Nan climate — normals and trends
Nan (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.5 °C and it receives 1,424 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 (28.4 °C on average) and the coldest is January (21.5 °C). Rainfall peaks in August.
Nan averages 0 frost days, 244 hot days (≥ 30 °C) and 168 rainy days per year.
Nan has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.0 °C (on 28 April 1960) and the coldest 4.6 °C (on 25 December 1999).
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
NanNan
- coords
- 18.78°, 100.78°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.5°C
Average daily high
31.3°C
Average daily low
21.0°C
Annual rainfall
1,424mm
Sunshine / day
9.5h
Mean relative humidity
75%
Average peak wind
7.8km/h
Seasonal range
6.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
244 d/yr
Rainy days (≥ 1 mm)
168 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.3 °C
Average feels-like low
24.3 °C
Average peak gust
25.5 km/h
Tropical nights (≥ 20 °C)
248 d/yr
Solar radiation
17.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.78 · 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
42.0 °C
28 April 1960
Coldest day
4.6 °C
25 December 1999
Wettest day
215 mm
25 September 1943
Windiest day
23.8 km/h
28 March 1958
Strongest gust
70.2 km/h
6 July 1981
Hottest feels-like
47.5 °C
7 May 2023
Coldest feels-like
2.4 °C
25 December 1999
Sunniest day
12.9 h
8 July 2023
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 | 29.5 °C | +0.1 °C | 0 mm | -14 mm |
| Feb | 33.1 °C | +0.9 °C | 2 mm | -8 mm |
| Mar | 36.0 °C | +1.3 °C | 2 mm | -32 mm |
| Apr | 35.6 °C | +0.3 °C | 55 mm | -24 mm |
| May | 33.5 °C | +0.5 °C | 141 mm | -35 mm |
| Jun | 32.2 °C | +0.9 °C | 145 mm | -55 mm |
| Jul | 30.1 °C | -0.4 °C | 515 mm | +262 mm |
| Aug | 31.8 °C | +1.7 °C | 186 mm | -113 mm |
| Sep | 31.7 °C | +1.4 °C | 175 mm | -64 mm |
| Oct | 32.0 °C | +1.6 °C | 47 mm | -40 mm |
| Nov | 29.2 °C | -0.8 °C | 81 mm | +57 mm |
| Dec | 29.1 °C | +0.4 °C | 14 mm | +5 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 Nan?
Nan has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.5 °C and it receives 1,424 mm of precipitation per year.
What is the hottest day ever recorded in Nan?
The hottest day measured in Nan between 1940 and 2025 was 28 April 1960, reaching 42.0 °C.
What is the coldest day in Nan?
The coldest day measured in Nan between 1940 and 2025 was 25 December 1999, at 4.6 °C.
Does it snow in Nan?
Almost never: Nan sees virtually no snow, with about 0 frost days per year.
Has the climate of Nan warmed?
Yes: Nan warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nan?
The wettest day measured in Nan between 1940 and 2025 was 25 September 1943, with 215 mm of rain in 24 hours.
What was the windiest day in Nan?
The windiest day measured in Nan between 1940 and 2025 was 28 March 1958, with winds reaching 23.8 km/h.
What is the warmest month in Nan?
The warmest month in Nan is April (28.4 °C on average); the coldest is January (21.5 °C).
How much does it rain in Nan?
Nan receives on average 1,424 mm of precipitation per year, spread over about 168 rainy days.
Is it sunny in Nan?
Nan gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
Are there tropical nights in Nan?
Yes: Nan has on average 248 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nan?
In Nan, between 1940 and 2025, the highest apparent temperature reached 47.5 °C on 7 May 2023, and the lowest was 2.4 °C on 25 December 1999.
Compare Nan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nan