Nakano climate — normals and trends
Nakano (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.3 °C and it receives 1,869 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 (22.3 °C on average) and the coldest is January (-3.2 °C). Rainfall peaks in July.
Nakano averages 132 frost days, 7 hot days (≥ 30 °C) and 225 rainy days per year.
Nakano has warmed by +3.1 °C between 1940 and 2025, or +0.36 °C per decade. This trend is statistically significant.
The number of frost days there went from about 151 to 113 per year over the period.
The hottest day of the period reached 34.7 °C (on 22 August 2018) and the coldest -18.1 °C (on 17 January 1949).
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
NakanoNagano
- coords
- 36.75°, 138.37°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.3°C
Average daily high
13.9°C
Average daily low
5.2°C
Annual rainfall
1,869mm
Sunshine / day
8.6h
Mean relative humidity
79%
Average peak wind
9.0km/h
Seasonal range
25.5°C
Frost days (< 0 °C)
132 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
225 d/yr
Annual snowfall
288.8 cm
Average feels-like high
13.1 °C
Average feels-like low
3.7 °C
Average peak gust
33.6 km/h
Tropical nights (≥ 20 °C)
14 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.71 · 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
34.7 °C
22 August 2018
Coldest day
-18.1 °C
17 January 1949
Wettest day
143 mm
12 October 2019
Windiest day
39.1 km/h
16 September 1961
Strongest gust
170.3 km/h
27 September 1959
Hottest feels-like
38.9 °C
15 July 2018
Coldest feels-like
-22.5 °C
17 January 1942
Snowiest day
46.5 cm
15 February 2014
Sunniest day
14.0 h
11 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 | 1.7 °C | +0.9 °C | 108 mm | -26 mm |
| Feb | 0.6 °C | -1.0 °C | 128 mm | +9 mm |
| Mar | 6.7 °C | +1.1 °C | 137 mm | +10 mm |
| Apr | 14.8 °C | +2.1 °C | 109 mm | -4 mm |
| May | 19.3 °C | +0.5 °C | 137 mm | +3 mm |
| Jun | 24.3 °C | +2.3 °C | 205 mm | +0 mm |
| Jul | 29.5 °C | +4.0 °C | 112 mm | -145 mm |
| Aug | 28.9 °C | +2.0 °C | 243 mm | +59 mm |
| Sep | 25.3 °C | +2.8 °C | 192 mm | -8 mm |
| Oct | 17.2 °C | +0.8 °C | 197 mm | +48 mm |
| Nov | 11.1 °C | +0.7 °C | 97 mm | -18 mm |
| Dec | 5.7 °C | +1.8 °C | 162 mm | +30 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 Nakano?
Nakano has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.3 °C and it receives 1,869 mm of precipitation per year.
What is the hottest day ever recorded in Nakano?
The hottest day measured in Nakano between 1940 and 2025 was 22 August 2018, reaching 34.7 °C.
What is the coldest day in Nakano?
The coldest day measured in Nakano between 1940 and 2025 was 17 January 1949, at -18.1 °C.
Does it snow in Nakano?
Yes. Nakano gets on average 288.8 cm of snow per year and has around 132 frost days.
Has the climate of Nakano warmed?
Yes: Nakano warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nakano?
The wettest day measured in Nakano between 1940 and 2025 was 12 October 2019, with 143 mm of rain in 24 hours.
What was the windiest day in Nakano?
The windiest day measured in Nakano between 1940 and 2025 was 16 September 1961, with winds reaching 39.1 km/h.
What is the warmest month in Nakano?
The warmest month in Nakano is August (22.3 °C on average); the coldest is January (-3.2 °C).
How much does it rain in Nakano?
Nakano receives on average 1,869 mm of precipitation per year, spread over about 225 rainy days.
Is it sunny in Nakano?
Nakano 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 Nakano?
The heaviest 24-hour snowfall measured in Nakano between 1940 and 2025 was 15 February 2014, with 46.5 cm.
Are there tropical nights in Nakano?
Yes: Nakano has on average 14 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nakano?
In Nakano, between 1940 and 2025, the highest apparent temperature reached 38.9 °C on 15 July 2018, and the lowest was -22.5 °C on 17 January 1942.
Compare Nakano with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nakano