Aomori climate — normals and trends
Aomori (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.1 °C and it receives 1,262 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 (22.6 °C on average) and the coldest is January (-3.4 °C). Rainfall peaks in August.
Aomori averages 125 frost days, 6 hot days (≥ 30 °C) and 180 rainy days per year.
Aomori has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 142 to 108 per year over the period.
The hottest day of the period reached 36.4 °C (on 10 August 2023) and the coldest -18.6 °C (on 27 January 2000).
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
AomoriAomori
- coords
- 40.82°, 140.73°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.1°C
Average daily high
12.8°C
Average daily low
5.6°C
Annual rainfall
1,262mm
Sunshine / day
8.4h
Mean relative humidity
78%
Average peak wind
16.5km/h
Seasonal range
26.0°C
Frost days (< 0 °C)
125 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
180 d/yr
Annual snowfall
193.7 cm
Average feels-like high
11.0 °C
Average feels-like low
3.3 °C
Average peak gust
43.9 km/h
Tropical nights (≥ 20 °C)
25 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.60 · 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
-18.6 °C
27 January 2000
Wettest day
172 mm
3 August 2022
Windiest day
46.7 km/h
20 February 1955
Strongest gust
140.4 km/h
28 September 1991
Hottest feels-like
42.2 °C
23 August 2023
Coldest feels-like
-23.1 °C
27 January 2000
Snowiest day
46.8 cm
29 March 1966
Sunniest day
14.8 h
13 June 1986
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 | 1.6 °C | +2.3 °C | 80 mm | +6 mm |
| Feb | 1.3 °C | +1.3 °C | 61 mm | -8 mm |
| Mar | 5.2 °C | +1.1 °C | 118 mm | +30 mm |
| Apr | 12.6 °C | +0.8 °C | 118 mm | +29 mm |
| May | 18.5 °C | +0.9 °C | 84 mm | -8 mm |
| Jun | 25.1 °C | +4.0 °C | 70 mm | -35 mm |
| Jul | 30.2 °C | +5.5 °C | 71 mm | -82 mm |
| Aug | 28.8 °C | +2.5 °C | 165 mm | +2 mm |
| Sep | 24.9 °C | +2.8 °C | 134 mm | -16 mm |
| Oct | 16.4 °C | +0.6 °C | 76 mm | -28 mm |
| Nov | 9.7 °C | +1.1 °C | 144 mm | +56 mm |
| Dec | 3.7 °C | +1.6 °C | 145 mm | +58 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 Aomori?
Aomori has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.1 °C and it receives 1,262 mm of precipitation per year.
What is the hottest day ever recorded in Aomori?
The hottest day measured in Aomori between 1940 and 2025 was 10 August 2023, reaching 36.4 °C.
What is the coldest day in Aomori?
The coldest day measured in Aomori between 1940 and 2025 was 27 January 2000, at -18.6 °C.
Does it snow in Aomori?
Yes. Aomori gets on average 193.7 cm of snow per year and has around 125 frost days.
Has the climate of Aomori warmed?
Yes: Aomori warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Aomori?
The wettest day measured in Aomori between 1940 and 2025 was 3 August 2022, with 172 mm of rain in 24 hours.
What was the windiest day in Aomori?
The windiest day measured in Aomori between 1940 and 2025 was 20 February 1955, with winds reaching 46.7 km/h.
What is the warmest month in Aomori?
The warmest month in Aomori is August (22.6 °C on average); the coldest is January (-3.4 °C).
How much does it rain in Aomori?
Aomori receives on average 1,262 mm of precipitation per year, spread over about 180 rainy days.
Is it sunny in Aomori?
Aomori gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Aomori?
The heaviest 24-hour snowfall measured in Aomori between 1940 and 2025 was 29 March 1966, with 46.8 cm.
Are there tropical nights in Aomori?
Yes: Aomori has on average 25 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Aomori?
In Aomori, between 1940 and 2025, the highest apparent temperature reached 42.2 °C on 23 August 2023, and the lowest was -23.1 °C on 27 January 2000.
Compare Aomori with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Aomori