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==Climate== Under the [[Köppen climate classification]], Cayenne has a [[tropical monsoon climate]] (''Am'') bordering on an [[equatorial climate]] (''Af''). Average high and low temperatures are nearly identical throughout the course of the year, averaging about {{convert|30|C|F}} and {{convert|23|C|F|0}} respectively, although temperatures are somewhat cooler in the wet season than in the dry season. Cayenne sees copious precipitation during the year, with its weather being more strongly affected by the [[Intertropical Convergence Zone]] (ITCZ) than the [[trade winds]]. The city experiences a very lengthy [[wet season]] and a very short [[dry season]] – the dry season covers only August to October, while the wet season covers the remainder of the year. Some precipitation is seen even during the dry season, a trait common in tropical climates. Cayenne averages roughly {{convert|3500|mm|in|-1}} of rain each year. {{Clear}} {{Meteo France |Town=Cayenne |Sunshine= 2,072 |Rain=3,515.6 |Snow=0 |Storm=39.7 |Fog=34.1<ref>{{cite web|url=https://www.lameteo.org/index.php/12-climatologie/1670-normales-climatiques-1981-2010-cayenne|title=Normales climatiques 1981-2010 : Cayenne|website=www.lameteo.org|access-date=28 August 2022}}</ref> }} <br> {{Weather box |location = Cayenne <small>([[Cayenne – Félix Eboué Airport|CAY]], altitude 4m, 1991–2020 normals, extremes 1948–present)</small> |metric first = Y |single line = Y |Jan record high C = 32.5 |Feb record high C = 32.3 |Mar record high C = 32.2 |Apr record high C = 33.0 |May record high C = 33.8 |Jun record high C = 34.4 |Jul record high C = 34.5 |Aug record high C = 35.0 |Sep record high C = 35.2 |Oct record high C = 35.4 |Nov record high C = 34.6 |Dec record high C = 34.1 |Jan high C = 29.3 |Feb high C = 29.3 |Mar high C = 29.7 |Apr high C = 30.0 |May high C = 30.1 |Jun high C = 30.5 |Jul high C = 31.1 |Aug high C = 31.8 |Sep high C = 32.4 |Oct high C = 32.5 |Nov high C = 31.7 |Dec high C = 30.3 |year high C = 30.7 |Jan mean C = 26.4 |Feb mean C = 26.4 |Mar mean C = 26.7 |Apr mean C = 26.9 |May mean C = 26.8 |Jun mean C = 26.8 |Jul mean C = 26.8 |Aug mean C = 27.2 |Sep mean C = 27.4 |Oct mean C = 27.5 |Nov mean C = 27.2 |Dec mean C = 26.7 |year mean C = 26.9 |Jan low C = 23.4 |Feb low C = 23.5 |Mar low C = 23.6 |Apr low C = 23.8 |May low C = 23.6 |Jun low C = 23.0 |Jul low C = 22.5 |Aug low C = 22.5 |Sep low C = 22.5 |Oct low C = 22.4 |Nov low C = 22.7 |Dec low C = 23.2 |year low C = 23.1 |Jan record low C = 17.4 |Feb record low C = 18.9 |Mar record low C = 18.5 |Apr record low C = 19.0 |May record low C = 18.8 |Jun record low C = 18.9 |Jul record low C = 19.0 |Aug record low C = 19.0 |Sep record low C = 18.7 |Oct record low C = 18.6 |Nov record low C = 17.2 |Dec record low C = 18.8 |precipitation colour = green |Jan precipitation mm = 399.4 |Feb precipitation mm = 334.8 |Mar precipitation mm = 315.4 |Apr precipitation mm = 443.2 |May precipitation mm = 600.0 |Jun precipitation mm = 392.2 |Jul precipitation mm = 262.2 |Aug precipitation mm = 135.4 |Sep precipitation mm = 63.2 |Oct precipitation mm = 54.9 |Nov precipitation mm = 135.2 |Dec precipitation mm = 352.3 |year precipitation mm = 3488.2 |unit precipitation days = 1.0 mm |Jan precipitation days = 22.8 |Feb precipitation days = 20.5 |Mar precipitation days = 20.4 |Apr precipitation days = 22.1 |May precipitation days = 26.6 |Jun precipitation days = 25.2 |Jul precipitation days = 21.2 |Aug precipitation days = 14.0 |Sep precipitation days = 6.4 |Oct precipitation days = 6.4 |Nov precipitation days = 12.4 |Dec precipitation days = 21.5 |year precipitation days = 219.6 |Jan humidity = 82 |Feb humidity = 80 |Mar humidity = 82 |Apr humidity = 84 |May humidity = 85 |Jun humidity = 82 |Jul humidity = 78 |Aug humidity = 74 |Sep humidity = 71 |Oct humidity = 71 |Nov humidity = 76 |Dec humidity = 81 |Jan sun = 102.4 |Feb sun = 90.2 |Mar sun = 117.3 |Apr sun = 121.1 |May sun = 121.4 |Jun sun = 153.2 |Jul sun = 200.1 |Aug sun = 231.3 |Sep sun = 250.8 |Oct sun = 256.6 |Nov sun = 208.1 |Dec sun = 150.3 |year sun = 2002.8 |source 1 = [[Meteo France]]<ref>{{cite web|url=http://www.meteofrance.com/climat/france/cayenne/97307001/normales|title=Climatological Information for Cayenne, France|publisher=Meteo France|date=7 August 2019|access-date=31 December 2021|archive-date=27 July 2020|archive-url=https://web.archive.org/web/20200727183826/http://www.meteofrance.com/climat/france/cayenne/97307001/normales|url-status=dead}}</ref><ref> {{cite web | url = https://donneespubliques.meteofrance.fr/FichesClim/FICHECLIM_97307001.pdf | title = CAYENNE–MATOURY (973) | work = Fiche Climatologique: Statistiques 1981–2010 et records | publisher = Meteo France | language = fr | access-date = 28 August 2022}}</ref> }} {{Weather box|width=auto |location = Cayenne <small>(Suzuni, altitude 4m, 1991−2020 normals, extremes 1972−present)</small> |single line = Y |metric first = Y |Jan record high C = 31.4 |Feb record high C = 31.9 |Mar record high C = 32.2 |Apr record high C = 34.0 |May record high C = 33.4 |Jun record high C = 33.5 |Jul record high C = 34.4 |Aug record high C = 33.3 |Sep record high C = 34.4 |Oct record high C = 33.7 |Nov record high C = 33.6 |Dec record high C = 33.3 |Jan record low C = 20.3 |Feb record low C = 20.5 |Mar record low C = 21.4 |Apr record low C = 21.2 |May record low C = 21.2 |Jun record low C = 20.5 |Jul record low C = 20.4 |Aug record low C = 20.3 |Sep record low C = 20.3 |Oct record low C = 20.8 |Nov record low C = 20.5 |Dec record low C = 20.1 |Jan high C = 28.7 |Feb high C = 28.7 |Mar high C = 29.0 |Apr high C = 29.3 |May high C = 29.2 |Jun high C = 29.4 |Jul high C = 30.0 |Aug high C = 30.4 |Sep high C = 30.7 |Oct high C = 30.9 |Nov high C = 30.4 |Dec high C = 29.5 |year high C = 29.7 |Jan mean C = 26.5 |Feb mean C = 26.5 |Mar mean C = 26.8 |Apr mean C = 27.1 |May mean C = 26.8 |Jun mean C = 26.5 |Jul mean C = 26.6 |Aug mean C = 27.0 |Sep mean C = 27.4 |Oct mean C = 27.7 |Nov mean C = 27.5 |Dec mean C = 27.0 |year mean C = 27.0 |Jan low C = 24.2 |Feb low C = 24.4 |Mar low C = 24.7 |Apr low C = 24.8 |May low C = 24.3 |Jun low C = 23.6 |Jul low C = 23.3 |Aug low C = 23.7 |Sep low C = 24.1 |Oct low C = 24.5 |Nov low C = 24.6 |Dec low C = 24.5 |year low C = 24.2 |precipitation colour = green |Jan precipitation mm = 370.9 |Feb precipitation mm = 248.8 |Mar precipitation mm = 259.8 |Apr precipitation mm = 355.3 |May precipitation mm = 517.9 |Jun precipitation mm = 373.6 |Jul precipitation mm = 155.2 |Aug precipitation mm = 79.1 |Sep precipitation mm = 39.3 |Oct precipitation mm = 51.5 |Nov precipitation mm = 104.8 |Dec precipitation mm = 259.6 |year precipitation mm = 2815.8 |unit precipitation days = 1.0 mm |Jan precipitation days = 20.5 |Feb precipitation days = 16.2 |Mar precipitation days = 16.6 |Apr precipitation days = 19.0 |May precipitation days = 24.3 |Jun precipitation days = 23.4 |Jul precipitation days = 15.5 |Aug precipitation days = 8.8 |Sep precipitation days = 5.0 |Oct precipitation days = 6.3 |Nov precipitation days = 10.8 |Dec precipitation days = 18.9 |year precipitation days = 185.1 |source 1 = [[Météo-France]]<ref>{{cite web | url = https://donneespubliques.meteofrance.fr/FichesClim/FICHECLIM_97302005.pdf | title=Fiche Climatologique Statistiques 1991-2020 et records | language = fr | publisher = [[Météo-France]] | access-date = August 28, 2022}}</ref>}}
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