Changshu, China Climate
The warmest month is July, with an average high of 32°C; the coldest is January, with an average low of -1°C. A normal year brings 1109 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 25
- Normal high
- 27°C
- Normal low
- 18°C
- Reanalysis high
- 31°Cin 1996
- Reanalysis low
- 15°Cin 1999
- Chance of a wet day
- 32%
- Daylight
- 12 h 03 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 8°C | -1°C | 21°C (2002) | -12°C (2016) | 56 mm | 9.3 |
| February | 11°C | 1°C | 25°C (2009) | -10°C (2010) | 59 mm | 8.5 |
| March | 15°C | 4°C | 27°C (2015) | -6°C (2010) | 84 mm | 9.3 |
| April | 22°C | 10°C | 33°C (2004) | -2°C (1991) | 81 mm | 9.0 |
| May | 27°C | 16°C | 38°C (2011) | 6°C (1991) | 87 mm | 9.3 |
| June | 30°C | 20°C | 38°C (2005) | 13°C (2004) | 183 mm | 15.0 |
| July | 32°C | 25°C | 41°C (1992) | 18°C (2015) | 167 mm | 15.5 |
| August | 32°C | 25°C | 40°C (2013) | 17°C (2016) | 146 mm | 15.5 |
| September | 29°C | 20°C | 41°C (1995) | 11°C (2012) | 96 mm | 9.0 |
| October | 24°C | 14°C | 33°C (1994) | 2°C (1993) | 59 mm | 6.2 |
| November | 18°C | 8°C | 29°C (2003) | -6°C (1993) | 54 mm | 9.0 |
| December | 11°C | 1°C | 22°C (2004) | -10°C (1991) | 37 mm | 6.2 |
| Year | 22°C | 12°C | 1109 mm | 122 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1109 mm in a normal year, most in June.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Changshu.
The muggiest month is July, when 99 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -1°C | 78% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | 1°C | 78% | 99% | 1% | 0% | 0% | 0% | 0% |
| March | 5°C | 77% | 95% | 4% | 0% | 0% | 0% | 0% |
| April | 10°C | 75% | 68% | 19% | 10% | 2% | 0% | 0% |
| May | 15°C | 73% | 24% | 28% | 26% | 18% | 3% | 0% |
| June | 20°C | 77% | 1% | 7% | 21% | 35% | 23% | 13% |
| July | 24°C | 81% | 0% | 0% | 1% | 6% | 24% | 69% |
| August | 24°C | 80% | 0% | 0% | 1% | 9% | 30% | 60% |
| September | 19°C | 78% | 4% | 10% | 23% | 30% | 24% | 10% |
| October | 13°C | 76% | 41% | 31% | 18% | 8% | 2% | 0% |
| November | 8°C | 77% | 84% | 11% | 5% | 1% | 0% | 0% |
| December | 1°C | 76% | 99% | 1% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is December, with the sky 54 percent covered on average; the cloudiest is June, at 79 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is March, averaging 15.5 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 15, with 14 h 13 min of daylight; the shortest is Dec 18, with 10 h 05 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Changshu in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.