Climate averages 1991–2020
Jōetsu weather
in January.
A cold, very wet month: the coolest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Jōetsu: daytime highs average 4.1°C and nights cool to about -1.1°C. By daytime temperature it is the coolest month of the year.
Expect about 254 mm of rain on roughly 26 days, which makes January a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 9 h 55 min on an average January day.
The nearest other city in this atlas is Kashiwazaki (37 km away). In January its highs average 4.1°C, about as warm as Jōetsu, with 216 mm of rain.
Among the 303 cities listed in Japan, Jōetsu ranks joint 252nd of 303 for the warmest January highs and 302nd of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Jōetsu is 2.8°C cooler than that mean.
From January to February, average highs rise by 0.5°C to 4.6°C, and monthly rainfall falls from 254 mm to 179 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
Jōetsu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 4.1°C-1.1°C | -1.1°C | 254 | 26.0 | 9.910 h |
| February | 4.6°C-1.3°C | -1.3°C | 179 | 21.4 | 10.811 h |
| March | 8.3°C0.6°C | 0.6°C | 145 | 19.6 | 11.912 h |
| April | 15.2°C5.4°C | 5.4°C | 97 | 13.4 | 13.113 h |
| May | 21.0°C11.5°C | 11.5°C | 92 | 11.6 | 14.114 h |
| June | 24.4°C16.4°C | 16.4°C | 115 | 11.5 | 14.715 h |
| July | 27.8°C20.9°C | 20.9°C | 191 | 14.4 | 14.414 h |
| August | 29.3°C22.2°C | 22.2°C | 122 | 12.1 | 13.614 h |
| September | 25.2°C18.4°C | 18.4°C | 162 | 14.1 | 12.512 h |
| October | 19.6°C12.4°C | 12.4°C | 164 | 15.1 | 11.311 h |
| November | 13.7°C6.4°C | 6.4°C | 180 | 18.5 | 10.210 h |
| December | 7.4°C1.2°C | 1.2°C | 247 | 24.2 | 9.710 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
- Kashiwazaki in JanuaryJapan · 37 kmHigh 4.1°C · Low -1.6°C · 216 mm rain
- Nagano in JanuaryJapan · 56 kmHigh 2.1°C · Low -4.7°C · 148 mm rain
- Nagaoka in JanuaryJapan · 64 kmHigh 3.8°C · Low -2.5°C · 179 mm rain
- Sanjō in JanuaryJapan · 82 kmHigh 3.9°C · Low -2.0°C · 206 mm rain
- Ueda in JanuaryJapan · 83 kmHigh 3.4°C · Low -4.4°C · 90 mm rain
- Tsubame in JanuaryJapan · 84 kmHigh 4.0°C · Low -0.9°C · 172 mm rain
- Shibukawa in JanuaryJapan · 100 kmHigh 5.2°C · Low -3.3°C · 68 mm rain
- Azumino in JanuaryJapan · 101 kmHigh 1.6°C · Low -6.7°C · 106 mm precipitation
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 Jōetsu) is explained once on the Jōetsu year overview and on the Sources, method and limits page.