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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Nan station. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 30.8°C / 14.9°C | 14 mm | 2 | 76% | 30 |
| February | 33.6°C / 16.1°C | 9 mm | 1 | 69% | 30 |
| March | 36.3°C / 19.4°C | 39 mm | 4 | 65% | 30 |
| April | 37.0°C / 22.6°C | 98 mm | 8 | 68% | 30 |
| May | 35.5°C / 24.0°C | 170 mm | 14 | 75% | 30 |
| June | 34.0°C / 24.4°C | 135 mm | 15 | 78% | 30 |
| July | 32.7°C / 24.2°C | 213 mm | 19 | 82% | 30 |
| August | 32.2°C / 23.9°C | 292 mm | 22 | 84% | 30 |
| September | 32.9°C / 23.7°C | 206 mm | 17 | 84% | 30 |
| October | 32.8°C / 22.3°C | 60 mm | 9 | 81% | 30 |
| November | 31.8°C / 19.1°C | 16 mm | 2 | 79% | 30 |
| December | 30.1°C / 15.5°C | 12 mm | 1 | 77% | 30 |
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