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Suzhou, China climate
Cfa Humid subtropical
Suzhou has a strongly seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 32°C, while the coldest is January averaging around 0°C at night. Precipitation totals about 1046 mm a year and is strongly seasonal — July alone averages 180 mm while December barely receives 37 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsSuzhou climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 10 | 15 | 22 | 27 | 30 | 32 | 32 | 28 | 23 | 16 | 10 |
| Avg temp (°C) | 3 | 6 | 11 | 17 | 23 | 26 | 29 | 28 | 24 | 18 | 12 | 6 |
| Avg low (°C) | 0 | 2 | 6 | 12 | 18 | 22 | 25 | 25 | 20 | 14 | 7 | 2 |
| Precipitation (mm) | 47 | 51 | 82 | 80 | 90 | 162 | 180 | 140 | 65 | 56 | 54 | 37 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 10 | 15 | 22 | 27 | 30 |
| Avg temp (°C) | 3 | 6 | 11 | 17 | 23 | 26 |
| Avg low (°C) | 0 | 2 | 6 | 12 | 18 | 22 |
| Precipitation (mm) | 47 | 51 | 82 | 80 | 90 | 162 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 28 | 23 | 16 | 10 |
| Avg temp (°C) | 29 | 28 | 24 | 18 | 12 | 6 |
| Avg low (°C) | 25 | 25 | 20 | 14 | 7 | 2 |
| Precipitation (mm) | 180 | 140 | 65 | 56 | 54 | 37 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 10 | 9 | 10 | 10 | 11 | 12 | 8 | 8 | 8 | 7 |
| Days with high ≥ 32°C (days) | — | — | — | 0.3 | 3 | 8 | 17 | 17 | 4 | 0.4 | — | — |
| Days with low ≤ 0°C (days) | 16 | 8 | 1 | — | — | — | — | — | — | — | 1.0 | 10 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 10 | 9 | 10 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 0.3 | 3 | 8 |
| Days with low ≤ 0°C (days) | 16 | 8 | 1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 12 | 8 | 8 | 8 | 7 |
| Days with high ≥ 32°C (days) | 17 | 17 | 4 | 0.4 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 1.0 | 10 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 66 | 69 | 69 | 71 | 76 | 70 | 65 | 63 | 58 | 54 | 53 |
| Clear days (≤ 30% cloud) | 8 | 5 | 5 | 4 | 4 | 3 | 4 | 5 | 7 | 9 | 10 | 11 |
| Partly cloudy days (30–70%) | 8 | 8 | 8 | 9 | 8 | 7 | 8 | 11 | 8 | 9 | 8 | 8 |
| Cloudy days (≥ 70%) | 15 | 16 | 18 | 17 | 19 | 20 | 18 | 16 | 15 | 14 | 12 | 13 |
| Relative humidity (%) | 75 | 74 | 74 | 71 | 70 | 73 | 80 | 79 | 75 | 71 | 73 | 74 |
| Wind speed (mph) | 5.6 | 6.0 | 6.3 | 6.2 | 6.0 | 5.5 | 5.3 | 5.1 | 5.3 | 5.2 | 5.5 | 5.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 66 | 69 | 69 | 71 | 76 |
| Clear days (≤ 30% cloud) | 8 | 5 | 5 | 4 | 4 | 3 |
| Partly cloudy days (30–70%) | 8 | 8 | 8 | 9 | 8 | 7 |
| Cloudy days (≥ 70%) | 15 | 16 | 18 | 17 | 19 | 20 |
| Relative humidity (%) | 75 | 74 | 74 | 71 | 70 | 73 |
| Wind speed (mph) | 5.6 | 6.0 | 6.3 | 6.2 | 6.0 | 5.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 65 | 63 | 58 | 54 | 53 |
| Clear days (≤ 30% cloud) | 4 | 5 | 7 | 9 | 10 | 11 |
| Partly cloudy days (30–70%) | 8 | 11 | 8 | 9 | 8 | 8 |
| Cloudy days (≥ 70%) | 18 | 16 | 15 | 14 | 12 | 13 |
| Relative humidity (%) | 80 | 79 | 75 | 71 | 73 | 74 |
| Wind speed (mph) | 5.3 | 5.1 | 5.3 | 5.2 | 5.5 | 5.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Hefei, a weather station, about 198 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.