Climate Change Chart of Roseau, Dominica

Overview of climate changes

Temperature changes

The mean difference across calendar months was +0.64 °C, an aggregate comparison of monthly mean temperatures rather than a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in September, with a difference of +1.07 °C; that identifies the strongest increase among the reported monthly differences, not a continuous change through the intervening years.

Changes in rainfall

Mean daily rainfall differed by -0.15 mm/day when averaged across calendar months, so this aggregate does not imply that rainfall decreased in every month. The monthly differences varied: March had the largest increase, a difference of +0.88 mm/day, while August had the largest decrease, a difference of -1.61 mm/day. These are changes in daily means, not monthly rainfall totals, and describe differences between the reference periods rather than a continuous trend.

Changes in sunshine duration

Mean daily sunshine duration had an average difference across calendar months of -0.08 hours/day; this summarizes monthly means and does not establish the same change in every month. The largest monthly decrease occurred in October, with a difference of -0.51 hours/day, whereas August recorded the largest increase, a difference of +0.14 hours/day. These monthly contrasts show that the period-to-period differences were not uniform, but do not indicate a continuous change between the reference periods.