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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Chiang Rai station, 6 km from Chiang Rai. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 28.6°C / 13.8°C | 17 mm | 2 | 74% | 30 |
| February | 31.3°C / 14.5°C | 13 mm | 2 | 67% | 30 |
| March | 33.7°C / 17.5°C | 35 mm | 4 | 64% | 30 |
| April | 34.7°C / 21.1°C | 93 mm | 10 | 67% | 30 |
| May | 33.5°C / 23.0°C | 227 mm | 17 | 75% | 30 |
| June | 32.5°C / 24.0°C | 186 mm | 19 | 79% | 30 |
| July | 31.3°C / 23.9°C | 318 mm | 23 | 82% | 30 |
| August | 30.9°C / 23.7°C | 373 mm | 24 | 84% | 30 |
| September | 31.4°C / 23.1°C | 275 mm | 17 | 83% | 30 |
| October | 30.9°C / 21.5°C | 124 mm | 11 | 81% | 30 |
| November | 29.6°C / 17.9°C | 45 mm | 5 | 78% | 30 |
| December | 27.8°C / 14.7°C | 21 mm | 3 | 77% | 30 |
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