Hiratachō climate — normals and trends
Hiratachō (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.5 °C and it receives 1,725 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 (26.3 °C on average) and the coldest is January (6.1 °C). Rainfall peaks in July.
Hiratachō averages 2 frost days, 2 hot days (≥ 30 °C) and 177 rainy days per year.
Hiratachō has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 4 to 0 per year over the period.
The hottest day of the period reached 32.5 °C (on 11 August 1994) and the coldest -5.2 °C (on 26 February 1981).
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
HiratachōShimane
- coords
- 35.43°, 132.82°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.5°C
Average daily high
16.9°C
Average daily low
14.1°C
Annual rainfall
1,725mm
Sunshine / day
8.8h
Mean relative humidity
74%
Average peak wind
28.8km/h
Seasonal range
20.2°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
177 d/yr
Annual snowfall
54.7 cm
Average feels-like high
15.7 °C
Average feels-like low
11.4 °C
Average peak gust
43.6 km/h
Tropical nights (≥ 20 °C)
99 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.45 · 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
32.5 °C
11 August 1994
Coldest day
-5.2 °C
26 February 1981
Wettest day
171 mm
10 August 2025
Windiest day
94.5 km/h
26 September 1954
Strongest gust
154.8 km/h
27 September 1991
Hottest feels-like
39.5 °C
5 August 2010
Coldest feels-like
-17.7 °C
26 February 1981
Snowiest day
18.2 cm
30 December 1960
Sunniest day
14.0 h
27 May 1940
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 | 8.2 °C | +0.7 °C | 134 mm | -23 mm |
| Feb | 6.5 °C | -1.1 °C | 136 mm | +10 mm |
| Mar | 11.0 °C | +0.7 °C | 169 mm | +49 mm |
| Apr | 14.9 °C | +0.4 °C | 93 mm | -21 mm |
| May | 18.4 °C | +0.2 °C | 167 mm | +44 mm |
| Jun | 23.3 °C | +1.7 °C | 175 mm | +5 mm |
| Jul | 28.2 °C | +2.7 °C | 43 mm | -161 mm |
| Aug | 29.2 °C | +1.8 °C | 306 mm | +174 mm |
| Sep | 27.2 °C | +2.8 °C | 227 mm | +37 mm |
| Oct | 21.6 °C | +1.9 °C | 160 mm | +43 mm |
| Nov | 16.2 °C | +0.9 °C | 74 mm | -45 mm |
| Dec | 12.0 °C | +1.5 °C | 147 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 Hiratachō?
Hiratachō has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.5 °C and it receives 1,725 mm of precipitation per year.
What is the hottest day ever recorded in Hiratachō?
The hottest day measured in Hiratachō between 1940 and 2025 was 11 August 1994, reaching 32.5 °C.
What is the coldest day in Hiratachō?
The coldest day measured in Hiratachō between 1940 and 2025 was 26 February 1981, at -5.2 °C.
Does it snow in Hiratachō?
Yes. Hiratachō gets on average 54.7 cm of snow per year and has around 2 frost days.
Has the climate of Hiratachō warmed?
Yes: Hiratachō warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hiratachō?
The wettest day measured in Hiratachō between 1940 and 2025 was 10 August 2025, with 171 mm of rain in 24 hours.
What was the windiest day in Hiratachō?
The windiest day measured in Hiratachō between 1940 and 2025 was 26 September 1954, with winds reaching 94.5 km/h.
What is the warmest month in Hiratachō?
The warmest month in Hiratachō is August (26.3 °C on average); the coldest is January (6.1 °C).
How much does it rain in Hiratachō?
Hiratachō receives on average 1,725 mm of precipitation per year, spread over about 177 rainy days.
Is it sunny in Hiratachō?
Hiratachō gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hiratachō?
The heaviest 24-hour snowfall measured in Hiratachō between 1940 and 2025 was 30 December 1960, with 18.2 cm.
Are there tropical nights in Hiratachō?
Yes: Hiratachō has on average 99 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hiratachō?
In Hiratachō, between 1940 and 2025, the highest apparent temperature reached 39.5 °C on 5 August 2010, and the lowest was -17.7 °C on 26 February 1981.
Compare Hiratachō with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hiratachō