Hachinohe climate — normals and trends
Hachinohe (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 1,001 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 (23.2 °C on average) and the coldest is January (-1.6 °C). Rainfall peaks in September.
Hachinohe averages 103 frost days, 10 hot days (≥ 30 °C) and 128 rainy days per year.
Hachinohe has warmed by +2.6 °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 124 to 82 per year over the period.
The hottest day of the period reached 36.4 °C (on 10 August 2023) and the coldest -17.5 °C (on 28 January 1945).
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
HachinoheAomori
- coords
- 40.50°, 141.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
14.1°C
Average daily low
6.9°C
Annual rainfall
1,001mm
Sunshine / day
8.6h
Mean relative humidity
73%
Average peak wind
19.8km/h
Seasonal range
24.8°C
Frost days (< 0 °C)
103 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
128 d/yr
Annual snowfall
95.1 cm
Average feels-like high
12.1 °C
Average feels-like low
4.2 °C
Average peak gust
42.5 km/h
Tropical nights (≥ 20 °C)
31 d/yr
Solar radiation
13.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.60 · 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
36.4 °C
10 August 2023
Coldest day
-17.5 °C
28 January 1945
Wettest day
140 mm
15 September 1947
Windiest day
61.4 km/h
20 February 1955
Strongest gust
130.0 km/h
28 September 1991
Hottest feels-like
42.6 °C
24 August 2023
Coldest feels-like
-22.5 °C
28 January 1945
Snowiest day
48.1 cm
29 March 1966
Sunniest day
14.9 h
14 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 | 4.1 °C | +2.5 °C | 43 mm | -3 mm |
| Feb | 4.3 °C | +2.2 °C | 25 mm | -25 mm |
| Mar | 8.8 °C | +2.3 °C | 109 mm | +37 mm |
| Apr | 13.7 °C | +0.3 °C | 97 mm | +20 mm |
| May | 19.1 °C | +0.9 °C | 94 mm | +11 mm |
| Jun | 25.8 °C | +4.9 °C | 51 mm | -43 mm |
| Jul | 30.8 °C | +6.2 °C | 46 mm | -80 mm |
| Aug | 30.9 °C | +4.2 °C | 55 mm | -73 mm |
| Sep | 26.4 °C | +3.4 °C | 116 mm | -15 mm |
| Oct | 17.6 °C | +0.4 °C | 61 mm | -28 mm |
| Nov | 11.6 °C | +1.1 °C | 131 mm | +75 mm |
| Dec | 6.4 °C | +2.0 °C | 76 mm | +26 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 Hachinohe?
Hachinohe has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 1,001 mm of precipitation per year.
What is the hottest day ever recorded in Hachinohe?
The hottest day measured in Hachinohe between 1940 and 2025 was 10 August 2023, reaching 36.4 °C.
What is the coldest day in Hachinohe?
The coldest day measured in Hachinohe between 1940 and 2025 was 28 January 1945, at -17.5 °C.
Does it snow in Hachinohe?
Yes. Hachinohe gets on average 95.1 cm of snow per year and has around 103 frost days.
Has the climate of Hachinohe warmed?
Yes: Hachinohe warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hachinohe?
The wettest day measured in Hachinohe between 1940 and 2025 was 15 September 1947, with 140 mm of rain in 24 hours.
What was the windiest day in Hachinohe?
The windiest day measured in Hachinohe between 1940 and 2025 was 20 February 1955, with winds reaching 61.4 km/h.
What is the warmest month in Hachinohe?
The warmest month in Hachinohe is August (23.2 °C on average); the coldest is January (-1.6 °C).
How much does it rain in Hachinohe?
Hachinohe receives on average 1,001 mm of precipitation per year, spread over about 128 rainy days.
Is it sunny in Hachinohe?
Hachinohe gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hachinohe?
The heaviest 24-hour snowfall measured in Hachinohe between 1940 and 2025 was 29 March 1966, with 48.1 cm.
Are there tropical nights in Hachinohe?
Yes: Hachinohe has on average 31 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hachinohe?
In Hachinohe, between 1940 and 2025, the highest apparent temperature reached 42.6 °C on 24 August 2023, and the lowest was -22.5 °C on 28 January 1945.
Compare Hachinohe with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hachinohe