Tamamura climate — normals and trends
Tamamura (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.2 °C and it receives 1,990 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 (24.7 °C on average) and the coldest is January (2.1 °C). Rainfall peaks in July.
Tamamura averages 64 frost days, 21 hot days (≥ 30 °C) and 191 rainy days per year.
Tamamura has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 94 to 34 per year over the period.
The hottest day of the period reached 36.5 °C (on 29 July 2024) and the coldest -14.8 °C (on 17 January 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
TamamuraGunma
- coords
- 36.30°, 139.12°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.2°C
Average daily high
17.5°C
Average daily low
9.4°C
Annual rainfall
1,990mm
Sunshine / day
8.5h
Mean relative humidity
71%
Average peak wind
11.0km/h
Seasonal range
22.6°C
Frost days (< 0 °C)
64 d/yr
Hot days (≥ 30 °C)
21 d/yr
Rainy days (≥ 1 mm)
191 d/yr
Annual snowfall
56.0 cm
Average feels-like high
17.2 °C
Average feels-like low
8.3 °C
Average peak gust
30.7 km/h
Tropical nights (≥ 20 °C)
56 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.71 · 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
36.5 °C
29 July 2024
Coldest day
-14.8 °C
17 January 1942
Wettest day
258 mm
12 October 2019
Windiest day
44.4 km/h
2 August 1982
Strongest gust
155.9 km/h
2 August 1982
Hottest feels-like
43.2 °C
16 July 2023
Coldest feels-like
-20.2 °C
17 January 1942
Snowiest day
60.6 cm
15 February 2014
Sunniest day
14.0 h
13 June 1940
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 | 9.0 °C | +1.9 °C | 50 mm | -5 mm |
| Feb | 8.1 °C | +0.4 °C | 19 mm | -54 mm |
| Mar | 13.3 °C | +2.0 °C | 161 mm | +41 mm |
| Apr | 18.3 °C | +1.4 °C | 170 mm | +30 mm |
| May | 21.1 °C | +0.1 °C | 236 mm | +55 mm |
| Jun | 26.8 °C | +3.4 °C | 191 mm | -68 mm |
| Jul | 30.6 °C | +3.5 °C | 139 mm | -148 mm |
| Aug | 31.4 °C | +3.1 °C | 114 mm | -140 mm |
| Sep | 27.3 °C | +3.0 °C | 245 mm | -28 mm |
| Oct | 19.4 °C | +0.4 °C | 149 mm | -51 mm |
| Nov | 15.2 °C | +0.8 °C | 23 mm | -67 mm |
| Dec | 11.0 °C | +1.2 °C | 44 mm | -12 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 Tamamura?
Tamamura has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,990 mm of precipitation per year.
What is the hottest day ever recorded in Tamamura?
The hottest day measured in Tamamura between 1940 and 2025 was 29 July 2024, reaching 36.5 °C.
What is the coldest day in Tamamura?
The coldest day measured in Tamamura between 1940 and 2025 was 17 January 1942, at -14.8 °C.
Does it snow in Tamamura?
Yes. Tamamura gets on average 56.0 cm of snow per year and has around 64 frost days.
Has the climate of Tamamura warmed?
Yes: Tamamura warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Tamamura?
The wettest day measured in Tamamura between 1940 and 2025 was 12 October 2019, with 258 mm of rain in 24 hours.
What was the windiest day in Tamamura?
The windiest day measured in Tamamura between 1940 and 2025 was 2 August 1982, with winds reaching 44.4 km/h.
What is the warmest month in Tamamura?
The warmest month in Tamamura is August (24.7 °C on average); the coldest is January (2.1 °C).
How much does it rain in Tamamura?
Tamamura receives on average 1,990 mm of precipitation per year, spread over about 191 rainy days.
Is it sunny in Tamamura?
Tamamura 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 Tamamura?
The heaviest 24-hour snowfall measured in Tamamura between 1940 and 2025 was 15 February 2014, with 60.6 cm.
Are there tropical nights in Tamamura?
Yes: Tamamura has on average 56 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Tamamura?
In Tamamura, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 16 July 2023, and the lowest was -20.2 °C on 17 January 1942.
Compare Tamamura with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Tamamura