Nakanojō climate — normals and trends
Nakanojō (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.4 °C and it receives 1,825 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (22.0 °C on average) and the coldest is January (-3.0 °C). Rainfall peaks in July.
Nakanojō averages 123 frost days, 3 hot days (≥ 30 °C) and 212 rainy days per year.
Nakanojō has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 141 to 105 per year over the period.
The hottest day of the period reached 33.5 °C (on 29 June 2022) and the coldest -21.0 °C (on 15 February 1942).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
NakanojōGunma
- coords
- 36.59°, 138.84°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.4°C
Average daily high
13.6°C
Average daily low
5.7°C
Annual rainfall
1,825mm
Sunshine / day
8.8h
Mean relative humidity
77%
Average peak wind
10.5km/h
Seasonal range
25.0°C
Frost days (< 0 °C)
123 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
212 d/yr
Annual snowfall
163.4 cm
Average feels-like high
12.6 °C
Average feels-like low
3.9 °C
Average peak gust
34.9 km/h
Tropical nights (≥ 20 °C)
16 d/yr
Solar radiation
14.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.70 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
33.5 °C
29 June 2022
Coldest day
-21.0 °C
15 February 1942
Wettest day
233 mm
12 October 2019
Windiest day
41.7 km/h
2 August 1982
Strongest gust
177.1 km/h
27 September 1959
Hottest feels-like
39.1 °C
15 July 2018
Coldest feels-like
-26.0 °C
17 January 1942
Snowiest day
60.9 cm
15 February 2014
Sunniest day
14.0 h
15 June 2004
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 3.1 °C | +1.8 °C | 45 mm | -22 mm |
| Feb | 2.0 °C | -0.1 °C | 57 mm | -18 mm |
| Mar | 7.8 °C | +1.8 °C | 147 mm | +41 mm |
| Apr | 14.7 °C | +2.1 °C | 123 mm | +3 mm |
| May | 18.2 °C | +0.3 °C | 182 mm | +24 mm |
| Jun | 24.0 °C | +3.2 °C | 194 mm | -51 mm |
| Jul | 27.6 °C | +2.8 °C | 284 mm | -6 mm |
| Aug | 28.4 °C | +2.6 °C | 175 mm | -61 mm |
| Sep | 24.4 °C | +2.8 °C | 192 mm | -38 mm |
| Oct | 16.3 °C | +0.5 °C | 162 mm | +5 mm |
| Nov | 10.9 °C | +0.7 °C | 46 mm | -34 mm |
| Dec | 5.8 °C | +1.4 °C | 73 mm | +10 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Nakanojō?
Nakanojō has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.4 °C and it receives 1,825 mm of precipitation per year.
What is the hottest day ever recorded in Nakanojō?
The hottest day measured in Nakanojō between 1940 and 2025 was 29 June 2022, reaching 33.5 °C.
What is the coldest day in Nakanojō?
The coldest day measured in Nakanojō between 1940 and 2025 was 15 February 1942, at -21.0 °C.
Does it snow in Nakanojō?
Yes. Nakanojō gets on average 163.4 cm of snow per year and has around 123 frost days.
Has the climate of Nakanojō warmed?
Yes: Nakanojō warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nakanojō?
The wettest day measured in Nakanojō between 1940 and 2025 was 12 October 2019, with 233 mm of rain in 24 hours.
What was the windiest day in Nakanojō?
The windiest day measured in Nakanojō between 1940 and 2025 was 2 August 1982, with winds reaching 41.7 km/h.
What is the warmest month in Nakanojō?
The warmest month in Nakanojō is August (22.0 °C on average); the coldest is January (-3.0 °C).
How much does it rain in Nakanojō?
Nakanojō receives on average 1,825 mm of precipitation per year, spread over about 212 rainy days.
Is it sunny in Nakanojō?
Nakanojō gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Nakanojō?
The heaviest 24-hour snowfall measured in Nakanojō between 1940 and 2025 was 15 February 2014, with 60.9 cm.
Are there tropical nights in Nakanojō?
Yes: Nakanojō has on average 16 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nakanojō?
In Nakanojō, between 1940 and 2025, the highest apparent temperature reached 39.1 °C on 15 July 2018, and the lowest was -26.0 °C on 17 January 1942.
Compare Nakanojō with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nakanojō