Imaichi climate — normals and trends
Imaichi (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.9 °C and it receives 2,133 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 (22.9 °C on average) and the coldest is January (-0.8 °C). Rainfall peaks in July.
Imaichi averages 103 frost days, 6 hot days (≥ 30 °C) and 198 rainy days per year.
Imaichi 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 122 to 84 per year over the period.
The hottest day of the period reached 33.8 °C (on 24 July 1987) and the coldest -15.5 °C (on 15 February 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
ImaichiTochigi
- coords
- 36.72°, 139.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.9°C
Average daily high
15.0°C
Average daily low
7.2°C
Annual rainfall
2,133mm
Sunshine / day
8.3h
Mean relative humidity
75%
Average peak wind
10.4km/h
Seasonal range
23.7°C
Frost days (< 0 °C)
103 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
198 d/yr
Annual snowfall
86.0 cm
Average feels-like high
14.3 °C
Average feels-like low
5.8 °C
Average peak gust
32.2 km/h
Tropical nights (≥ 20 °C)
33 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.67 · 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
33.8 °C
24 July 1987
Coldest day
-15.5 °C
15 February 1942
Wettest day
230 mm
12 October 2019
Windiest day
49.3 km/h
16 September 1961
Strongest gust
168.1 km/h
27 September 1959
Hottest feels-like
40.8 °C
10 August 2013
Coldest feels-like
-20.4 °C
16 February 1967
Snowiest day
48.9 cm
15 February 2014
Sunniest day
14.1 h
23 June 1987
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 | 5.1 °C | +1.6 °C | 42 mm | -10 mm |
| Feb | 4.1 °C | -0.1 °C | 18 mm | -43 mm |
| Mar | 10.1 °C | +2.2 °C | 130 mm | +17 mm |
| Apr | 15.4 °C | +1.3 °C | 154 mm | +8 mm |
| May | 19.0 °C | +0.1 °C | 270 mm | +76 mm |
| Jun | 25.1 °C | +3.5 °C | 241 mm | -39 mm |
| Jul | 28.7 °C | +3.3 °C | 255 mm | -78 mm |
| Aug | 29.2 °C | +2.6 °C | 230 mm | -76 mm |
| Sep | 25.7 °C | +3.1 °C | 246 mm | -55 mm |
| Oct | 17.9 °C | +0.8 °C | 176 mm | -20 mm |
| Nov | 12.8 °C | +1.0 °C | 46 mm | -49 mm |
| Dec | 6.7 °C | +0.5 °C | 65 mm | +8 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 Imaichi?
Imaichi has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.9 °C and it receives 2,133 mm of precipitation per year.
What is the hottest day ever recorded in Imaichi?
The hottest day measured in Imaichi between 1940 and 2025 was 24 July 1987, reaching 33.8 °C.
What is the coldest day in Imaichi?
The coldest day measured in Imaichi between 1940 and 2025 was 15 February 1942, at -15.5 °C.
Does it snow in Imaichi?
Yes. Imaichi gets on average 86.0 cm of snow per year and has around 103 frost days.
Has the climate of Imaichi warmed?
Yes: Imaichi warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Imaichi?
The wettest day measured in Imaichi between 1940 and 2025 was 12 October 2019, with 230 mm of rain in 24 hours.
What was the windiest day in Imaichi?
The windiest day measured in Imaichi between 1940 and 2025 was 16 September 1961, with winds reaching 49.3 km/h.
What is the warmest month in Imaichi?
The warmest month in Imaichi is August (22.9 °C on average); the coldest is January (-0.8 °C).
How much does it rain in Imaichi?
Imaichi receives on average 2,133 mm of precipitation per year, spread over about 198 rainy days.
Is it sunny in Imaichi?
Imaichi gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Imaichi?
The heaviest 24-hour snowfall measured in Imaichi between 1940 and 2025 was 15 February 2014, with 48.9 cm.
Are there tropical nights in Imaichi?
Yes: Imaichi has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Imaichi?
In Imaichi, between 1940 and 2025, the highest apparent temperature reached 40.8 °C on 10 August 2013, and the lowest was -20.4 °C on 16 February 1967.
Compare Imaichi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Imaichi