Climate averages 1991–2020
Changshu weather
in December.
A cool, moderately wet month: the 10th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Changshu: daytime highs average 10.7°C and nights cool to about 2.1°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 40 mm of rain on roughly 6 days, which makes December a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 10 h 08 min on an average December day.
The nearest other city in this atlas is Zhangjiagang (31 km away). In December its highs average 10.2°C, 0.6°C cooler than Changshu, with 38 mm of rain.
Among the 884 cities listed in China, Changshu ranks joint 348th of 884 for the warmest December highs and joint 668th of 884 for the driest December (rainfall, lowest first). The mean December high of those 884 cities is 7.5°C; Changshu is 3.2°C warmer than that mean.
From December to January, average highs fall by 2.4°C to 8.4°C, and monthly rainfall rises from 40 mm to 60 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Changshu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.4°C-0.1°C | -0.1°C | 60 | 8.2 | 10.310 h |
| February | 10.6°C1.5°C | 1.5°C | 58 | 8.4 | 11.011 h |
| March | 14.8°C5.2°C | 5.2°C | 83 | 10.7 | 12.012 h |
| April | 20.6°C10.4°C | 10.4°C | 96 | 9.7 | 12.913 h |
| May | 25.5°C16.0°C | 16.0°C | 118 | 9.9 | 13.714 h |
| June | 28.3°C20.4°C | 20.4°C | 245 | 13.1 | 14.214 h |
| July | 31.8°C24.9°C | 24.9°C | 193 | 14.7 | 14.014 h |
| August | 31.3°C24.8°C | 24.8°C | 172 | 14.9 | 13.313 h |
| September | 27.3°C20.2°C | 20.2°C | 92 | 9.6 | 12.412 h |
| October | 22.7°C14.3°C | 14.3°C | 51 | 6.1 | 11.411 h |
| November | 17.2°C8.5°C | 8.5°C | 54 | 7.1 | 10.611 h |
| December, selected | 10.7°C2.1°C | 2.1°C | 40 | 6.1 | 10.110 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Zhangjiagang in DecemberChina · 31 kmHigh 10.2°C · Low 2.2°C · 38 mm rain
- Kunshan in DecemberChina · 36 kmHigh 10.9°C · Low 2.8°C · 42 mm rain
- Taicang in DecemberChina · 40 kmHigh 10.9°C · Low 3.1°C · 42 mm rain
- Suzhou in DecemberChina · 41 kmHigh 10.3°C · Low 3.3°C · 55 mm rain
- Wuxi in DecemberChina · 44 kmHigh 10.3°C · Low 2.6°C · 48 mm rain
- Nantong in DecemberChina · 45 kmHigh 10.1°C · Low 2.5°C · 39 mm rain
- Songling in DecemberChina · 50 kmHigh 10.6°C · Low 3.1°C · 43 mm rain
- Jiangyin in DecemberChina · 54 kmHigh 10.2°C · Low 1.8°C · 38 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Changshu) is explained once on the Changshu year overview and on the Sources, method and limits page.