List of largest cities in French Guiana
Cayenne
Guyane
Matoury
Guyane
Saint-Laurent-du-Maroni
Guyane
Kourou
Guyane
Remire-Montjoly
Guyane
Macouria
Guyane
Weather, climate, temperature by months in French Guiana
| Season | Autumn | Winter | Spring | Summer | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year | ||
| Record high | °C | 41 | 38 | 38 | 33 | 35 | 32 | 34 | 32 | 38 | 36 | 39 | 39 | 41 | |
| Average high | °C | 31 | 31 | 30 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | |
| Average temperature | °C | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | |
| Average low | °C | 22 | 23 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 23 | 23 | |
| Record low | °C | 19 | 19 | 19 | 20 | 20 | 18 | 17 | 20 | 20 | 21 | 18 | 20 | 17 | |
| Fog | Days | 6 | 7 | 7 | 4 | 1 | 1 | 1 | 1 | 3 | 7 | 7 | 6 | 51 | |
| Thunderstorms | Days | 5 | 4 | 3 | 1 | 1 | 0 | 0 | 1 | 2 | 3 | 5 | 6 | 30 | |
| Average precipitation | Mm. | 65 | 72 | 132 | 284 | 343 | 255 | 309 | 339 | 486 | 386 | 221 | 130 | 3022 | |
| Relative humidity morning | % | 98 | 98 | 98 | 97 | 95 | 93 | 94 | 95 | 97 | 98 | 98 | 97 | 97 | |
| Relative humidity evening | % | 65 | 66 | 69 | 76 | 76 | 74 | 74 | 75 | 78 | 78 | 73 | 69 | 73 | |
| Wind speed | Km/h | 12 | 12 | 12 | 12 | 13 | 14 | 14 | 13 | 10 | 10 | 10 | 12 | 12 | |
| Day Length | Hours | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 12 | |
| Dew point | °C | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 272 | |
| Growing degree-day | °C | 506 | 521 | 491 | 492 | 483 | 446 | 496 | 485 | 500 | 476 | 494 | 510 | 5898 | |
| Solar radiation, global | Mj/m2 | 24 | 23 | 21 | 19 | 18 | 20 | 21 | 20 | 18 | 18 | 21 | 23 | 21 | |
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