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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Nong Khai station. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 29.8°C / 17.3°C | 11 mm | 2 | 68% | 30 |
| February | 32.1°C / 19.1°C | 18 mm | 2 | 65% | 30 |
| March | 34.7°C / 22.2°C | 44 mm | 5 | 64% | 30 |
| April | 36.3°C / 24.5°C | 84 mm | 8 | 67% | 30 |
| May | 34.7°C / 24.9°C | 232 mm | 17 | 76% | 30 |
| June | 33.4°C / 25.1°C | 253 mm | 19 | 81% | 30 |
| July | 32.6°C / 24.9°C | 322 mm | 21 | 83% | 30 |
| August | 32.1°C / 24.6°C | 347 mm | 23 | 85% | 30 |
| September | 32.2°C / 24.4°C | 269 mm | 18 | 83% | 30 |
| October | 32.2°C / 23.2°C | 88 mm | 8 | 76% | 30 |
| November | 31.3°C / 20.4°C | 16 mm | 2 | 70% | 30 |
| December | 29.4°C / 17.5°C | 8 mm | 1 | 68% | 30 |
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