Nanjing, China climate

Cfa Humid subtropical

Nanjing has a strongly seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 90°F, while the coldest is January averaging around 31°F at night. Precipitation totals about 45 inches a year and is strongly seasonal — July alone averages 9.2 inches while December barely receives 1.35 inches.

☀️ Summers

Hot

Highs near 90°F in July.

About 38 days a year above 90 °F

❄️ Winters

Cold

Lows near 31°F in January.

About 36 freezing nights a year

🌧️ Rain

Wet

About 45 in of rain a year.

Wettest in July

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.3 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Nanjing climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	45	50	59	70	80	85	90	89	82	73	62	50
Avg temp (°F)	38	43	50	61	71	78	84	82	75	65	53	42
Avg low (°F)	31	35	42	52	62	70	77	76	68	57	45	35
Precipitation (in)	2.0	2.1	3.3	3.1	3.4	7.2	9.2	6.3	2.5	2.4	1.9	1.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	45	50	59	70	80	85
Avg temp (°F)	38	43	50	61	71	78
Avg low (°F)	31	35	42	52	62	70
Precipitation (in)	2.0	2.1	3.3	3.1	3.4	7.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	90	89	82	73	62	50
Avg temp (°F)	84	82	75	65	53	42
Avg low (°F)	77	76	68	57	45	35
Precipitation (in)	9.2	6.3	2.5	2.4	1.9	1.4

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	11	9	10	11	11	12	8	7	8	7
Days with high ≥ 90°F (days)	—	—	—	0.3	2	6	14	12	2	0.2	—	—
Days with low ≤ 32°F (days)	15	9	2	0.0	—	—	—	—	—	—	1	10

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	9	11	9	10	11
Days with high ≥ 90°F (days)	—	—	—	0.3	2	6
Days with low ≤ 32°F (days)	15	9	2	0.0	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	12	8	7	8	7
Days with high ≥ 90°F (days)	14	12	2	0.2	—	—
Days with low ≤ 32°F (days)	—	—	—	—	1	10

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	67	69	69	71	76	71	66	63	58	55	54
Clear days (≤ 30% cloud)	8	5	5	5	4	3	4	5	7	9	10	11
Partly cloudy days (30–70%)	8	7	8	8	8	7	8	11	8	8	8	8
Cloudy days (≥ 70%)	15	16	18	17	19	21	19	16	15	14	12	12
Relative humidity (%)	76	75	75	72	70	74	81	80	76	72	74	75
Wind speed (mph)	5.8	6.2	6.6	6.4	6.2	5.7	5.4	5.5	5.6	5.4	5.7	5.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	67	69	69	71	76
Clear days (≤ 30% cloud)	8	5	5	5	4	3
Partly cloudy days (30–70%)	8	7	8	8	8	7
Cloudy days (≥ 70%)	15	16	18	17	19	21
Relative humidity (%)	76	75	75	72	70	74
Wind speed (mph)	5.8	6.2	6.6	6.4	6.2	5.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	71	66	63	58	55	54
Clear days (≤ 30% cloud)	4	5	7	9	10	11
Partly cloudy days (30–70%)	8	11	8	8	8	8
Cloudy days (≥ 70%)	19	16	15	14	12	12
Relative humidity (%)	81	80	76	72	74	75
Wind speed (mph)	5.4	5.5	5.6	5.4	5.7	5.7

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Nanjing, a weather station, about 18 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.

How we build these numbers →