Ruidian climate — normals and trends
Ruidian (China) has a subtropical highland, dry winter climate (Cwb) under the Köppen-Geiger classification. Its mean annual temperature is 11.9 °C and it receives 2,974 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 (17.2 °C on average) and the coldest is January (4.8 °C). Rainfall peaks in July.
Ruidian averages 54 frost days, 0 hot days (≥ 30 °C) and 230 rainy days per year.
Ruidian has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 67 to 41 per year over the period.
The hottest day of the period reached 26.7 °C (on 25 June 2011) and the coldest -12.0 °C (on 18 February 1945).
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
RuidianYunnan
- coords
- 25.53°, 98.41°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.9°C
Average daily high
17.3°C
Average daily low
7.5°C
Annual rainfall
2,974mm
Sunshine / day
8.9h
Mean relative humidity
83%
Average peak wind
7.9km/h
Seasonal range
12.4°C
Frost days (< 0 °C)
54 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
230 d/yr
Annual snowfall
12.7 cm
Average feels-like high
17.3 °C
Average feels-like low
6.5 °C
Average peak gust
36.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
15.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.73 · 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
26.7 °C
25 June 2011
Coldest day
-12.0 °C
18 February 1945
Wettest day
133 mm
28 July 1989
Windiest day
20.8 km/h
4 March 1946
Strongest gust
88.2 km/h
23 February 1967
Hottest feels-like
31.6 °C
13 August 2024
Coldest feels-like
-16.4 °C
9 February 1977
Snowiest day
20.9 cm
27 December 1983
Sunniest day
13.0 h
11 May 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 | 14.0 °C | +2.0 °C | 41 mm | -21 mm |
| Feb | 13.8 °C | +0.9 °C | 66 mm | -44 mm |
| Mar | 15.6 °C | +0.2 °C | 259 mm | +67 mm |
| Apr | 18.7 °C | +1.2 °C | 231 mm | -31 mm |
| May | 19.3 °C | -0.1 °C | 473 mm | +167 mm |
| Jun | 21.9 °C | +1.5 °C | 550 mm | +65 mm |
| Jul | 22.7 °C | +2.4 °C | 470 mm | -71 mm |
| Aug | 21.4 °C | +0.3 °C | 394 mm | -20 mm |
| Sep | 22.7 °C | +1.8 °C | 238 mm | -43 mm |
| Oct | 20.7 °C | +1.7 °C | 205 mm | -3 mm |
| Nov | 17.3 °C | +1.3 °C | 81 mm | +9 mm |
| Dec | 15.1 °C | +1.9 °C | 0 mm | -42 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 Ruidian?
Ruidian has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 11.9 °C and it receives 2,974 mm of precipitation per year.
What is the hottest day ever recorded in Ruidian?
The hottest day measured in Ruidian between 1940 and 2025 was 25 June 2011, reaching 26.7 °C.
What is the coldest day in Ruidian?
The coldest day measured in Ruidian between 1940 and 2025 was 18 February 1945, at -12.0 °C.
Does it snow in Ruidian?
Yes. Ruidian gets on average 12.7 cm of snow per year and has around 54 frost days.
Has the climate of Ruidian warmed?
Yes: Ruidian warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ruidian?
The wettest day measured in Ruidian between 1940 and 2025 was 28 July 1989, with 133 mm of rain in 24 hours.
What was the windiest day in Ruidian?
The windiest day measured in Ruidian between 1940 and 2025 was 4 March 1946, with winds reaching 20.8 km/h.
What is the warmest month in Ruidian?
The warmest month in Ruidian is August (17.2 °C on average); the coldest is January (4.8 °C).
How much does it rain in Ruidian?
Ruidian receives on average 2,974 mm of precipitation per year, spread over about 230 rainy days.
Is it sunny in Ruidian?
Ruidian gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ruidian?
The heaviest 24-hour snowfall measured in Ruidian between 1940 and 2025 was 27 December 1983, with 20.9 cm.
Are there tropical nights in Ruidian?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ruidian.
What was the most extreme apparent temperature in Ruidian?
In Ruidian, between 1940 and 2025, the highest apparent temperature reached 31.6 °C on 13 August 2024, and the lowest was -16.4 °C on 9 February 1977.
Compare Ruidian with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ruidian