Suzhou climate — normals and trends
Suzhou (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.7 °C and it receives 1,457 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 (28.8 °C on average) and the coldest is January (4.0 °C). Rainfall peaks in June.
Suzhou averages 20 frost days, 57 hot days (≥ 30 °C) and 131 rainy days per year.
Suzhou has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The number of frost days there went from about 28 to 12 per year over the period.
The hottest day of the period reached 38.8 °C (on 6 August 2013) and the coldest -9.2 °C (on 6 February 1969).
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
SuzhouJiangsu
- coords
- 31.30°, 120.60°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.7°C
Average daily high
19.6°C
Average daily low
14.1°C
Annual rainfall
1,457mm
Sunshine / day
7.9h
Mean relative humidity
77%
Average peak wind
19.6km/h
Seasonal range
24.8°C
Frost days (< 0 °C)
20 d/yr
Hot days (≥ 30 °C)
57 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
9.2 cm
Average feels-like high
19.9 °C
Average feels-like low
13.2 °C
Average peak gust
32.1 km/h
Tropical nights (≥ 20 °C)
119 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.32 · 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
38.8 °C
6 August 2013
Coldest day
-9.2 °C
6 February 1969
Wettest day
174 mm
10 June 1953
Windiest day
59.9 km/h
8 August 2012
Strongest gust
118.1 km/h
2 August 1956
Hottest feels-like
47.0 °C
1 August 2003
Coldest feels-like
-16.8 °C
24 January 2016
Snowiest day
29.2 cm
18 January 1984
Sunniest day
14.0 h
20 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 | 9.4 °C | +2.7 °C | 12 mm | -47 mm |
| Feb | 8.8 °C | +0.4 °C | 29 mm | -53 mm |
| Mar | 15.9 °C | +2.7 °C | 102 mm | -16 mm |
| Apr | 23.1 °C | +3.9 °C | 53 mm | -81 mm |
| May | 26.2 °C | +2.1 °C | 142 mm | -20 mm |
| Jun | 28.6 °C | +1.1 °C | 351 mm | +74 mm |
| Jul | 32.3 °C | +0.7 °C | 191 mm | +8 mm |
| Aug | 33.6 °C | +2.4 °C | 115 mm | -24 mm |
| Sep | 30.3 °C | +3.4 °C | 177 mm | +48 mm |
| Oct | 24.2 °C | +2.6 °C | 46 mm | -21 mm |
| Nov | 16.4 °C | +0.7 °C | 21 mm | -40 mm |
| Dec | 12.0 °C | +2.7 °C | 10 mm | -37 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 climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.7 °C and it receives 1,457 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 6 August 2013, reaching 38.8 °C.
What is the coldest day in Suzhou?
The coldest day measured in Suzhou between 1940 and 2025 was 6 February 1969, at -9.2 °C.
Does it snow in Suzhou?
Yes. Suzhou gets on average 9.2 cm of snow per year and has around 20 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 10 June 1953, with 174 mm of rain in 24 hours.
What was the windiest day in Suzhou?
The windiest day measured in Suzhou between 1940 and 2025 was 8 August 2012, with winds reaching 59.9 km/h.
What is the warmest month in Suzhou?
The warmest month in Suzhou is July (28.8 °C on average); the coldest is January (4.0 °C).
How much does it rain in Suzhou?
Suzhou receives on average 1,457 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Suzhou?
Suzhou gets on average 7.9 hours of sunshine per day, roughly 2,884 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 18 January 1984, with 29.2 cm.
Are there tropical nights in Suzhou?
Yes: Suzhou has on average 119 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 47.0 °C on 1 August 2003, and the lowest was -16.8 °C on 24 January 2016.
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