Located within 30 arc minutes south of the Tropic of Cancer, Mengzi, as with much of southern Yunnan, has a warm humid subtropical climate (Koppen Cwa), with muddled distinction between the seasons and daytime temperatures remaining warm year-round. Highs peak in May before the core of the rainy season and reach a minimum in December; however, the warmest and coolest months are June and December, respectively at 23.2 °C (73.8 °F) and 12.3 °C (54.1 °F); the annual mean is 18.65 °C (65.6 °F). June thru September accounts for over 60% of the annual rainfall of 859 mm (33.8 in) and during this time, some rainfall occurs on a majority of days, resulting in a marked reduction in sunshine. With monthly percent possible sunshine ranging from 34% in June and July to 64% in February, the city receives 2,161 hours of bright sunshine annually.
Climate data for Mengzi (1971−2000) | |||||||||||||
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Average high, °C (°F) | 18.9 | 21.2 | 25.3 | 27.9 | 28.4 | 28.1 | 27.5 | 27.4 | 26.4 | 24.1 | 21.1 | 18.6 | 24.6 |
Average low, °C (°F) | 7.8 | 9.6 | 12.8 | 16.2 | 18.5 | 19.9 | 19.6 | 18.8 | 17.5 | 15.2 | 11.4 | 7.8 | 14.6 |
Average precipitation, mm (inches) | 14.8 | 19.2 | 26.9 | 46.2 | 96.9 | 109.8 | 175.0 | 160.2 | 100.1 | 51.2 | 45.9 | 12.8 | 859.0 |
Average precipitation (≥ 0.1 mm) days | 4.9 | 5.0 | 6.1 | 10.2 | 14.6 | 16.5 | 20.2 | 20.6 | 16.1 | 11.4 | 7.0 | 3.8 | 136.4 |
Average relative humidity, % | 70 | 65 | 60 | 62 | 69 | 75 | 79 | 81 | 78 | 76 | 75 | 72 | 71.8 |
Mean monthly sunshine hours | 208.9 | 204.9 | 230.6 | 226.3 | 200.2 | 138.4 | 140.0 | 148.9 | 149.0 | 153.4 | 166.0 | 194.8 | 2,161.4 |
Possible sunshine, % | 62 | 64 | 62 | 60 | 49 | 34 | 34 | 37 | 41 | 43 | 50 | 59 | 49 |
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