Yoichi climate — normals and trends
Yoichi (Japan) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.4 °C and it receives 1,224 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 (21.0 °C on average) and the coldest is January (-4.6 °C). Rainfall peaks in August.
Yoichi averages 134 frost days, 0 hot days (≥ 30 °C) and 191 rainy days per year.
Yoichi has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 151 to 117 per year over the period.
The hottest day of the period reached 30.6 °C (on 23 August 2023) and the coldest -14.8 °C (on 20 January 1966).
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
YoichiHokkaido
- coords
- 43.20°, 140.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.4°C
Average daily high
9.8°C
Average daily low
5.0°C
Annual rainfall
1,224mm
Sunshine / day
8.7h
Mean relative humidity
78%
Average peak wind
19.9km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
134 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
191 d/yr
Annual snowfall
293.7 cm
Average feels-like high
7.6 °C
Average feels-like low
1.7 °C
Average peak gust
41.4 km/h
Tropical nights (≥ 20 °C)
14 d/yr
Solar radiation
13.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.63 · 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
30.6 °C
23 August 2023
Coldest day
-14.8 °C
20 January 1966
Wettest day
130 mm
23 August 1975
Windiest day
64.8 km/h
8 September 2004
Strongest gust
155.2 km/h
27 September 1954
Hottest feels-like
37.1 °C
7 August 2021
Coldest feels-like
-23.9 °C
14 January 1967
Snowiest day
29.3 cm
5 December 2004
Sunniest day
15.0 h
10 June 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 | 0.0 °C | +2.8 °C | 134 mm | +34 mm |
| Feb | 0.8 °C | +3.0 °C | 144 mm | +60 mm |
| Mar | 3.1 °C | +1.7 °C | 115 mm | +37 mm |
| Apr | 8.8 °C | +2.0 °C | 93 mm | +21 mm |
| May | 15.9 °C | +3.0 °C | 52 mm | -27 mm |
| Jun | 20.9 °C | +3.5 °C | 91 mm | +20 mm |
| Jul | 26.5 °C | +4.8 °C | 95 mm | -6 mm |
| Aug | 25.8 °C | +2.4 °C | 177 mm | +35 mm |
| Sep | 22.9 °C | +3.1 °C | 206 mm | +67 mm |
| Oct | 13.7 °C | +0.3 °C | 122 mm | +2 mm |
| Nov | 7.5 °C | +1.8 °C | 173 mm | +52 mm |
| Dec | 1.5 °C | +1.9 °C | 171 mm | +53 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 Yoichi?
Yoichi has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.4 °C and it receives 1,224 mm of precipitation per year.
What is the hottest day ever recorded in Yoichi?
The hottest day measured in Yoichi between 1940 and 2025 was 23 August 2023, reaching 30.6 °C.
What is the coldest day in Yoichi?
The coldest day measured in Yoichi between 1940 and 2025 was 20 January 1966, at -14.8 °C.
Does it snow in Yoichi?
Yes. Yoichi gets on average 293.7 cm of snow per year and has around 134 frost days.
Has the climate of Yoichi warmed?
Yes: Yoichi warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Yoichi?
The wettest day measured in Yoichi between 1940 and 2025 was 23 August 1975, with 130 mm of rain in 24 hours.
What was the windiest day in Yoichi?
The windiest day measured in Yoichi between 1940 and 2025 was 8 September 2004, with winds reaching 64.8 km/h.
What is the warmest month in Yoichi?
The warmest month in Yoichi is August (21.0 °C on average); the coldest is January (-4.6 °C).
How much does it rain in Yoichi?
Yoichi receives on average 1,224 mm of precipitation per year, spread over about 191 rainy days.
Is it sunny in Yoichi?
Yoichi 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 Yoichi?
The heaviest 24-hour snowfall measured in Yoichi between 1940 and 2025 was 5 December 2004, with 29.3 cm.
Are there tropical nights in Yoichi?
Yes: Yoichi has on average 14 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Yoichi?
In Yoichi, between 1940 and 2025, the highest apparent temperature reached 37.1 °C on 7 August 2021, and the lowest was -23.9 °C on 14 January 1967.
Compare Yoichi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Yoichi