Long Diền climate — normals and trends
Long Diền (Vietnam) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.8 °C and it receives 1,771 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 (28.2 °C on average) and the coldest is January (25.4 °C). Rainfall peaks in September.
Long Diền averages 0 frost days, 173 hot days (≥ 30 °C) and 210 rainy days per year.
Long Diền has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The hottest day of the period reached 36.4 °C (on 19 April 2009) and the coldest 18.2 °C (on 12 January 1965).
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
Long DiềnHo Chi Minh City (HCMC)
- coords
- 10.48°, 107.22°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.8°C
Average daily high
29.9°C
Average daily low
24.7°C
Annual rainfall
1,771mm
Sunshine / day
10.5h
Mean relative humidity
82%
Average peak wind
16.5km/h
Seasonal range
2.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
173 d/yr
Rainy days (≥ 1 mm)
210 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.0 °C
Average feels-like low
28.6 °C
Average peak gust
34.8 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
19.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.79 · 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
36.4 °C
19 April 2009
Coldest day
18.2 °C
12 January 1965
Wettest day
122 mm
1 April 2012
Windiest day
40.5 km/h
7 November 1988
Strongest gust
79.6 km/h
6 November 1988
Hottest feels-like
42.8 °C
12 October 2017
Coldest feels-like
18.1 °C
28 January 1963
Sunniest day
12.3 h
2 June 1940
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 | 28.3 °C | -0.7 °C | 59 mm | +42 mm |
| Feb | 29.5 °C | -0.4 °C | 20 mm | +13 mm |
| Mar | 30.7 °C | 0.0 °C | 12 mm | -4 mm |
| Apr | 32.0 °C | +0.5 °C | 19 mm | -33 mm |
| May | 31.7 °C | +0.6 °C | 231 mm | +45 mm |
| Jun | 30.5 °C | +0.3 °C | 273 mm | +27 mm |
| Jul | 30.6 °C | +0.9 °C | 230 mm | -24 mm |
| Aug | 30.6 °C | +1.0 °C | 276 mm | +18 mm |
| Sep | 30.1 °C | +0.6 °C | 359 mm | +64 mm |
| Oct | 30.2 °C | +0.9 °C | 290 mm | +33 mm |
| Nov | 29.6 °C | +0.5 °C | 175 mm | +45 mm |
| Dec | 29.3 °C | +0.6 °C | 47 mm | -8 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 Long Diền?
Long Diền has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.8 °C and it receives 1,771 mm of precipitation per year.
What is the hottest day ever recorded in Long Diền?
The hottest day measured in Long Diền between 1940 and 2025 was 19 April 2009, reaching 36.4 °C.
What is the coldest day in Long Diền?
The coldest day measured in Long Diền between 1940 and 2025 was 12 January 1965, at 18.2 °C.
Does it snow in Long Diền?
Almost never: Long Diền sees virtually no snow, with about 0 frost days per year.
Has the climate of Long Diền warmed?
Yes: Long Diền warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Long Diền?
The wettest day measured in Long Diền between 1940 and 2025 was 1 April 2012, with 122 mm of rain in 24 hours.
What was the windiest day in Long Diền?
The windiest day measured in Long Diền between 1940 and 2025 was 7 November 1988, with winds reaching 40.5 km/h.
What is the warmest month in Long Diền?
The warmest month in Long Diền is April (28.2 °C on average); the coldest is January (25.4 °C).
How much does it rain in Long Diền?
Long Diền receives on average 1,771 mm of precipitation per year, spread over about 210 rainy days.
Is it sunny in Long Diền?
Long Diền gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
Are there tropical nights in Long Diền?
Yes: Long Diền has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Long Diền?
In Long Diền, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 12 October 2017, and the lowest was 18.1 °C on 28 January 1963.
Compare Long Diền with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Long Diền