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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Udon Thani station, 4 km from Udon Thani. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 30.3°C / 16.7°C | 6 mm | 2 | 66% | 30 |
| February | 32.7°C / 18.6°C | 21 mm | 2 | 63% | 30 |
| March | 35.2°C / 22.0°C | 50 mm | 6 | 61% | 30 |
| April | 36.5°C / 24.4°C | 73 mm | 8 | 63% | 30 |
| May | 35.0°C / 25.0°C | 188 mm | 16 | 73% | 30 |
| June | 33.6°C / 25.1°C | 219 mm | 18 | 78% | 30 |
| July | 32.8°C / 25.0°C | 225 mm | 20 | 79% | 30 |
| August | 32.2°C / 24.6°C | 299 mm | 22 | 81% | 30 |
| September | 32.2°C / 24.3°C | 250 mm | 17 | 81% | 30 |
| October | 32.0°C / 22.9°C | 94 mm | 9 | 75% | 30 |
| November | 31.4°C / 20.0°C | 14 mm | 2 | 69% | 30 |
| December | 29.5°C / 16.7°C | 6 mm | 1 | 67% | 30 |
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