Climate averages 1991–2020
Nagaoka weather
in January.
A cold, wet month: the coolest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Nagaoka: daytime highs average 3.8°C and nights cool to about -2.5°C. By daytime temperature it is the coolest month of the year.
Expect about 179 mm of rain on roughly 25 days, which makes January a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 54 min on an average January day.
The nearest other city in this atlas is Sanjō (21 km away). In January its highs average 3.9°C, about as warm as Nagaoka, with 206 mm of rain.
Among the 303 cities listed in Japan, Nagaoka ranks joint 260th of 303 for the warmest January highs and 287th of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Nagaoka is 3.2°C cooler than that mean.
From January to February, average highs rise by 0.8°C to 4.5°C, and monthly rainfall falls from 179 mm to 127 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
Nagaoka climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 3.8°C-2.5°C | -2.5°C | 179 | 25.1 | 9.910 h |
| February | 4.5°C-2.7°C | -2.7°C | 127 | 20.6 | 10.811 h |
| March | 8.9°C-0.4°C | -0.4°C | 126 | 19.6 | 11.912 h |
| April | 15.7°C4.8°C | 4.8°C | 94 | 14.3 | 13.113 h |
| May | 21.4°C10.6°C | 10.6°C | 94 | 11.9 | 14.214 h |
| June | 25.1°C15.7°C | 15.7°C | 115 | 12.5 | 14.715 h |
| July | 28.1°C20.4°C | 20.4°C | 207 | 16.1 | 14.514 h |
| August | 29.8°C21.6°C | 21.6°C | 146 | 14.1 | 13.614 h |
| September | 25.6°C17.7°C | 17.7°C | 144 | 14.0 | 12.512 h |
| October | 19.5°C11.3°C | 11.3°C | 143 | 14.8 | 11.311 h |
| November | 13.3°C5.3°C | 5.3°C | 145 | 18.2 | 10.210 h |
| December | 7.0°C0.2°C | 0.2°C | 181 | 23.7 | 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
- Sanjō in JanuaryJapan · 21 kmHigh 3.9°C · Low -2.0°C · 206 mm rain
- Tsubame in JanuaryJapan · 25 kmHigh 4.0°C · Low -0.9°C · 172 mm rain
- Kashiwazaki in JanuaryJapan · 28 kmHigh 4.1°C · Low -1.6°C · 216 mm rain
- Niigata in JanuaryJapan · 55 kmHigh 4.2°C · Low 0.0°C · 178 mm rain
- Jōetsu in JanuaryJapan · 64 kmHigh 4.1°C · Low -1.1°C · 254 mm rain
- Shibata in JanuaryJapan · 70 kmHigh 3.1°C · Low -2.1°C · 217 mm rain
- Aizu-Wakamatsu in JanuaryJapan · 97 kmHigh 2.0°C · Low -3.6°C · 99 mm rain
- Nikkō in JanuaryJapan · 103 kmHigh 3.3°C · Low -5.1°C · 62 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 Nagaoka) is explained once on the Nagaoka year overview and on the Sources, method and limits page.