Climate Change Chart of Saint Barthelemy (St. Barts), Saint Barthélemy

Overview of climate changes

Temperature changes

Across calendar months, the unweighted mean difference in monthly mean temperature was +0.72 °C compared with the earlier reference period; this summarizes the monthly averages and does not mean every month changed by the same amount. The largest monthly increase was in September, at +1.01 °C. These are monthly mean temperatures, not daytime highs, so they do not show how warm an individual afternoon might feel.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had a difference of -0.66 mm/day. The largest monthly decrease was in August, at -1.79 mm/day, while the largest increase was in February, at +0.21 mm/day. These figures describe average daily amounts, not monthly rainfall totals or the number of rainy days; they therefore do not establish how often rain interrupted outdoor plans.

Changes in sunshine duration

Mean daily sunshine duration had an unweighted average difference across calendar months of -0.01 hours/day. The largest monthly decrease was in April, at -0.16 hours/day, while the largest increase was in May, at +0.13 hours/day. These averages describe sunshine duration, not the exact conditions visitors would encounter on any particular day.