Climate Change Chart of Gustavia, Saint Barthélemy

Overview of climate changes

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of -0.66 mm/day in the more recent period. This unweighted mean of monthly means describes an aggregate comparison, not a day-weighted annual total or a change shared by every month. Monthly differences varied in direction: the largest decrease was in August, with a difference of -1.79 mm/day, while February had the largest increase, at +0.21 mm/day. These figures describe mean daily rainfall, not monthly rainfall totals.

Temperature changes

Monthly mean temperature averaged across calendar months shows a difference of +0.72 °C compared with the earlier reference period; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in September, at +1.00 °C. This identifies the strongest increase among the supplied monthly differences, rather than indicating that every month warmed by the same amount.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.01 hours/day compared with the earlier reference period. This unweighted comparison summarizes the monthly means and should not be read as the same shift in every month. The largest monthly decrease was in April, at -0.16 hours/day, whereas the largest increase occurred in May, at +0.13 hours/day. These are differences in mean daily hours for the respective months, not a continuous change between the reference periods.