Nanmen climate — normals and trends
Nanmen (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.4 °C and it receives 1,789 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 (27.5 °C on average) and the coldest is January (6.6 °C). Rainfall peaks in July.
Nanmen averages 4 frost days, 64 hot days (≥ 30 °C) and 171 rainy days per year.
Nanmen has warmed by +1.0 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The number of frost days there went from about 7 to 1 per year over the period.
The hottest day of the period reached 40.3 °C (on 3 August 2025) and the coldest -9.5 °C (on 20 December 1965).
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
NanmenChongqing Municipality
- coords
- 30.96°, 108.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.4°C
Average daily high
20.8°C
Average daily low
14.4°C
Annual rainfall
1,789mm
Sunshine / day
6.7h
Mean relative humidity
76%
Average peak wind
7.5km/h
Seasonal range
20.9°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
64 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
5.6 cm
Average feels-like high
22.0 °C
Average feels-like low
14.8 °C
Average peak gust
23.8 km/h
Tropical nights (≥ 20 °C)
109 d/yr
Solar radiation
12.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.30 · 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
40.3 °C
3 August 2025
Coldest day
-9.5 °C
20 December 1965
Wettest day
161 mm
30 June 1991
Windiest day
28.5 km/h
28 May 1946
Strongest gust
70.9 km/h
17 June 1946
Hottest feels-like
46.6 °C
25 July 1957
Coldest feels-like
-13.0 °C
20 December 1965
Snowiest day
13.9 cm
22 February 1989
Sunniest day
13.8 h
29 June 2011
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 | 11.4 °C | +2.0 °C | 55 mm | +10 mm |
| Feb | 11.3 °C | -0.1 °C | 28 mm | -28 mm |
| Mar | 16.7 °C | +0.3 °C | 118 mm | +4 mm |
| Apr | 24.8 °C | +3.2 °C | 92 mm | -68 mm |
| May | 28.2 °C | +3.0 °C | 83 mm | -122 mm |
| Jun | 29.5 °C | +1.3 °C | 186 mm | -25 mm |
| Jul | 35.5 °C | +4.4 °C | 80 mm | -198 mm |
| Aug | 34.1 °C | +2.6 °C | 166 mm | -37 mm |
| Sep | 28.7 °C | +1.9 °C | 250 mm | +38 mm |
| Oct | 22.8 °C | +1.8 °C | 293 mm | +143 mm |
| Nov | 16.5 °C | +0.7 °C | 68 mm | -32 mm |
| Dec | 13.1 °C | +2.4 °C | 56 mm | +1 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 Nanmen?
Nanmen has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.4 °C and it receives 1,789 mm of precipitation per year.
What is the hottest day ever recorded in Nanmen?
The hottest day measured in Nanmen between 1940 and 2025 was 3 August 2025, reaching 40.3 °C.
What is the coldest day in Nanmen?
The coldest day measured in Nanmen between 1940 and 2025 was 20 December 1965, at -9.5 °C.
Does it snow in Nanmen?
Yes. Nanmen gets on average 5.6 cm of snow per year and has around 4 frost days.
Has the climate of Nanmen warmed?
Yes: Nanmen warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nanmen?
The wettest day measured in Nanmen between 1940 and 2025 was 30 June 1991, with 161 mm of rain in 24 hours.
What was the windiest day in Nanmen?
The windiest day measured in Nanmen between 1940 and 2025 was 28 May 1946, with winds reaching 28.5 km/h.
What is the warmest month in Nanmen?
The warmest month in Nanmen is August (27.5 °C on average); the coldest is January (6.6 °C).
How much does it rain in Nanmen?
Nanmen receives on average 1,789 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Nanmen?
Nanmen gets on average 6.7 hours of sunshine per day, roughly 2,446 hours per year over 1940-2025.
What is the biggest single-day snowfall in Nanmen?
The heaviest 24-hour snowfall measured in Nanmen between 1940 and 2025 was 22 February 1989, with 13.9 cm.
Are there tropical nights in Nanmen?
Yes: Nanmen has on average 109 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nanmen?
In Nanmen, between 1940 and 2025, the highest apparent temperature reached 46.6 °C on 25 July 1957, and the lowest was -13.0 °C on 20 December 1965.
Compare Nanmen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nanmen