8.7 | 10.611 h |
| December | 12.7°C5.8°C | 5.8°C | 87 | 7.9 | 10.110 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
January in nearby cities
- Kirishima in JanuaryJapan · 17 kmHigh 11.2°C · Low 3.1°C · 80 mm rain
- Kagoshima in JanuaryJapan · 23 kmHigh 11.3°C · Low 5.9°C · 82 mm rain
- Sendai, Japan in JanuaryJapan · 28 kmHigh 11.1°C · Low 6.8°C · 98 mm rain
- Miyakonojō in JanuaryJapan · 45 kmHigh 11.0°C · Low 2.9°C · 81 mm rain
- Kanoya in JanuaryJapan · 50 kmHigh 11.6°C · Low 5.0°C · 81 mm rain
- Miyazaki in JanuaryJapan · 79 kmHigh 11.6°C · Low 5.3°C · 78 mm rain
- Honmachi in JanuaryJapan · 81 kmHigh 9.6°C · Low 3.2°C · 73 mm rain
- Amakusa in JanuaryJapan · 85 kmHigh 10.3°C · Low 5.4°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 Aira) is explained once on the Aira year overview and on the Sources, method and limits page.