Numata climate — normals and trends
Numata (Japan) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 1,604 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 (21.3 °C on average) and the coldest is January (-3.7 °C). Rainfall peaks in July.
Numata averages 131 frost days, 1 hot days (≥ 30 °C) and 211 rainy days per year.
Numata has warmed by +2.6 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 148 to 114 per year over the period.
The hottest day of the period reached 32.5 °C (on 11 August 2020) and the coldest -19.6 °C (on 1 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
NumataGunma
- coords
- 36.63°, 139.05°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
12.6°C
Average daily low
4.9°C
Annual rainfall
1,604mm
Sunshine / day
8.5h
Mean relative humidity
78%
Average peak wind
10.5km/h
Seasonal range
25.0°C
Frost days (< 0 °C)
131 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
211 d/yr
Annual snowfall
242.3 cm
Average feels-like high
11.5 °C
Average feels-like low
3.0 °C
Average peak gust
38.1 km/h
Tropical nights (≥ 20 °C)
6 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.65 · 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
32.5 °C
11 August 2020
Coldest day
-19.6 °C
1 February 1942
Wettest day
179 mm
12 October 2019
Windiest day
46.0 km/h
2 August 1982
Strongest gust
210.6 km/h
27 September 1959
Hottest feels-like
37.5 °C
15 July 2018
Coldest feels-like
-23.9 °C
25 January 1963
Snowiest day
59.6 cm
15 February 2014
Sunniest day
14.1 h
14 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 | 0.6 °C | +0.6 °C | 71 mm | -27 mm |
| Feb | -0.5 °C | -1.3 °C | 102 mm | +8 mm |
| Mar | 6.6 °C | +1.9 °C | 131 mm | +16 mm |
| Apr | 12.9 °C | +1.6 °C | 121 mm | +7 mm |
| May | 17.0 °C | +0.1 °C | 162 mm | +31 mm |
| Jun | 22.8 °C | +2.7 °C | 161 mm | -13 mm |
| Jul | 26.9 °C | +2.9 °C | 103 mm | -105 mm |
| Aug | 27.2 °C | +2.1 °C | 142 mm | -25 mm |
| Sep | 23.5 °C | +2.6 °C | 149 mm | -38 mm |
| Oct | 15.7 °C | +0.6 °C | 121 mm | -17 mm |
| Nov | 9.6 °C | +0.3 °C | 74 mm | -14 mm |
| Dec | 4.0 °C | +0.8 °C | 103 mm | +13 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 Numata?
Numata has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 1,604 mm of precipitation per year.
What is the hottest day ever recorded in Numata?
The hottest day measured in Numata between 1940 and 2025 was 11 August 2020, reaching 32.5 °C.
What is the coldest day in Numata?
The coldest day measured in Numata between 1940 and 2025 was 1 February 1942, at -19.6 °C.
Does it snow in Numata?
Yes. Numata gets on average 242.3 cm of snow per year and has around 131 frost days.
Has the climate of Numata warmed?
Yes: Numata warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Numata?
The wettest day measured in Numata between 1940 and 2025 was 12 October 2019, with 179 mm of rain in 24 hours.
What was the windiest day in Numata?
The windiest day measured in Numata between 1940 and 2025 was 2 August 1982, with winds reaching 46.0 km/h.
What is the warmest month in Numata?
The warmest month in Numata is August (21.3 °C on average); the coldest is January (-3.7 °C).
How much does it rain in Numata?
Numata receives on average 1,604 mm of precipitation per year, spread over about 211 rainy days.
Is it sunny in Numata?
Numata gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Numata?
The heaviest 24-hour snowfall measured in Numata between 1940 and 2025 was 15 February 2014, with 59.6 cm.
Are there tropical nights in Numata?
Yes: Numata has on average 6 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Numata?
In Numata, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 15 July 2018, and the lowest was -23.9 °C on 25 January 1963.
Compare Numata with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Numata