Franceville
Gabon
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 35 | 35 | 38 | 35 | 35 | 37 | 36 | 36 | 34 | 33 | 32 | 32 | 38 |
| Average high, °C | 30 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 31 | 28 | 28 | 28 | 30 |
| Average temperature, °C | 25 | 26 | 26 | 26 | 28 | 27 | 27 | 27 | 26 | 24 | 23 | 24 | 26 |
| Average low, °C | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 19 | 20 | 21 |
| Record low, °C | 15 | 18 | 19 | 20 | 17 | 20 | 19 | 20 | 20 | 16 | 13 | 12 | 12 |
| Rain, days | 3 | 17 | 17 | 0 | 0 | 0 | 10 | 10 | 9 | 1 | 0 | 0 | 67 |
| Fog, days | 1 | 1 | 3 | 6 | 8 | 7 | 8 | 9 | 12 | 12 | 10 | 3 | 80 |
| Thunderstorms, days | 0 | 8 | 15 | 10 | 9 | 13 | 15 | 15 | 9 | 0 | 0 | 0 | 94 |
| Average precipitation, mm. | 47 | 294 | 363 | 219 | 203 | 207 | 236 | 219 | 154 | 16 | 4 | 6 | 1968 |
| Relative humidity, % | 79 | 80 | 81 | 82 | 82 | 80 | 80 | 82 | 82 | 83 | 81 | 81 | 81 |
| Relative humidity morning, % | 92 | 93 | 97 | 98 | 98 | 98 | 98 | 99 | 99 | 98 | 96 | 93 | 97 |
| Relative humidity evening, % | 70 | 71 | 76 | 73 | 71 | 70 | 70 | 70 | 72 | 71 | 69 | 70 | 71 |
| Wind speed, km/h | 3 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Day Length, часов | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 |
| Dew point, °C | 21 | 22 | 23 | 23 | 24 | 23 | 23 | 24 | 23 | 21 | 20 | 20 | 267 |
| Growing degree-day, °C | 450 | 499 | 483 | 496 | 552 | 472 | 521 | 510 | 505 | 429 | 409 | 419 | 5745 |
| Solar radiation, global, Mj/m2 | 13 | 14 | 14 | 15 | 17 | 18 | 18 | 17 | 15 | 14 | 14 | 13 | 15 |