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Roi Et, Thailand climate
Aw Tropical savanna (dry winter)
Roi Et has a mildly seasonal tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is April with an average daily high near 97°F, while the coldest is December averaging around 64°F at night. Precipitation totals about 55 inches a year and is strongly seasonal — August alone averages 11.1 inches while December barely receives 0.16 inches.
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)Roi Et climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 87 | 91 | 95 | 97 | 94 | 93 | 91 | 90 | 89 | 89 | 88 | 86 |
| Avg temp (°F) | 76 | 79 | 84 | 87 | 86 | 85 | 84 | 83 | 83 | 81 | 79 | 75 |
| Avg low (°F) | 64 | 67 | 73 | 76 | 77 | 78 | 77 | 77 | 76 | 73 | 69 | 64 |
| Precipitation (in) | 0.2 | 0.7 | 1.1 | 2.8 | 7.5 | 8.2 | 9.1 | 11.1 | 10.3 | 3.1 | 0.5 | 0.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 87 | 91 | 95 | 97 | 94 | 93 |
| Avg temp (°F) | 76 | 79 | 84 | 87 | 86 | 85 |
| Avg low (°F) | 64 | 67 | 73 | 76 | 77 | 78 |
| Precipitation (in) | 0.2 | 0.7 | 1.1 | 2.8 | 7.5 | 8.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 91 | 90 | 89 | 89 | 88 | 86 |
| Avg temp (°F) | 84 | 83 | 83 | 81 | 79 | 75 |
| Avg low (°F) | 77 | 77 | 76 | 73 | 69 | 64 |
| Precipitation (in) | 9.1 | 11.1 | 10.3 | 3.1 | 0.5 | 0.2 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 1 | 2 | 4 | 7 | 15 | 15 | 17 | 18 | 18 | 9 | 2 | 0.8 |
| Days with high ≥ 90°F (days) | 10 | 17 | 24 | 26 | 27 | 23 | 20 | 16 | 14 | 14 | 11 | 7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 1 | 2 | 4 | 7 | 15 | 15 |
| Days with high ≥ 90°F (days) | 10 | 17 | 24 | 26 | 27 | 23 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 18 | 18 | 9 | 2 | 0.8 |
| Days with high ≥ 90°F (days) | 20 | 16 | 14 | 14 | 11 | 7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 31 | 35 | 46 | 58 | 78 | 86 | 88 | 91 | 82 | 57 | 41 | 32 |
| Relative humidity (%) | 58 | 51 | 50 | 57 | 73 | 82 | 85 | 88 | 88 | 85 | 78 | 67 |
| Wind speed (mph) | 6.8 | 6.3 | 5.5 | 4.6 | 4.5 | 5.4 | 5.6 | 5.1 | 3.8 | 4.8 | 6.0 | 7.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 31 | 35 | 46 | 58 | 78 | 86 |
| Relative humidity (%) | 58 | 51 | 50 | 57 | 73 | 82 |
| Wind speed (mph) | 6.8 | 6.3 | 5.5 | 4.6 | 4.5 | 5.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 88 | 91 | 82 | 57 | 41 | 32 |
| Relative humidity (%) | 85 | 88 | 88 | 85 | 78 | 67 |
| Wind speed (mph) | 5.6 | 5.1 | 3.8 | 4.8 | 6.0 | 7.2 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Roi ET, a weather station, about 3 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.