Chongming climate
Chongming (China) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 17 °C62 °F, and about 1,256 mm49 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Chongming climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 745 | 439 | 542 | 652.6 | 2 |
| Feb | 846 | 440 | 643 | 752.9 | 1 |
| Mar | 1253 | 745 | 949 | 813.2 | 0 |
| Apr | 1662 | 1253 | 1457 | 923.6 | 0 |
| May | 2170 | 1763 | 1967 | 983.8 | 0 |
| Jun | 2576 | 2170 | 2373 | 1967.7 | 0 |
| Jul | 2984 | 2678 | 2781 | 1546.1 | 0 |
| Aug | 2984 | 2680 | 2882 | 1616.3 | 0 |
| Sep | 2679 | 2374 | 2576 | 1305.1 | 0 |
| Oct | 2271 | 1865 | 2068 | 742.9 | 0 |
| Nov | 1762 | 1355 | 1559 | 722.8 | 0 |
| Dec | 1050 | 744 | 847 | 582.3 | 1 |
| Year | 2984 | 439 | 1762 | 1,25649 | 4 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 65% | 2.3 | 10:18 |
| Feb | 80% | 67% | 2.7 | 11:01 |
| Mar | 80% | 64% | 3.8 | 11:54 |
| Apr | 81% | 65% | 4.5 | 12:55 |
| May | 82% | 70% | 4.8 | 13:45 |
| Jun | 87% | 79% | 4.2 | 14:12 |
| Jul | 87% | 70% | 5.1 | 14:01 |
| Aug | 85% | 61% | 5.0 | 13:18 |
| Sep | 80% | 63% | 4.1 | 12:19 |
| Oct | 75% | 58% | 3.5 | 11:20 |
| Nov | 76% | 57% | 2.6 | 10:30 |
| Dec | 75% | 55% | 2.2 | 10:06 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Chongming is like
The warmest month is August, with an average high of 29 °C84 °F and a low of 26 °C80 °F. The coldest is January, when highs average 7 °C45 °F and lows 4 °C39 °F. Seasons are strongly marked: the warmest month is on average 22.3 °C40.2 °F warmer than the coldest.
It is wet, with about 1,256 mm49 in of precipitation per year. The wettest three-month stretch is June–August, which brings 41% of the annual total. The wettest month is June (196 mm7.7 in), the driest is December (58 mm2.3 in).
Relative humidity ranges from 75% in October to 87% in July. The clearest skies (lowest average cloud amount, 55%) are typical of December. Average wind speed near the ground ranges from 15 km/h (10 mph) in June to 18 km/h (11 mph) in December. Daylight lasts from about 10.1 hours in December to 14.2 hours in June.
Best time to visit Chongming
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and October: average highs of 21 °C70 °F to 22 °C71 °F with 74 mm2.9 in to 98 mm3.8 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 7 °C45 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Chongming
- Winter (December–February) — highs 745 to 10 °C50 °F, lows 439 to 7 °C44 °F, about 66 mm2.6 in of precipitation a month. Pack a warm coat, layers and closed shoes.
- Spring (March–May) — highs 1253 to 21 °C70 °F, lows 745 to 17 °C63 °F, about 90 mm3.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Summer (June–August) — highs 2576 to 29 °C84 °F, lows 2170 to 26 °C80 °F, about 170 mm6.7 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1762 to 26 °C79 °F, lows 1355 to 23 °C74 °F, about 92 mm3.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Chongming compares
Compared with Baoshan, about 30 km to the southwest, Chongming has practically the same average temperature and receives a similar amount of precipitation. The difference is largest in December (1.7 °C3.1 °F warmer).
Of the 547 places in China covered by World Climates, Chongming is the 219th warmest by annual mean temperature and the 169th wettest by annual precipitation. See all of them on the China climate page.
Places in other countries with the most similar temperature and rainfall pattern: Okayama (Japan, Cfa), Takamatsu (Japan, Cfa) and Niihama (Japan, Cfa).
Nearby places
- Baoshan 30 km · 17 °C62 °F · 1,242 mm49 in
- Shanghai 50 km · 17 °C62 °F · 1,286 mm51 in
- Kunshan 75 km · 17 °C62 °F · 1,242 mm49 in
- Fengxiang 87 km · 17 °C62 °F · 1,286 mm51 in
- Nantong 90 km · 16 °C61 °F · 1,146 mm45 in
- Suzhou 110 km · 16 °C61 °F · 1,208 mm48 in
- Zhangjiagang 113 km · 16 °C61 °F · 1,146 mm45 in
- Jiaxing 132 km · 17 °C62 °F · 1,316 mm52 in
Frequently asked questions
What is the warmest month in Chongming?
August is the warmest month in Chongming, with an average high of 29 °C (84 °F) and an average low of 26 °C (80 °F).
What is the coldest month in Chongming?
January is the coldest month, with an average high of 7 °C (45 °F) and an average low of 4 °C (39 °F).
When does it rain the most in Chongming?
June is the wettest month with about 196 mm (7.7 in) of precipitation; December is the driest with about 58 mm (2.3 in).
What is the best time to visit Chongming?
Judging by long-term averages, the most comfortable months are May and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.