Climate Change Chart of Charlotte Amalie, Virgin Islands (U.S.)

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.71 °C in the more recent period. This is an unweighted mean of the monthly means, not a day-weighted annual average, and it describes the aggregate rather than every month. The largest monthly increase was in September, with a difference of +1.00 °C; this identifies the strongest increase among the reported monthly changes, not a daytime maximum.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of -0.80 mm/day compared with the earlier reference period. This unweighted mean summarizes monthly daily averages, not monthly rainfall totals, and does not imply that every month was drier. The largest monthly decrease occurred in October, with a difference of -2.12 mm/day, marking the strongest reported monthly decline rather than a uniform change throughout the year.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.05 hours/day in the more recent period. This is an unweighted average of monthly means, so it summarizes the calendar months overall rather than describing each month individually. The monthly pattern was not uniform: the largest decrease was in July, with a difference of -0.35 hours/day, while the largest increase was in September, with a difference of +0.20 hours/day. These extrema show contrasting monthly changes; they do not establish a continuous trend between the reference periods.