Daisen climate — normals and trends
Daisen (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.2 °C and it receives 1,652 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 (23.5 °C on average) and the coldest is January (-2.1 °C). Rainfall peaks in July.
Daisen averages 116 frost days, 9 hot days (≥ 30 °C) and 208 rainy days per year.
Daisen has warmed by +2.8 °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 138 to 94 per year over the period.
The hottest day of the period reached 35.4 °C (on 23 August 2018) and the coldest -18.9 °C (on 7 January 1941).
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
DaisenAkita
- coords
- 39.44°, 140.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.2°C
Average daily high
14.0°C
Average daily low
6.3°C
Annual rainfall
1,652mm
Sunshine / day
8.1h
Mean relative humidity
79%
Average peak wind
14.7km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
116 d/yr
Hot days (≥ 30 °C)
9 d/yr
Rainy days (≥ 1 mm)
208 d/yr
Annual snowfall
215.5 cm
Average feels-like high
12.9 °C
Average feels-like low
4.5 °C
Average peak gust
41.9 km/h
Tropical nights (≥ 20 °C)
32 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.66 · 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
35.4 °C
23 August 2018
Coldest day
-18.9 °C
7 January 1941
Wettest day
133 mm
27 July 1941
Windiest day
46.9 km/h
31 March 1979
Strongest gust
135.7 km/h
27 September 1959
Hottest feels-like
41.4 °C
12 August 2007
Coldest feels-like
-23.4 °C
7 January 1941
Snowiest day
25.4 cm
29 March 1966
Sunniest day
14.5 h
17 June 1942
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 | 2.6 °C | +1.7 °C | 114 mm | -1 mm |
| Feb | 2.3 °C | +0.7 °C | 92 mm | -6 mm |
| Mar | 7.3 °C | +1.7 °C | 128 mm | +13 mm |
| Apr | 13.8 °C | +0.9 °C | 170 mm | +53 mm |
| May | 19.3 °C | +0.8 °C | 160 mm | +45 mm |
| Jun | 25.8 °C | +3.6 °C | 156 mm | +20 mm |
| Jul | 30.7 °C | +5.1 °C | 51 mm | -161 mm |
| Aug | 29.9 °C | +2.5 °C | 232 mm | +55 mm |
| Sep | 25.6 °C | +2.6 °C | 279 mm | +108 mm |
| Oct | 17.6 °C | +0.7 °C | 130 mm | +2 mm |
| Nov | 10.9 °C | +0.7 °C | 182 mm | +53 mm |
| Dec | 5.2 °C | +1.5 °C | 168 mm | +33 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 Daisen?
Daisen has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.2 °C and it receives 1,652 mm of precipitation per year.
What is the hottest day ever recorded in Daisen?
The hottest day measured in Daisen between 1940 and 2025 was 23 August 2018, reaching 35.4 °C.
What is the coldest day in Daisen?
The coldest day measured in Daisen between 1940 and 2025 was 7 January 1941, at -18.9 °C.
Does it snow in Daisen?
Yes. Daisen gets on average 215.5 cm of snow per year and has around 116 frost days.
Has the climate of Daisen warmed?
Yes: Daisen warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Daisen?
The wettest day measured in Daisen between 1940 and 2025 was 27 July 1941, with 133 mm of rain in 24 hours.
What was the windiest day in Daisen?
The windiest day measured in Daisen between 1940 and 2025 was 31 March 1979, with winds reaching 46.9 km/h.
What is the warmest month in Daisen?
The warmest month in Daisen is August (23.5 °C on average); the coldest is January (-2.1 °C).
How much does it rain in Daisen?
Daisen receives on average 1,652 mm of precipitation per year, spread over about 208 rainy days.
Is it sunny in Daisen?
Daisen gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Daisen?
The heaviest 24-hour snowfall measured in Daisen between 1940 and 2025 was 29 March 1966, with 25.4 cm.
Are there tropical nights in Daisen?
Yes: Daisen has on average 32 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Daisen?
In Daisen, between 1940 and 2025, the highest apparent temperature reached 41.4 °C on 12 August 2007, and the lowest was -23.4 °C on 7 January 1941.
Compare Daisen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Daisen