Nagato climate — normals and trends
Nagato (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.0 °C and it receives 1,606 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 (27.3 °C on average) and the coldest is January (5.8 °C). Rainfall peaks in July.
Nagato averages 6 frost days, 34 hot days (≥ 30 °C) and 143 rainy days per year.
Nagato has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 12 to 0 per year over the period.
The hottest day of the period reached 36.8 °C (on 20 July 2018) and the coldest -5.7 °C (on 16 February 1977).
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
NagatoYamaguchi
- coords
- 34.38°, 131.20°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.0°C
Average daily high
19.1°C
Average daily low
13.1°C
Annual rainfall
1,606mm
Sunshine / day
8.7h
Mean relative humidity
72%
Average peak wind
21.2km/h
Seasonal range
21.5°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
34 d/yr
Rainy days (≥ 1 mm)
143 d/yr
Annual snowfall
12.0 cm
Average feels-like high
18.4 °C
Average feels-like low
11.6 °C
Average peak gust
41.6 km/h
Tropical nights (≥ 20 °C)
90 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.68 · 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
36.8 °C
20 July 2018
Coldest day
-5.7 °C
16 February 1977
Wettest day
188 mm
10 October 1945
Windiest day
69.9 km/h
27 September 1991
Strongest gust
169.2 km/h
7 September 2004
Hottest feels-like
43.6 °C
20 July 2018
Coldest feels-like
-14.9 °C
26 February 1981
Snowiest day
18.6 cm
15 February 1968
Sunniest day
13.9 h
8 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 | 8.9 °C | +0.6 °C | 28 mm | -43 mm |
| Feb | 7.3 °C | -1.8 °C | 54 mm | -24 mm |
| Mar | 13.6 °C | +1.1 °C | 149 mm | +45 mm |
| Apr | 18.5 °C | +0.9 °C | 63 mm | -60 mm |
| May | 21.6 °C | -0.2 °C | 184 mm | +50 mm |
| Jun | 26.5 °C | +1.6 °C | 232 mm | +11 mm |
| Jul | 32.6 °C | +3.9 °C | 85 mm | -172 mm |
| Aug | 31.8 °C | +1.2 °C | 250 mm | +84 mm |
| Sep | 29.2 °C | +2.6 °C | 242 mm | +42 mm |
| Oct | 23.6 °C | +2.0 °C | 115 mm | +16 mm |
| Nov | 17.3 °C | +0.9 °C | 35 mm | -48 mm |
| Dec | 12.5 °C | +1.5 °C | 75 mm | +6 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 Nagato?
Nagato has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.0 °C and it receives 1,606 mm of precipitation per year.
What is the hottest day ever recorded in Nagato?
The hottest day measured in Nagato between 1940 and 2025 was 20 July 2018, reaching 36.8 °C.
What is the coldest day in Nagato?
The coldest day measured in Nagato between 1940 and 2025 was 16 February 1977, at -5.7 °C.
Does it snow in Nagato?
Yes. Nagato gets on average 12.0 cm of snow per year and has around 6 frost days.
Has the climate of Nagato warmed?
Yes: Nagato warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nagato?
The wettest day measured in Nagato between 1940 and 2025 was 10 October 1945, with 188 mm of rain in 24 hours.
What was the windiest day in Nagato?
The windiest day measured in Nagato between 1940 and 2025 was 27 September 1991, with winds reaching 69.9 km/h.
What is the warmest month in Nagato?
The warmest month in Nagato is August (27.3 °C on average); the coldest is January (5.8 °C).
How much does it rain in Nagato?
Nagato receives on average 1,606 mm of precipitation per year, spread over about 143 rainy days.
Is it sunny in Nagato?
Nagato 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 Nagato?
The heaviest 24-hour snowfall measured in Nagato between 1940 and 2025 was 15 February 1968, with 18.6 cm.
Are there tropical nights in Nagato?
Yes: Nagato has on average 90 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nagato?
In Nagato, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 20 July 2018, and the lowest was -14.9 °C on 26 February 1981.
Compare Nagato with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nagato