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Dien Bien Phu, Vietnam climate
Cwa Monsoon-influenced humid subtropical
Dien Bien Phu has a mildly seasonal warm-temperate climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is June with an average daily high near 30°C, while the coldest is January averaging around 11°C at night. Precipitation totals about 1241 mm a year and is strongly seasonal — August alone averages 241 mm while February barely receives 19 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Dien Bien Phu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 24 | 27 | 29 | 31 | 30 | 30 | 30 | 29 | 28 | 25 | 22 |
| Avg temp (°C) | 16 | 18 | 22 | 24 | 26 | 26 | 26 | 26 | 25 | 23 | 20 | 17 |
| Avg low (°C) | 11 | 13 | 16 | 19 | 21 | 22 | 22 | 22 | 21 | 18 | 15 | 11 |
| Precipitation (mm) | 35 | 19 | 46 | 108 | 159 | 172 | 240 | 241 | 113 | 52 | 29 | 26 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 24 | 27 | 29 | 31 | 30 |
| Avg temp (°C) | 16 | 18 | 22 | 24 | 26 | 26 |
| Avg low (°C) | 11 | 13 | 16 | 19 | 21 | 22 |
| Precipitation (mm) | 35 | 19 | 46 | 108 | 159 | 172 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 29 | 28 | 25 | 22 |
| Avg temp (°C) | 26 | 26 | 25 | 23 | 20 | 17 |
| Avg low (°C) | 22 | 22 | 21 | 18 | 15 | 11 |
| Precipitation (mm) | 240 | 241 | 113 | 52 | 29 | 26 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 45 | 48 | 60 | 76 | 89 | 90 | 85 | 71 | 61 | 49 | 52 |
| Relative humidity (%) | 78 | 72 | 69 | 70 | 74 | 79 | 82 | 83 | 81 | 82 | 80 | 79 |
| Wind speed (mph) | 1.1 | 1.3 | 1.3 | 1.3 | 1.1 | 0.9 | 0.9 | 0.9 | 0.9 | 1.0 | 1.1 | 1.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 45 | 48 | 60 | 76 | 89 |
| Relative humidity (%) | 78 | 72 | 69 | 70 | 74 | 79 |
| Wind speed (mph) | 1.1 | 1.3 | 1.3 | 1.3 | 1.1 | 0.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 85 | 71 | 61 | 49 | 52 |
| Relative humidity (%) | 82 | 83 | 81 | 82 | 80 | 79 |
| Wind speed (mph) | 0.9 | 0.9 | 0.9 | 1.0 | 1.1 | 1.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Son LA, a weather station, about 91 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.