Climate Change Chart of Cayenne, French Guiana

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.71 °C compared with the earlier reference period; this unweighted mean summarizes monthly averages and is not a measure of daytime maximum temperatures. The largest monthly increase in mean temperature was in May, with a difference of +0.88 °C. This identifies the strongest increase among the monthly comparisons, rather than implying that every month's mean changed by the same amount.

Changes in rainfall

Averaged across calendar months, mean daily rainfall shows a difference of +1.88 mm/day in the more recent period. This is an unweighted summary of monthly mean daily amounts, not a day-weighted annual average or a monthly rainfall total. The largest monthly increase in mean daily rainfall occurred in June, with a difference of +4.43 mm/day. In contrast, March had the largest decrease, a difference of -0.22 mm/day; these identify contrasting monthly changes, not totals accumulated over those months.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration shows a difference of -0.81 hours/day compared with the earlier reference period. This unweighted mean describes the monthly averages and should not be read as a change of the same size in every month. The largest monthly decrease in mean daily sunshine was in February, with a difference of -1.71 hours/day. The monthly comparison highlights where the decrease was greatest, while the mean daily measure does not describe every individual day.