Climate averages 1991–2020
Nagano weather
in January.
A cold, wet month: the coolest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Nagano: daytime highs average 2.1°C and nights cool to about -4.7°C. By daytime temperature it is the coolest month of the year.
Expect about 148 mm of rain on roughly 23 days, which makes January a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 58 min on an average January day.
The nearest other city in this atlas is Ueda (29 km away). In January its highs average 3.4°C, 1.3°C warmer than Nagano, with 90 mm of rain.
Among the 303 cities listed in Japan, Nagano ranks 274th of 303 for the warmest January highs and 280th of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Nagano is 4.9°C cooler than that mean.
From January to February, average highs rise by 1.1°C to 3.2°C, and monthly rainfall falls from 148 mm to 121 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
Nagano climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 2.1°C-4.7°C | -4.7°C | 148 | 22.8 | 10.010 h |
| February | 3.2°C-4.4°C | -4.4°C | 121 | 19.1 | 10.811 h |
| March | 7.1°C-1.5°C | -1.5°C | 138 | 18.6 | 11.912 h |
| April | 13.9°C3.2°C | 3.2°C | 115 | 14.6 | 13.113 h |
| May | 20.6°C9.7°C | 9.7°C | 133 | 14.7 | 14.114 h |
| June | 23.7°C14.7°C | 14.7°C | 178 | 18.1 | 14.615 h |
| July | 26.9°C19.0°C | 19.0°C | 243 | 21.7 | 14.414 h |
| August | 28.1°C19.9°C | 19.9°C | 169 | 19.5 | 13.614 h |
| September | 23.9°C15.9°C | 15.9°C | 182 | 17.0 | 12.412 h |
| October | 18.0°C9.5°C | 9.5°C | 161 | 15.6 | 11.311 h |
| November | 12.0°C3.2°C | 3.2°C | 116 | 16.4 | 10.310 h |
| December | 5.3°C-2.3°C | -2.3°C | 138 | 20.4 | 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
- Ueda in JanuaryJapan · 29 kmHigh 3.4°C · Low -4.4°C · 90 mm rain
- Azumino in JanuaryJapan · 48 kmHigh 1.6°C · Low -6.7°C · 106 mm precipitation
- Matsumoto in JanuaryJapan · 50 kmHigh 2.2°C · Low -6.5°C · 106 mm rain
- Saku in JanuaryJapan · 55 kmHigh 3.9°C · Low -4.4°C · 55 mm rain
- Jōetsu in JanuaryJapan · 56 kmHigh 4.1°C · Low -1.1°C · 254 mm rain
- Shibukawa in JanuaryJapan · 75 kmHigh 5.2°C · Low -3.3°C · 68 mm rain
- Takasaki in JanuaryJapan · 82 kmHigh 6.8°C · Low -2.7°C · 68 mm rain
- Maebashi in JanuaryJapan · 85 kmHigh 6.6°C · Low -2.4°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 Nagano) is explained once on the Nagano year overview and on the Sources, method and limits page.