Cotonou
Benin
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 33 | 38 | 38 | 37 | 38 | 40 | 42 | 42 | 38 | 37 | 37 | 37 | 42 |
| Average high, °C | 28 | 31 | 33 | 32 | 32 | 35 | 35 | 35 | 32 | 30 | 28 | 28 | 32 |
| Average temperature, °C | 25 | 26 | 26 | 26 | 26 | 28 | 30 | 29 | 28 | 26 | 25 | 25 | 27 |
| Average low, °C | 21 | 21 | 19 | 19 | 20 | 22 | 23 | 24 | 23 | 22 | 21 | 21 | 21 |
| Record low, °C | 16 | 16 | 12 | 12 | 10 | 14 | 17 | 20 | 18 | 18 | 18 | 18 | 10 |
| Rain, days | 12 | 5 | 1 | 0 | 0 | 1 | 2 | 4 | 6 | 7 | 11 | 12 | 61 |
| Fog, days | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 5 | 6 | 20 |
| Thunderstorms, days | 16 | 15 | 3 | 0 | 0 | 1 | 4 | 11 | 14 | 13 | 13 | 14 | 104 |
| Average precipitation, mm. | 276 | 113 | 21 | 3 | 1 | 5 | 27 | 80 | 122 | 154 | 218 | 261 | 1281 |
| Relative humidity, % | 81 | 74 | 57 | 42 | 33 | 37 | 50 | 64 | 73 | 78 | 82 | 82 | 63 |
| Relative humidity morning, % | 96 | 93 | 68 | 39 | 31 | 32 | 55 | 77 | 88 | 93 | 95 | 96 | 72 |
| Relative humidity evening, % | 70 | 57 | 31 | 20 | 17 | 16 | 26 | 41 | 54 | 61 | 68 | 72 | 44 |
| Wind speed, km/h | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 8 | 9 | 9 | 9 | 8 |
| Day Length, часов | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 12 |
| Dew point, °C | 21 | 20 | 13 | 6 | 3 | 5 | 12 | 19 | 21 | 21 | 21 | 21 | 183 |
| Growing degree-day, °C | 450 | 499 | 492 | 499 | 508 | 534 | 611 | 592 | 560 | 492 | 465 | 465 | 6167 |
| Solar radiation, global, Mj/m2 | 18 | 20 | 21 | 20 | 20 | 22 | 22 | 22 | 21 | 19 | 17 | 16 | 20 |