Hirosaki climate — normals and trends
Hirosaki (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 1,426 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 (22.3 °C on average) and the coldest is January (-3.7 °C). Rainfall peaks in August.
Hirosaki averages 134 frost days, 5 hot days (≥ 30 °C) and 196 rainy days per year.
Hirosaki has warmed by +2.5 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 151 to 117 per year over the period.
The hottest day of the period reached 34.9 °C (on 15 August 2019) and the coldest -18.5 °C (on 7 January 1985).
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
HirosakiAomori
- coords
- 40.59°, 140.47°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
12.6°C
Average daily low
5.0°C
Annual rainfall
1,426mm
Sunshine / day
8.2h
Mean relative humidity
80%
Average peak wind
14.2km/h
Seasonal range
26.0°C
Frost days (< 0 °C)
134 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
196 d/yr
Annual snowfall
237.2 cm
Average feels-like high
11.0 °C
Average feels-like low
2.9 °C
Average peak gust
41.6 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.62 · 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
34.9 °C
15 August 2019
Coldest day
-18.5 °C
7 January 1985
Wettest day
117 mm
10 July 2014
Windiest day
47.2 km/h
26 September 1954
Strongest gust
146.9 km/h
28 September 1991
Hottest feels-like
40.5 °C
23 August 2023
Coldest feels-like
-22.8 °C
7 January 1985
Snowiest day
43.3 cm
29 March 1966
Sunniest day
14.8 h
21 June 1958
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 | 1.3 °C | +2.2 °C | 95 mm | +4 mm |
| Feb | 0.8 °C | +0.9 °C | 84 mm | +2 mm |
| Mar | 5.0 °C | +1.2 °C | 119 mm | +17 mm |
| Apr | 12.5 °C | +1.3 °C | 146 mm | +46 mm |
| May | 17.9 °C | +0.5 °C | 106 mm | +8 mm |
| Jun | 23.9 °C | +2.7 °C | 75 mm | -37 mm |
| Jul | 29.5 °C | +4.9 °C | 51 mm | -110 mm |
| Aug | 28.3 °C | +2.2 °C | 166 mm | -5 mm |
| Sep | 24.3 °C | +2.6 °C | 165 mm | +2 mm |
| Oct | 15.9 °C | +0.4 °C | 82 mm | -40 mm |
| Nov | 9.2 °C | +0.9 °C | 181 mm | +69 mm |
| Dec | 3.3 °C | +1.5 °C | 178 mm | +65 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 Hirosaki?
Hirosaki has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 1,426 mm of precipitation per year.
What is the hottest day ever recorded in Hirosaki?
The hottest day measured in Hirosaki between 1940 and 2025 was 15 August 2019, reaching 34.9 °C.
What is the coldest day in Hirosaki?
The coldest day measured in Hirosaki between 1940 and 2025 was 7 January 1985, at -18.5 °C.
Does it snow in Hirosaki?
Yes. Hirosaki gets on average 237.2 cm of snow per year and has around 134 frost days.
Has the climate of Hirosaki warmed?
Yes: Hirosaki warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hirosaki?
The wettest day measured in Hirosaki between 1940 and 2025 was 10 July 2014, with 117 mm of rain in 24 hours.
What was the windiest day in Hirosaki?
The windiest day measured in Hirosaki between 1940 and 2025 was 26 September 1954, with winds reaching 47.2 km/h.
What is the warmest month in Hirosaki?
The warmest month in Hirosaki is August (22.3 °C on average); the coldest is January (-3.7 °C).
How much does it rain in Hirosaki?
Hirosaki receives on average 1,426 mm of precipitation per year, spread over about 196 rainy days.
Is it sunny in Hirosaki?
Hirosaki gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hirosaki?
The heaviest 24-hour snowfall measured in Hirosaki between 1940 and 2025 was 29 March 1966, with 43.3 cm.
Are there tropical nights in Hirosaki?
Yes: Hirosaki has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hirosaki?
In Hirosaki, between 1940 and 2025, the highest apparent temperature reached 40.5 °C on 23 August 2023, and the lowest was -22.8 °C on 7 January 1985.
Compare Hirosaki with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hirosaki