Cayenne
French Guiana
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 42 | 40 | 37 | 36 | 41 | 35 | 38 | 33 | 33 | 33 | 37 | 40 | 42 |
| Average high, °C | 30 | 30 | 29 | 28 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 30 | 28 |
| Average temperature, °C | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 26 |
| Average low, °C | 24 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 23 | 23 | 24 | 24 |
| Record low, °C | 21 | 20 | 21 | 20 | 19 | 18 | 20 | 20 | 20 | 21 | 21 | 21 | 18 |
| Fog, days | 1 | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 12 |
| Thunderstorms, days | 8 | 5 | 4 | 1 | 0 | 0 | 0 | 1 | 2 | 4 | 6 | 7 | 38 |
| Average precipitation, mm. | 110 | 100 | 160 | 240 | 260 | 180 | 190 | 240 | 340 | 330 | 240 | 170 | 2560 |
| Relative humidity morning, % | 98 | 98 | 98 | 98 | 97 | 97 | 96 | 97 | 98 | 98 | 98 | 98 | 98 |
| Relative humidity evening, % | 65 | 68 | 72 | 77 | 73 | 73 | 71 | 74 | 79 | 81 | 74 | 69 | 73 |
| Wind speed, km/h | 6 | 6 | 6 | 8 | 9 | 9 | 9 | 9 | 6 | 6 | 6 | 6 | 7 |
| Day Length, часов | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 12 |
| Dew point, °C | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 273 |
| Growing degree-day, °C | 525 | 543 | 500 | 499 | 491 | 447 | 508 | 492 | 508 | 483 | 508 | 534 | 6038 |
| Solar radiation, global, Mj/m2 | 25 | 24 | 21 | 19 | 20 | 22 | 23 | 22 | 19 | 19 | 22 | 23 | 22 |