Ya'an climate — normals and trends
Ya'an (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.3 °C and it receives 1,862 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 July (23.3 °C on average) and the coldest is January (3.7 °C). Rainfall peaks in August.
Ya'an averages 21 frost days, 7 hot days (≥ 30 °C) and 223 rainy days per year.
Ya'an has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The number of frost days there went from about 33 to 9 per year over the period.
The hottest day of the period reached 34.6 °C (on 6 July 2022) and the coldest -16.4 °C (on 9 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
Ya'anSichuan
- coords
- 29.99°, 103.00°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.3°C
Average daily high
17.5°C
Average daily low
11.5°C
Annual rainfall
1,862mm
Sunshine / day
6.7h
Mean relative humidity
82%
Average peak wind
6.3km/h
Seasonal range
19.6°C
Frost days (< 0 °C)
21 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
223 d/yr
Annual snowfall
22.9 cm
Average feels-like high
18.2 °C
Average feels-like low
11.4 °C
Average peak gust
21.9 km/h
Tropical nights (≥ 20 °C)
47 d/yr
Solar radiation
11.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.39 · 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
34.6 °C
6 July 2022
Coldest day
-16.4 °C
9 February 1945
Wettest day
357 mm
29 July 1946
Windiest day
20.8 km/h
29 May 1946
Strongest gust
63.7 km/h
26 July 1989
Hottest feels-like
40.6 °C
16 July 2025
Coldest feels-like
-20.9 °C
9 February 1945
Snowiest day
6.0 cm
5 January 1970
Sunniest day
13.8 h
12 June 2025
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 | 9.2 °C | +2.3 °C | 59 mm | +10 mm |
| Feb | 8.5 °C | -0.5 °C | 98 mm | +39 mm |
| Mar | 13.2 °C | -0.7 °C | 97 mm | +12 mm |
| Apr | 21.4 °C | +2.6 °C | 94 mm | -21 mm |
| May | 23.8 °C | +1.6 °C | 109 mm | -33 mm |
| Jun | 26.8 °C | +2.3 °C | 124 mm | -71 mm |
| Jul | 29.0 °C | +2.4 °C | 272 mm | -89 mm |
| Aug | 28.2 °C | +1.9 °C | 344 mm | -30 mm |
| Sep | 24.4 °C | +2.1 °C | 236 mm | +9 mm |
| Oct | 18.9 °C | +1.2 °C | 167 mm | +46 mm |
| Nov | 13.8 °C | +0.3 °C | 61 mm | -23 mm |
| Dec | 10.9 °C | +2.3 °C | 31 mm | -20 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 Ya'an?
Ya'an has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.3 °C and it receives 1,862 mm of precipitation per year.
What is the hottest day ever recorded in Ya'an?
The hottest day measured in Ya'an between 1940 and 2025 was 6 July 2022, reaching 34.6 °C.
What is the coldest day in Ya'an?
The coldest day measured in Ya'an between 1940 and 2025 was 9 February 1945, at -16.4 °C.
Does it snow in Ya'an?
Yes. Ya'an gets on average 22.9 cm of snow per year and has around 21 frost days.
Has the climate of Ya'an warmed?
Yes: Ya'an warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ya'an?
The wettest day measured in Ya'an between 1940 and 2025 was 29 July 1946, with 357 mm of rain in 24 hours.
What was the windiest day in Ya'an?
The windiest day measured in Ya'an between 1940 and 2025 was 29 May 1946, with winds reaching 20.8 km/h.
What is the warmest month in Ya'an?
The warmest month in Ya'an is July (23.3 °C on average); the coldest is January (3.7 °C).
How much does it rain in Ya'an?
Ya'an receives on average 1,862 mm of precipitation per year, spread over about 223 rainy days.
Is it sunny in Ya'an?
Ya'an 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 Ya'an?
The heaviest 24-hour snowfall measured in Ya'an between 1940 and 2025 was 5 January 1970, with 6.0 cm.
Are there tropical nights in Ya'an?
Yes: Ya'an has on average 47 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ya'an?
In Ya'an, between 1940 and 2025, the highest apparent temperature reached 40.6 °C on 16 July 2025, and the lowest was -20.9 °C on 9 February 1945.
Compare Ya'an with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ya'an