Climate averages 1991–2020
Sanjō weather
in January.
A cold, very wet month: the coolest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Sanjō: daytime highs average 3.9°C and nights cool to about -2.0°C. By daytime temperature it is the coolest month of the year.
Expect about 206 mm of rain on roughly 26 days, which makes January a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 53 min on an average January day.
The nearest other city in this atlas is Tsubame (6 km away). In January its highs average 4.0°C, about as warm as Sanjō, with 172 mm of rain.
Among the 303 cities listed in Japan, Sanjō ranks joint 258th of 303 for the warmest January highs and 291st of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Sanjō is 3.1°C cooler than that mean.
From January to February, average highs rise by 0.7°C to 4.6°C, and monthly rainfall falls from 206 mm to 151 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
Sanjō climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 3.9°C-2.0°C | -2.0°C | 206 | 25.7 | 9.910 h |
| February | 4.6°C-2.4°C | -2.4°C | 151 | 21.7 | 10.811 h |
| March | 9.0°C0.0°C | 0.0°C | 150 | 20.8 | 11.912 h |
| April | 15.5°C4.9°C | 4.9°C | 116 | 15.3 | 13.113 h |
| May | 21.1°C10.6°C | 10.6°C | 116 | 13.1 | 14.214 h |
| June | 24.7°C15.8°C | 15.8°C | 143 | 14.1 | 14.715 h |
| July | 27.8°C20.4°C | 20.4°C | 244 | 17.7 | 14.514 h |
| August | 29.4°C21.8°C | 21.8°C | 169 | 15.6 | 13.614 h |
| September | 25.4°C17.9°C | 17.9°C | 156 | 15.1 | 12.512 h |
| October | 19.4°C11.5°C | 11.5°C | 157 | 15.8 | 11.311 h |
| November | 13.3°C5.6°C | 5.6°C | 153 | 18.5 | 10.210 h |
| December | 7.1°C0.6°C | 0.6°C | 202 | 24.0 | 9.610 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
- Tsubame in JanuaryJapan · 6 kmHigh 4.0°C · Low -0.9°C · 172 mm rain
- Nagaoka in JanuaryJapan · 21 kmHigh 3.8°C · Low -2.5°C · 179 mm rain
- Niigata in JanuaryJapan · 35 kmHigh 4.2°C · Low 0.0°C · 178 mm rain
- Kashiwazaki in JanuaryJapan · 45 kmHigh 4.1°C · Low -1.6°C · 216 mm rain
- Shibata in JanuaryJapan · 50 kmHigh 3.1°C · Low -2.1°C · 217 mm rain
- Jōetsu in JanuaryJapan · 82 kmHigh 4.1°C · Low -1.1°C · 254 mm rain
- Aizu-Wakamatsu in JanuaryJapan · 89 kmHigh 2.0°C · Low -3.6°C · 99 mm rain
- Yonezawa in JanuaryJapan · 108 kmHigh 1.7°C · Low -4.6°C · 190 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 Sanjō) is explained once on the Sanjō year overview and on the Sources, method and limits page.