Hangzhou climate — normals and trends
Hangzhou (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.2 °C and it receives 1,494 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 (29.4 °C on average) and the coldest is January (4.6 °C). Rainfall peaks in June.
Hangzhou averages 26 frost days, 80 hot days (≥ 30 °C) and 140 rainy days per year.
Hangzhou has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 37 to 15 per year over the period.
The hottest day of the period reached 43.8 °C (on 3 August 2024) and the coldest -15.8 °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
HangzhouZhejiang
- coords
- 30.29°, 120.16°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.2°C
Average daily high
21.3°C
Average daily low
13.6°C
Annual rainfall
1,494mm
Sunshine / day
7.4h
Mean relative humidity
77%
Average peak wind
13.6km/h
Seasonal range
24.8°C
Frost days (< 0 °C)
26 d/yr
Hot days (≥ 30 °C)
80 d/yr
Rainy days (≥ 1 mm)
140 d/yr
Annual snowfall
14.3 cm
Average feels-like high
22.1 °C
Average feels-like low
13.7 °C
Average peak gust
28.6 km/h
Tropical nights (≥ 20 °C)
114 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.45 · 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
43.8 °C
3 August 2024
Coldest day
-15.8 °C
6 February 1969
Wettest day
151 mm
18 June 1954
Windiest day
52.0 km/h
11 September 2005
Strongest gust
120.2 km/h
2 August 1956
Hottest feels-like
49.3 °C
3 August 2024
Coldest feels-like
-20.5 °C
6 February 1969
Snowiest day
21.9 cm
22 January 1998
Sunniest day
14.0 h
20 June 1943
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 | 13.1 °C | +4.5 °C | 12 mm | -51 mm |
| Feb | 11.1 °C | +1.0 °C | 47 mm | -32 mm |
| Mar | 18.5 °C | +3.6 °C | 83 mm | -34 mm |
| Apr | 26.9 °C | +5.9 °C | 65 mm | -74 mm |
| May | 28.9 °C | +3.4 °C | 174 mm | -19 mm |
| Jun | 30.7 °C | +2.0 °C | 420 mm | +108 mm |
| Jul | 33.9 °C | +0.4 °C | 187 mm | +26 mm |
| Aug | 37.0 °C | +4.0 °C | 44 mm | -85 mm |
| Sep | 33.1 °C | +4.8 °C | 166 mm | +39 mm |
| Oct | 26.6 °C | +3.6 °C | 41 mm | -28 mm |
| Nov | 18.9 °C | +1.5 °C | 33 mm | -25 mm |
| Dec | 15.3 °C | +4.1 °C | 15 mm | -32 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 Hangzhou?
Hangzhou has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.2 °C and it receives 1,494 mm of precipitation per year.
What is the hottest day ever recorded in Hangzhou?
The hottest day measured in Hangzhou between 1940 and 2025 was 3 August 2024, reaching 43.8 °C.
What is the coldest day in Hangzhou?
The coldest day measured in Hangzhou between 1940 and 2025 was 6 February 1969, at -15.8 °C.
Does it snow in Hangzhou?
Yes. Hangzhou gets on average 14.3 cm of snow per year and has around 26 frost days.
Has the climate of Hangzhou warmed?
Yes: Hangzhou warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hangzhou?
The wettest day measured in Hangzhou between 1940 and 2025 was 18 June 1954, with 151 mm of rain in 24 hours.
What was the windiest day in Hangzhou?
The windiest day measured in Hangzhou between 1940 and 2025 was 11 September 2005, with winds reaching 52.0 km/h.
What is the warmest month in Hangzhou?
The warmest month in Hangzhou is July (29.4 °C on average); the coldest is January (4.6 °C).
How much does it rain in Hangzhou?
Hangzhou receives on average 1,494 mm of precipitation per year, spread over about 140 rainy days.
Is it sunny in Hangzhou?
Hangzhou gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hangzhou?
The heaviest 24-hour snowfall measured in Hangzhou between 1940 and 2025 was 22 January 1998, with 21.9 cm.
Are there tropical nights in Hangzhou?
Yes: Hangzhou has on average 114 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hangzhou?
In Hangzhou, between 1940 and 2025, the highest apparent temperature reached 49.3 °C on 3 August 2024, and the lowest was -20.5 °C on 6 February 1969.
Compare Hangzhou with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hangzhou