Haikou climate — normals and trends
Haikou (China) has a subtropical highland, dry winter climate (Cwb) under the Köppen-Geiger classification. Its mean annual temperature is 15.6 °C and it receives 1,278 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is June (20.0 °C on average) and the coldest is January (9.1 °C). Rainfall peaks in July.
Haikou averages 1 frost days, 2 hot days (≥ 30 °C) and 162 rainy days per year.
Haikou has warmed by +2.3 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The hottest day of the period reached 32.8 °C (on 25 May 1983) and the coldest -5.5 °C (on 27 December 1982).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HaikouYunnan
- coords
- 24.78°, 102.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.6°C
Average daily high
20.4°C
Average daily low
11.9°C
Annual rainfall
1,278mm
Sunshine / day
9.1h
Mean relative humidity
73%
Average peak wind
16.6km/h
Seasonal range
10.9°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
162 d/yr
Annual snowfall
3.9 cm
Average feels-like high
19.2 °C
Average feels-like low
10.9 °C
Average peak gust
38.8 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
16.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.73 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
32.8 °C
25 May 1983
Coldest day
-5.5 °C
27 December 1982
Wettest day
83 mm
28 July 1966
Windiest day
38.6 km/h
7 June 1946
Strongest gust
87.8 km/h
17 January 1984
Hottest feels-like
32.8 °C
27 July 2024
Coldest feels-like
-9.5 °C
24 January 2016
Snowiest day
23.8 cm
28 December 1983
Sunniest day
13.3 h
14 June 2013
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 14.3 °C | -0.5 °C | 21 mm | +0 mm |
| Feb | 17.8 °C | +0.6 °C | 13 mm | -10 mm |
| Mar | 20.7 °C | -0.2 °C | 15 mm | -15 mm |
| Apr | 24.6 °C | +1.0 °C | 46 mm | -3 mm |
| May | 23.7 °C | -0.6 °C | 222 mm | +105 mm |
| Jun | 23.9 °C | +0.2 °C | 239 mm | +8 mm |
| Jul | 25.1 °C | +1.7 °C | 364 mm | +107 mm |
| Aug | 24.2 °C | +0.7 °C | 270 mm | +23 mm |
| Sep | 23.6 °C | +1.3 °C | 230 mm | +71 mm |
| Oct | 21.2 °C | +1.4 °C | 133 mm | +39 mm |
| Nov | 16.4 °C | -0.7 °C | 128 mm | +93 mm |
| Dec | 15.9 °C | +1.4 °C | 5 mm | -12 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Haikou?
Haikou has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 1,278 mm of precipitation per year.
What is the hottest day ever recorded in Haikou?
The hottest day measured in Haikou between 1940 and 2025 was 25 May 1983, reaching 32.8 °C.
What is the coldest day in Haikou?
The coldest day measured in Haikou between 1940 and 2025 was 27 December 1982, at -5.5 °C.
Does it snow in Haikou?
Yes. Haikou gets on average 3.9 cm of snow per year and has around 1 frost days.
Has the climate of Haikou warmed?
Yes: Haikou warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Haikou?
The wettest day measured in Haikou between 1940 and 2025 was 28 July 1966, with 83 mm of rain in 24 hours.
What was the windiest day in Haikou?
The windiest day measured in Haikou between 1940 and 2025 was 7 June 1946, with winds reaching 38.6 km/h.
What is the warmest month in Haikou?
The warmest month in Haikou is June (20.0 °C on average); the coldest is January (9.1 °C).
How much does it rain in Haikou?
Haikou receives on average 1,278 mm of precipitation per year, spread over about 162 rainy days.
Is it sunny in Haikou?
Haikou gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Haikou?
The heaviest 24-hour snowfall measured in Haikou between 1940 and 2025 was 28 December 1983, with 23.8 cm.
Are there tropical nights in Haikou?
Yes: Haikou has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Haikou?
In Haikou, between 1940 and 2025, the highest apparent temperature reached 32.8 °C on 27 July 2024, and the lowest was -9.5 °C on 24 January 2016.
Compare Haikou with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Haikou