Izumo climate — normals and trends
Izumo (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.6 °C and it receives 1,573 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 (26.5 °C on average) and the coldest is January (3.9 °C). Rainfall peaks in July.
Izumo averages 23 frost days, 26 hot days (≥ 30 °C) and 171 rainy days per year.
Izumo 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 42 to 4 per year over the period.
The hottest day of the period reached 35.8 °C (on 9 August 1994) and the coldest -10.9 °C (on 14 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
IzumoShimane
- coords
- 35.37°, 132.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.6°C
Average daily high
17.7°C
Average daily low
11.6°C
Annual rainfall
1,573mm
Sunshine / day
8.7h
Mean relative humidity
76%
Average peak wind
18.0km/h
Seasonal range
22.6°C
Frost days (< 0 °C)
23 d/yr
Hot days (≥ 30 °C)
26 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
59.2 cm
Average feels-like high
17.2 °C
Average feels-like low
10.3 °C
Average peak gust
40.1 km/h
Tropical nights (≥ 20 °C)
79 d/yr
Solar radiation
14.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.67 · 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
35.8 °C
9 August 1994
Coldest day
-10.9 °C
14 February 1942
Wettest day
176 mm
11 July 1972
Windiest day
62.9 km/h
7 September 2004
Strongest gust
164.9 km/h
7 September 2004
Hottest feels-like
42.8 °C
20 July 2018
Coldest feels-like
-16.4 °C
26 February 1981
Snowiest day
35.3 cm
16 March 1965
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 | 7.1 °C | +0.6 °C | 71 mm | -25 mm |
| Feb | 5.2 °C | -1.8 °C | 77 mm | -13 mm |
| Mar | 11.6 °C | +1.0 °C | 156 mm | +49 mm |
| Apr | 17.0 °C | +1.0 °C | 68 mm | -42 mm |
| May | 20.9 °C | +0.4 °C | 162 mm | +39 mm |
| Jun | 26.5 °C | +2.5 °C | 161 mm | -17 mm |
| Jul | 31.7 °C | +3.7 °C | 77 mm | -147 mm |
| Aug | 30.8 °C | +1.3 °C | 288 mm | +130 mm |
| Sep | 27.7 °C | +2.2 °C | 179 mm | -18 mm |
| Oct | 21.7 °C | +1.6 °C | 150 mm | +44 mm |
| Nov | 15.6 °C | +0.7 °C | 45 mm | -44 mm |
| Dec | 10.5 °C | +1.0 °C | 98 mm | +3 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 Izumo?
Izumo has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.6 °C and it receives 1,573 mm of precipitation per year.
What is the hottest day ever recorded in Izumo?
The hottest day measured in Izumo between 1940 and 2025 was 9 August 1994, reaching 35.8 °C.
What is the coldest day in Izumo?
The coldest day measured in Izumo between 1940 and 2025 was 14 February 1942, at -10.9 °C.
Does it snow in Izumo?
Yes. Izumo gets on average 59.2 cm of snow per year and has around 23 frost days.
Has the climate of Izumo warmed?
Yes: Izumo warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Izumo?
The wettest day measured in Izumo between 1940 and 2025 was 11 July 1972, with 176 mm of rain in 24 hours.
What was the windiest day in Izumo?
The windiest day measured in Izumo between 1940 and 2025 was 7 September 2004, with winds reaching 62.9 km/h.
What is the warmest month in Izumo?
The warmest month in Izumo is August (26.5 °C on average); the coldest is January (3.9 °C).
How much does it rain in Izumo?
Izumo receives on average 1,573 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Izumo?
Izumo gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Izumo?
The heaviest 24-hour snowfall measured in Izumo between 1940 and 2025 was 16 March 1965, with 35.3 cm.
Are there tropical nights in Izumo?
Yes: Izumo has on average 79 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Izumo?
In Izumo, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 20 July 2018, and the lowest was -16.4 °C on 26 February 1981.
Compare Izumo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Izumo