Cotonou
Benin
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 37 | 35 | 38 | 37 | 37 | 39 | 40 | 38 | 38 | 35 | 33 | 33 | 40 |
| Average high, °C | 29 | 31 | 32 | 33 | 33 | 34 | 34 | 33 | 32 | 30 | 29 | 29 | 32 |
| Average temperature, °C | 26 | 27 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 26 | 26 | 25 | 27 |
| Average low, °C | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 23 | 23 | 22 | 23 |
| Record low, °C | 17 | 18 | 18 | 16 | 17 | 19 | 17 | 21 | 20 | 20 | 19 | 20 | 16 |
| Rain, days | 10 | 8 | 2 | 1 | 1 | 2 | 4 | 7 | 8 | 10 | 11 | 11 | 75 |
| Fog, days | 0 | 1 | 4 | 7 | 5 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 23 |
| Thunderstorms, days | 8 | 12 | 6 | 2 | 1 | 4 | 10 | 13 | 14 | 12 | 6 | 5 | 93 |
| Average precipitation, mm. | 118 | 135 | 41 | 12 | 9 | 36 | 85 | 121 | 160 | 205 | 100 | 66 | 1088 |
| Relative humidity, % | 82 | 81 | 77 | 74 | 72 | 72 | 74 | 77 | 80 | 83 | 83 | 83 | 78 |
| Relative humidity morning, % | 95 | 95 | 94 | 88 | 84 | 90 | 92 | 93 | 95 | 95 | 95 | 94 | 93 |
| Relative humidity evening, % | 68 | 65 | 53 | 45 | 39 | 40 | 49 | 57 | 66 | 70 | 72 | 71 | 58 |
| Wind speed, km/h | 10 | 9 | 8 | 7 | 9 | 12 | 12 | 11 | 9 | 10 | 13 | 13 | 10 |
| Day Length, часов | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 12 |
| Dew point, °C | 23 | 23 | 23 | 23 | 22 | 24 | 24 | 24 | 24 | 23 | 23 | 22 | 277 |
| Growing degree-day, °C | 477 | 521 | 531 | 549 | 549 | 537 | 592 | 555 | 546 | 492 | 481 | 477 | 6306 |
| Solar radiation, global, Mj/m2 | 16 | 18 | 19 | 19 | 20 | 21 | 21 | 20 | 19 | 17 | 15 | 15 | 18 |