Shiroishi climate — normals and trends
Shiroishi (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 1,295 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 (-1.8 °C). Rainfall peaks in July.
Shiroishi averages 113 frost days, 11 hot days (≥ 30 °C) and 172 rainy days per year.
Shiroishi 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 133 to 93 per year over the period.
The hottest day of the period reached 36.0 °C (on 14 August 1994) and the coldest -19.4 °C (on 17 January 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
ShiroishiMiyagi
- coords
- 38.00°, 140.62°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
14.5°C
Average daily low
6.6°C
Annual rainfall
1,295mm
Sunshine / day
8.2h
Mean relative humidity
78%
Average peak wind
13.0km/h
Seasonal range
25.0°C
Frost days (< 0 °C)
113 d/yr
Hot days (≥ 30 °C)
11 d/yr
Rainy days (≥ 1 mm)
172 d/yr
Annual snowfall
135.7 cm
Average feels-like high
13.3 °C
Average feels-like low
5.0 °C
Average peak gust
40.7 km/h
Tropical nights (≥ 20 °C)
33 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 = 0.65 · 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
36.0 °C
14 August 1994
Coldest day
-19.4 °C
17 January 1942
Wettest day
168 mm
12 October 2019
Windiest day
45.5 km/h
31 January 1970
Strongest gust
142.6 km/h
23 August 1981
Hottest feels-like
41.6 °C
14 August 1994
Coldest feels-like
-23.9 °C
17 January 1942
Snowiest day
56.6 cm
24 December 1980
Sunniest day
14.3 h
17 June 1953
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 3.4 °C | +1.4 °C | 71 mm | +2 mm |
| Feb | 2.8 °C | 0.0 °C | 52 mm | -13 mm |
| Mar | 8.9 °C | +2.3 °C | 86 mm | -0 mm |
| Apr | 14.7 °C | +1.2 °C | 111 mm | +22 mm |
| May | 19.4 °C | +0.6 °C | 169 mm | +73 mm |
| Jun | 26.2 °C | +4.5 °C | 95 mm | -36 mm |
| Jul | 30.5 °C | +5.1 °C | 70 mm | -109 mm |
| Aug | 29.7 °C | +2.7 °C | 175 mm | +22 mm |
| Sep | 25.8 °C | +3.0 °C | 173 mm | +12 mm |
| Oct | 17.6 °C | +0.6 °C | 167 mm | +48 mm |
| Nov | 12.3 °C | +1.3 °C | 62 mm | -12 mm |
| Dec | 6.9 °C | +2.0 °C | 92 mm | +20 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 Shiroishi?
Shiroishi has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 1,295 mm of precipitation per year.
What is the hottest day ever recorded in Shiroishi?
The hottest day measured in Shiroishi between 1940 and 2025 was 14 August 1994, reaching 36.0 °C.
What is the coldest day in Shiroishi?
The coldest day measured in Shiroishi between 1940 and 2025 was 17 January 1942, at -19.4 °C.
Does it snow in Shiroishi?
Yes. Shiroishi gets on average 135.7 cm of snow per year and has around 113 frost days.
Has the climate of Shiroishi warmed?
Yes: Shiroishi warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Shiroishi?
The wettest day measured in Shiroishi between 1940 and 2025 was 12 October 2019, with 168 mm of rain in 24 hours.
What was the windiest day in Shiroishi?
The windiest day measured in Shiroishi between 1940 and 2025 was 31 January 1970, with winds reaching 45.5 km/h.
What is the warmest month in Shiroishi?
The warmest month in Shiroishi is August (23.2 °C on average); the coldest is January (-1.8 °C).
How much does it rain in Shiroishi?
Shiroishi receives on average 1,295 mm of precipitation per year, spread over about 172 rainy days.
Is it sunny in Shiroishi?
Shiroishi 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 Shiroishi?
The heaviest 24-hour snowfall measured in Shiroishi between 1940 and 2025 was 24 December 1980, with 56.6 cm.
Are there tropical nights in Shiroishi?
Yes: Shiroishi has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Shiroishi?
In Shiroishi, between 1940 and 2025, the highest apparent temperature reached 41.6 °C on 14 August 1994, and the lowest was -23.9 °C on 17 January 1942.
Compare Shiroishi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Shiroishi