Climate averages 1991–2020
Nagaoka weather
in December.
A cold, very wet month: the 10th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Nagaoka: daytime highs average 7.0°C and nights cool to about 0.2°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 181 mm of rain on roughly 24 days, which makes December a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 38 min on an average December day.
The nearest other city in this atlas is Sanjō (21 km away). In December its highs average 7.1°C, about as warm as Nagaoka, with 202 mm of rain.
Among the 303 cities listed in Japan, Nagaoka ranks 258th of 303 for the warmest December highs and joint 282nd of 303 for the driest December (rainfall, lowest first). The mean December high of those 303 cities is 9.5°C; Nagaoka is 2.5°C cooler than that mean.
From December to January, average highs fall by 3.2°C to 3.8°C, and monthly rainfall falls from 181 mm to 179 mm.
The annual picture
December 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 | 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, selected | 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
December in nearby cities
- Sanjō in DecemberJapan · 21 kmHigh 7.1°C · Low 0.6°C · 202 mm rain
- Tsubame in DecemberJapan · 25 kmHigh 7.3°C · Low 1.7°C · 182 mm rain
- Kashiwazaki in DecemberJapan · 28 kmHigh 7.4°C · Low 0.8°C · 208 mm rain
- Niigata in DecemberJapan · 55 kmHigh 7.5°C · Low 2.7°C · 195 mm rain
- Jōetsu in DecemberJapan · 64 kmHigh 7.4°C · Low 1.2°C · 247 mm rain
- Shibata in DecemberJapan · 70 kmHigh 6.4°C · Low 0.7°C · 233 mm rain
- Aizu-Wakamatsu in DecemberJapan · 97 kmHigh 5.2°C · Low -0.8°C · 93 mm rain
- Nikkō in DecemberJapan · 103 kmHigh 6.4°C · Low -1.8°C · 59 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.