Under the Köppen climate classification, Cayenne has a tropical monsoon climate. Average high and low temperatures are nearly identical throughout the course of the year averaging about 30 °C (86 °F) and 23 °C (73 °F) respectively. Cayenne sees a copious amount of precipitation during the year. The city features a very lengthy wet season and a very short dry season. The dry season only covers two months of the year (September and October) while the wet season covers the remainder of the year. Precipitation is seen even during the dry season, a trait commonly seen in places featuring tropical monsoon climates. Cayenne averages roughly 3,750 millimetres (150 in) of rain each year.
Climate data for Cayenne Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Average high °C (°F) 29 (84) 29 (84) 29 (84) 30 (86) 29 (84) 31 (88) 31 (88) 32 (90) 32 (90) 32 (90) 31 (88) 30 (86) 30.4 (86.8) Daily mean °C (°F) 26 (79) 26 (79) 26 (79) 27 (81) 26 (79) 27 (81) 27 (81) 28 (82) 28 (82) 28 (82) 27 (81) 27 (81) 26.9 (80.6) Average low °C (°F) 23 (73) 23 (73) 23 (73) 24 (75) 23 (73) 23 (73) 23 (73) 23 (73) 23 (73) 23 (73) 23 (73) 23 (73) 23.1 (73.2) Rainfall mm (inches) 431 (16.97) 423 (16.65) 432 (17.01) 480 (18.9) 590 (23.23) 457 (17.99) 274 (10.79) 144 (5.67) 32 (1.26) 42 (1.65) 122 (4.8) 317 (12.48) 3,744 (147.4) Avg. rainy days (≥ 0.1 mm) 23 20 21 19 25 26 21 14 6 5 11 21 212 Mean monthly sunshine hours 142.6 116.0 136.4 129.0 136.4 171.0 207.7 232.5 261.0 266.6 234.0 192.2 2,225.4 Source: climatetemp.info
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