Ōno climate — normals and trends
Ōno (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 1,182 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 (22.1 °C on average) and the coldest is February (-0.7 °C). Rainfall peaks in September.
Ōno averages 85 frost days, 0 hot days (≥ 30 °C) and 143 rainy days per year.
Ōno 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 106 to 64 per year over the period.
The hottest day of the period reached 32.0 °C (on 11 August 2020) and the coldest -11.6 °C (on 9 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
ŌnoIwate
- coords
- 40.29°, 141.63°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.9°C
Average daily high
12.2°C
Average daily low
7.7°C
Annual rainfall
1,182mm
Sunshine / day
8.6h
Mean relative humidity
77%
Average peak wind
22.0km/h
Seasonal range
22.8°C
Frost days (< 0 °C)
85 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
143 d/yr
Annual snowfall
117.9 cm
Average feels-like high
10.2 °C
Average feels-like low
4.6 °C
Average peak gust
40.3 km/h
Tropical nights (≥ 20 °C)
30 d/yr
Solar radiation
13.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.61 · 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
32.0 °C
11 August 2020
Coldest day
-11.6 °C
9 February 1942
Wettest day
191 mm
15 September 1947
Windiest day
67.4 km/h
20 February 1955
Strongest gust
131.4 km/h
23 August 1981
Hottest feels-like
37.4 °C
24 August 2023
Coldest feels-like
-18.8 °C
9 February 1942
Snowiest day
45.9 cm
29 March 1966
Sunniest day
14.9 h
14 June 1942
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 | 4.0 °C | +2.2 °C | 53 mm | -10 mm |
| Feb | 3.6 °C | +1.8 °C | 33 mm | -30 mm |
| Mar | 7.1 °C | +2.2 °C | 113 mm | +32 mm |
| Apr | 11.0 °C | +0.9 °C | 104 mm | +20 mm |
| May | 15.4 °C | +1.1 °C | 112 mm | +16 mm |
| Jun | 21.1 °C | +3.9 °C | 93 mm | -15 mm |
| Jul | 25.9 °C | +4.5 °C | 49 mm | -93 mm |
| Aug | 27.4 °C | +3.5 °C | 57 mm | -90 mm |
| Sep | 24.1 °C | +2.9 °C | 144 mm | -19 mm |
| Oct | 16.6 °C | +0.8 °C | 109 mm | +0 mm |
| Nov | 11.0 °C | +1.4 °C | 133 mm | +68 mm |
| Dec | 6.5 °C | +2.1 °C | 80 mm | +18 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 Ōno?
Ōno has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 1,182 mm of precipitation per year.
What is the hottest day ever recorded in Ōno?
The hottest day measured in Ōno between 1940 and 2025 was 11 August 2020, reaching 32.0 °C.
What is the coldest day in Ōno?
The coldest day measured in Ōno between 1940 and 2025 was 9 February 1942, at -11.6 °C.
Does it snow in Ōno?
Yes. Ōno gets on average 117.9 cm of snow per year and has around 85 frost days.
Has the climate of Ōno warmed?
Yes: Ōno warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ōno?
The wettest day measured in Ōno between 1940 and 2025 was 15 September 1947, with 191 mm of rain in 24 hours.
What was the windiest day in Ōno?
The windiest day measured in Ōno between 1940 and 2025 was 20 February 1955, with winds reaching 67.4 km/h.
What is the warmest month in Ōno?
The warmest month in Ōno is August (22.1 °C on average); the coldest is February (-0.7 °C).
How much does it rain in Ōno?
Ōno receives on average 1,182 mm of precipitation per year, spread over about 143 rainy days.
Is it sunny in Ōno?
Ōno gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ōno?
The heaviest 24-hour snowfall measured in Ōno between 1940 and 2025 was 29 March 1966, with 45.9 cm.
Are there tropical nights in Ōno?
Yes: Ōno has on average 30 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ōno?
In Ōno, between 1940 and 2025, the highest apparent temperature reached 37.4 °C on 24 August 2023, and the lowest was -18.8 °C on 9 February 1942.
Compare Ōno with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ōno