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Climate table for Chiang Mai - northern Thailand. Information provided by Thailand Meterological Department.
| Month | Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
All |
| Mean temperature (oC) | |||||||||||||
| Daily | 20.9 | 23.3 | 26.7 | 28.8 | 28.1 | 27.6 | 27.1 | 26.7 | 26.6 | 25.9 | 23.8 | 21.1 | 25.6 |
| Morning Mininum | 14.1 | 15.5 | 19.0 | 22.3 | 23.6 | 23.9 | 23.7 | 23.5 | 23.1 | 22.0 | 19.1 | 15.2 | 20.4 |
| Extreme Min | 3.7 | 7.3 | 12.2 | 15.8 | 19.2 | 20.0 | 20.5 | 20.7 | 16.8 | 13.3 | 6.0 | 3.8 | 3.7 |
| Afternoon Maximun | 29.3 | 32.2 | 34.9 | 36.0 | 34.1 | 32.6 | 31.8 | 31.3 | 31.5 | 31.2 | 29.8 | 28.3 | 31.9 |
| Extreme Max | 34.1 | 37.7 | 39.2 | 41.4 | 40.1 | 39.3 | 37.5 | 36.5 | 36.1 | 37.9 | 34.5 | 33.4 | 41.4 |
| Mean relative humidity(%) | |||||||||||||
| at 0700 am. | 89 | 82 | 74 | 77 | 84 | 87 | 88 | 90 | 92 | 91 | 92 | 91 | 86 |
| at 0100 pm. |
45 | 37 | 35 | 42 | 54 | 61 | 63 | 66 | 65 | 60 | 54 | 49 | 53 |
| Surface wind |
|||||||||||||
| Mean Speed (km./hr.) |
2.4 | 3.7 | 4.8 | 6.1 | 6.1 | 5.7 | 5.0 | 4.6 | 4.3 | 4.1 | 3.3 | 3.0 | 4.4 |
| Direction |
south |
south | south | south | south | south, southwest | south, southwest | south | south | north | north | north | south |
| Mean rainfall |
|||||||||||||
| Amount (mm./month) |
7.7 | 9.2 | 17.3 | 54.4 | 155.4 | 119.4 | 157.6 | 224.4 | 202.4 | 116.6 | 51.4 | 18.1 | 1134 |
| Rainy Day (day/month) |
0.7 | 1.0 | 2.0 | 6.4 | 14.7 | 16.1 | 18.6 | 21.0 | 17.2 | 11.5 | 5.2 | 1.7 | 116.1 |
| Heavy Rainy Day (day/month) Greater Than 35 mm./day |
0.0 | 0.1 | 0.2 | 0.4 | 0.9 | 0.5 | 0.7 | 1.2 | 1.2 | 0.8 | 0.4 | 0.2 | 6.4 |
| Visibility (km.) |
|||||||||||||
| Time 07.00 |
5.9 | 6.2 | 5.3 | 7.5 | 11.0 | 12.1 | 11.9 | 11.7 | 10.5 | 8.7 | 7.5 | 6.2 | 8.7 |
| Daily |
8.2 | 8.0 | 7.2 | 8.9 | 11.5 | 12.2 | 12.0 | 11.8 | 11.3 | 10.5 | 9.9 | 9.1 | 10.1 |
| Mean sunshine duration |
|||||||||||||
| Daily |
8.8 | 9.4 | 8.7 | 8.5 | 8.2 | 5.7 | 4.6 | 4.1 | 5.5 | 6.8 | 6.8 | 7.9 | 7.1 |
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