Climate Change Chart of Saint Martin, Saint Martin (French part)

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.65 °C compared with the earlier reference period; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in September, at +0.95 °C. That marks the strongest increase among the reported monthly differences, rather than implying the same change in every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall shows a difference of -0.66 mm/day; this unweighted summary of monthly means is not a day-weighted annual average or a monthly rainfall total. The largest monthly decrease was in August, with a difference of -1.65 mm/day, while February had the largest increase, at +0.19 mm/day. These contrasting monthly differences show why the overall mean should not be read as a description of every month; the figures refer to average daily amounts, not accumulated rainfall.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of +0.02 hours/day compared with the earlier period. This is an unweighted mean of monthly averages, not a day-weighted annual figure, and does not mean that every month changed by that amount. The largest increase occurred in September, with a difference of +0.14 hours/day, whereas the largest decrease was in April, at -0.10 hours/day. The monthly differences therefore varied in direction even as the across-month mean showed a small increase.