Nanjing climate
Nanjing (Jiangsu, China) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 16 °C61 °F, and about 1,196 mm47 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Nanjing climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 744 | −327 | 236 | 522.1 | 23 |
| Feb | 1050 | 031 | 541 | 642.5 | 14 |
| Mar | 1660 | 439 | 1050 | 702.8 | 5 |
| Apr | 2272 | 1050 | 1661 | 953.7 | 0 |
| May | 2781 | 1660 | 2271 | 873.4 | 0 |
| Jun | 3187 | 2069 | 2678 | 1817.1 | 0 |
| Jul | 3290 | 2576 | 2883 | 2439.6 | 0 |
| Aug | 3289 | 2475 | 2882 | 1556.1 | 0 |
| Sep | 2883 | 1966 | 2374 | 943.7 | 0 |
| Oct | 2374 | 1254 | 1864 | 552.1 | 0 |
| Nov | 1762 | 642 | 1152 | 592.3 | 2 |
| Dec | 948 | −130 | 439 | 421.7 | 18 |
| Year | 3290 | −327 | 1661 | 1,19647 | 62 |
“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% | 61% | 2.3 | 10:16 |
| Feb | 78% | 66% | 2.7 | 11:00 |
| Mar | 75% | 63% | 3.8 | 11:54 |
| Apr | 73% | 65% | 4.6 | 12:56 |
| May | 71% | 70% | 4.8 | 13:47 |
| Jun | 74% | 75% | 4.5 | 14:14 |
| Jul | 82% | 74% | 4.6 | 14:03 |
| Aug | 81% | 67% | 4.5 | 13:19 |
| Sep | 78% | 64% | 3.9 | 12:19 |
| Oct | 73% | 57% | 3.2 | 11:19 |
| Nov | 75% | 55% | 2.5 | 10:28 |
| Dec | 75% | 54% | 2.2 | 10:04 |
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 Nanjing is like
The warmest month is July, with an average high of 32 °C90 °F and a low of 25 °C76 °F. The coldest is January, when highs average 7 °C44 °F and lows −3 °C27 °F. Seasons are strongly marked: the warmest month is on average 26.2 °C47.1 °F warmer than the coldest.
It is wet, with about 1,196 mm47 in of precipitation per year. The wettest three-month stretch is June–August, which brings 48% of the annual total. The wettest month is July (243 mm9.6 in), the driest is December (42 mm1.7 in).
Relative humidity ranges from 71% in May to 82% in July. The clearest skies (lowest average cloud amount, 54%) are typical of December. Average wind speed near the ground ranges from 9 km/h (5 mph) in July to 10 km/h (6 mph) in March. Daylight lasts from about 10.1 hours in December to 14.2 hours in June.
Best time to visit Nanjing
Based on these averages, the most comfortable months for sightseeing and outdoor activities are April and May and October: average highs of 22 °C72 °F to 27 °C81 °F with 55 mm2.1 in to 95 mm3.7 in of precipitation per month.
The most challenging month is July, which is hot, with average highs of 32 °C90 °F, very wet (243 mm9.6 in) and humid (82% relative humidity).
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.
Nanjing weather by month
- January7 °C44 °F / −3 °C27 °F
- February10 °C50 °F / 0 °C31 °F
- March16 °C60 °F / 4 °C39 °F
- April22 °C72 °F / 10 °C50 °F
- May27 °C81 °F / 16 °C60 °F
- June31 °C87 °F / 20 °C69 °F
- July32 °C90 °F / 25 °C76 °F
- August32 °C89 °F / 24 °C75 °F
- September28 °C83 °F / 19 °C66 °F
- October23 °C74 °F / 12 °C54 °F
- November17 °C62 °F / 6 °C42 °F
- December9 °C48 °F / −1 °C30 °F
What to pack for Nanjing
- Winter (December–February) — highs 744 to 10 °C50 °F, lows −327 to 0 °C31 °F, about 53 mm2.1 in of precipitation a month. Pack a warm coat, layers and closed shoes and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1660 to 27 °C81 °F, lows 439 to 16 °C60 °F, about 84 mm3.3 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3187 to 32 °C90 °F, lows 2069 to 25 °C76 °F, about 193 mm7.6 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1762 to 28 °C83 °F, lows 642 to 19 °C66 °F, about 69 mm2.7 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Nanjing compares
Compared with Hefei, about 143 km to the west, Nanjing has practically the same average temperature and receives a similar amount of precipitation.
Of the 547 places in China covered by World Climates, Nanjing is the 253rd warmest by annual mean temperature and the 193rd 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: Tulsa (United States, Cfa), Oklahoma City (United States, Cfa) and Broken Arrow (United States, Cfa).
Nearby places
- Maanshan 49 km · 16 °C62 °F · 1,295 mm51 in
- Chuzhou 54 km · 16 °C60 °F · 1,112 mm44 in
- Zhenjiang 66 km · 16 °C61 °F · 1,179 mm46 in
- Yangzhou 72 km · 16 °C60 °F · 1,116 mm44 in
- Wuhu 85 km · 17 °C62 °F · 1,302 mm51 in
- Chaohu 100 km · 16 °C62 °F · 1,302 mm51 in
- Mingguang 111 km · 16 °C60 °F · 1,042 mm41 in
- Changzhou 116 km · 16 °C61 °F · 1,145 mm45 in
Frequently asked questions
What is the warmest month in Nanjing?
July is the warmest month in Nanjing, with an average high of 32 °C (90 °F) and an average low of 25 °C (76 °F).
What is the coldest month in Nanjing?
January is the coldest month, with an average high of 7 °C (44 °F) and an average low of -3 °C (27 °F).
When does it rain the most in Nanjing?
July is the wettest month with about 243 mm (9.6 in) of precipitation; December is the driest with about 42 mm (1.7 in).
What is the best time to visit Nanjing?
Judging by long-term averages, the most comfortable months are April and 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.