Lang Suan climate — normals and trends
Lang Suan (Thailand) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 25.8 °C and it receives 2,149 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 April (27.3 °C on average) and the coldest is January (24.5 °C). Rainfall peaks in October.
Lang Suan averages 0 frost days, 184 hot days (≥ 30 °C) and 244 rainy days per year.
Lang Suan has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.9 °C (on 12 May 2023) and the coldest 14.1 °C (on 2 January 1957).
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
Lang SuanChumphon
- coords
- 9.95°, 99.08°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.8°C
Average daily high
30.0°C
Average daily low
22.7°C
Annual rainfall
2,149mm
Sunshine / day
9.9h
Mean relative humidity
85%
Average peak wind
14.3km/h
Seasonal range
2.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
184 d/yr
Rainy days (≥ 1 mm)
244 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.3 °C
Average feels-like low
26.7 °C
Average peak gust
36.9 km/h
Tropical nights (≥ 20 °C)
345 d/yr
Solar radiation
18.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.88 · 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
38.9 °C
12 May 2023
Coldest day
14.1 °C
2 January 1957
Wettest day
315 mm
28 March 2011
Windiest day
30.6 km/h
8 July 2014
Strongest gust
76.7 km/h
10 June 1965
Hottest feels-like
46.7 °C
19 April 2019
Coldest feels-like
14.4 °C
2 January 1957
Sunniest day
12.6 h
7 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 28.8 °C | +0.2 °C | 33 mm | -29 mm |
| Feb | 30.3 °C | +0.3 °C | 137 mm | +88 mm |
| Mar | 31.5 °C | +0.1 °C | 51 mm | -26 mm |
| Apr | 32.6 °C | +0.1 °C | 179 mm | +62 mm |
| May | 32.2 °C | +0.5 °C | 271 mm | +46 mm |
| Jun | 31.3 °C | +0.6 °C | 171 mm | -23 mm |
| Jul | 31.6 °C | +1.5 °C | 163 mm | -50 mm |
| Aug | 30.7 °C | +0.8 °C | 259 mm | +19 mm |
| Sep | 30.7 °C | +1.0 °C | 325 mm | +20 mm |
| Oct | 30.6 °C | +1.3 °C | 347 mm | +32 mm |
| Nov | 29.5 °C | +1.1 °C | 326 mm | +89 mm |
| Dec | 29.6 °C | +1.6 °C | 66 mm | -50 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 Lang Suan?
Lang Suan has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.8 °C and it receives 2,149 mm of precipitation per year.
What is the hottest day ever recorded in Lang Suan?
The hottest day measured in Lang Suan between 1940 and 2025 was 12 May 2023, reaching 38.9 °C.
What is the coldest day in Lang Suan?
The coldest day measured in Lang Suan between 1940 and 2025 was 2 January 1957, at 14.1 °C.
Does it snow in Lang Suan?
Almost never: Lang Suan sees virtually no snow, with about 0 frost days per year.
Has the climate of Lang Suan warmed?
Yes: Lang Suan warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lang Suan?
The wettest day measured in Lang Suan between 1940 and 2025 was 28 March 2011, with 315 mm of rain in 24 hours.
What was the windiest day in Lang Suan?
The windiest day measured in Lang Suan between 1940 and 2025 was 8 July 2014, with winds reaching 30.6 km/h.
What is the warmest month in Lang Suan?
The warmest month in Lang Suan is April (27.3 °C on average); the coldest is January (24.5 °C).
How much does it rain in Lang Suan?
Lang Suan receives on average 2,149 mm of precipitation per year, spread over about 244 rainy days.
Is it sunny in Lang Suan?
Lang Suan gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.
Are there tropical nights in Lang Suan?
Yes: Lang Suan has on average 345 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Lang Suan?
In Lang Suan, between 1940 and 2025, the highest apparent temperature reached 46.7 °C on 19 April 2019, and the lowest was 14.4 °C on 2 January 1957.
Compare Lang Suan with another city
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Nearby cities
The climate around Lang Suan