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Lạng Sơn, Vietnam climate
Cfa Humid subtropical
Lạng Sơn has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 32°C, while the coldest is January averaging around 10°C at night. Precipitation totals about 1190 mm a year and is strongly seasonal — August alone averages 223 mm while February barely receives 24 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)Lạng Sơn climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 19 | 22 | 27 | 30 | 32 | 32 | 31 | 30 | 28 | 24 | 20 |
| Avg temp (°C) | 14 | 16 | 19 | 23 | 26 | 28 | 28 | 28 | 26 | 23 | 19 | 15 |
| Avg low (°C) | 10 | 12 | 15 | 19 | 22 | 24 | 24 | 24 | 22 | 19 | 15 | 11 |
| Precipitation (mm) | 43 | 24 | 62 | 84 | 113 | 174 | 197 | 223 | 136 | 66 | 40 | 27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 19 | 22 | 27 | 30 | 32 |
| Avg temp (°C) | 14 | 16 | 19 | 23 | 26 | 28 |
| Avg low (°C) | 10 | 12 | 15 | 19 | 22 | 24 |
| Precipitation (mm) | 43 | 24 | 62 | 84 | 113 | 174 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 31 | 30 | 28 | 24 | 20 |
| Avg temp (°C) | 28 | 28 | 26 | 23 | 19 | 15 |
| Avg low (°C) | 24 | 24 | 22 | 19 | 15 | 11 |
| Precipitation (mm) | 197 | 223 | 136 | 66 | 40 | 27 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 76 | 80 | 80 | 79 | 85 | 83 | 80 | 70 | 59 | 60 | 63 |
| Relative humidity (%) | 77 | 76 | 76 | 75 | 78 | 85 | 87 | 87 | 84 | 81 | 78 | 75 |
| Wind speed (mph) | 5.8 | 6.2 | 6.5 | 6.4 | 5.5 | 4.8 | 4.6 | 3.8 | 4.3 | 4.8 | 4.9 | 5.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 76 | 80 | 80 | 79 | 85 |
| Relative humidity (%) | 77 | 76 | 76 | 75 | 78 | 85 |
| Wind speed (mph) | 5.8 | 6.2 | 6.5 | 6.4 | 5.5 | 4.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 80 | 70 | 59 | 60 | 63 |
| Relative humidity (%) | 87 | 87 | 84 | 81 | 78 | 75 |
| Wind speed (mph) | 4.6 | 3.8 | 4.3 | 4.8 | 4.9 | 5.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Lang Son, a weather station, about 2 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.