Suzhou climate — normals and trends
Suzhou (China) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 15.0 °C and it receives 1,024 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 (27.5 °C on average) and the coldest is January (0.8 °C). Rainfall peaks in July.
Suzhou averages 67 frost days, 67 hot days (≥ 30 °C) and 95 rainy days per year.
Suzhou has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 79 to 55 per year over the period.
The hottest day of the period reached 41.1 °C (on 11 August 1946) and the coldest -24.4 °C (on 11 January 1955).
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
SuzhouAnhui
- coords
- 33.64°, 116.98°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.0°C
Average daily high
19.6°C
Average daily low
10.8°C
Annual rainfall
1,024mm
Sunshine / day
8.4h
Mean relative humidity
71%
Average peak wind
14.6km/h
Seasonal range
26.7°C
Frost days (< 0 °C)
67 d/yr
Hot days (≥ 30 °C)
67 d/yr
Rainy days (≥ 1 mm)
95 d/yr
Annual snowfall
16.1 cm
Average feels-like high
19.3 °C
Average feels-like low
9.8 °C
Average peak gust
30.6 km/h
Tropical nights (≥ 20 °C)
90 d/yr
Solar radiation
15.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.24 · 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
41.1 °C
11 August 1946
Coldest day
-24.4 °C
11 January 1955
Wettest day
225 mm
19 July 1990
Windiest day
43.4 km/h
9 July 1949
Strongest gust
85.0 km/h
28 July 2021
Hottest feels-like
46.2 °C
21 July 1971
Coldest feels-like
-29.8 °C
11 January 1955
Snowiest day
14.5 cm
24 February 1952
Sunniest day
13.9 h
12 June 2024
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 | 9.0 °C | +3.6 °C | 15 mm | -7 mm |
| Feb | 9.6 °C | +1.7 °C | 8 mm | -23 mm |
| Mar | 16.6 °C | +3.1 °C | 53 mm | +5 mm |
| Apr | 25.2 °C | +4.9 °C | 21 mm | -42 mm |
| May | 27.9 °C | +2.0 °C | 45 mm | -37 mm |
| Jun | 31.3 °C | +0.9 °C | 159 mm | +29 mm |
| Jul | 34.9 °C | +3.7 °C | 33 mm | -248 mm |
| Aug | 32.8 °C | +2.2 °C | 222 mm | +69 mm |
| Sep | 26.1 °C | -0.3 °C | 260 mm | +152 mm |
| Oct | 19.8 °C | -1.7 °C | 134 mm | +83 mm |
| Nov | 17.5 °C | +3.1 °C | 14 mm | -22 mm |
| Dec | 10.8 °C | +3.0 °C | 14 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 Suzhou?
Suzhou has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 15.0 °C and it receives 1,024 mm of precipitation per year.
What is the hottest day ever recorded in Suzhou?
The hottest day measured in Suzhou between 1940 and 2025 was 11 August 1946, reaching 41.1 °C.
What is the coldest day in Suzhou?
The coldest day measured in Suzhou between 1940 and 2025 was 11 January 1955, at -24.4 °C.
Does it snow in Suzhou?
Yes. Suzhou gets on average 16.1 cm of snow per year and has around 67 frost days.
Has the climate of Suzhou warmed?
Yes: Suzhou warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Suzhou?
The wettest day measured in Suzhou between 1940 and 2025 was 19 July 1990, with 225 mm of rain in 24 hours.
What was the windiest day in Suzhou?
The windiest day measured in Suzhou between 1940 and 2025 was 9 July 1949, with winds reaching 43.4 km/h.
What is the warmest month in Suzhou?
The warmest month in Suzhou is July (27.5 °C on average); the coldest is January (0.8 °C).
How much does it rain in Suzhou?
Suzhou receives on average 1,024 mm of precipitation per year, spread over about 95 rainy days.
Is it sunny in Suzhou?
Suzhou gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Suzhou?
The heaviest 24-hour snowfall measured in Suzhou between 1940 and 2025 was 24 February 1952, with 14.5 cm.
Are there tropical nights in Suzhou?
Yes: Suzhou has on average 90 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Suzhou?
In Suzhou, between 1940 and 2025, the highest apparent temperature reached 46.2 °C on 21 July 1971, and the lowest was -29.8 °C on 11 January 1955.
Compare Suzhou with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Suzhou