Climate Change Chart of Alofi, Niue

Overview of climate changes

Temperature changes

Across calendar months, the unweighted mean difference in monthly mean temperature was an increase of +0.53 °C; this summarizes the monthly averages and is not a measure of daytime maximum temperatures or a change in every month. The largest monthly increase was in January, with a difference of +0.79 °C compared with the earlier reference period.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.11 mm/day. This is an unweighted summary of monthly daily means, not a change in monthly rainfall totals or a uniform shift in every month. The clearest monthly contrasts in the supplied differences were an increase of +2.36 mm/day in February and a decrease of -1.77 mm/day in November. These refer to mean daily rainfall, so they describe average daily amounts within those monthly comparisons rather than monthly totals.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.28 hours/day compared with the earlier reference period. This unweighted mean describes the aggregate of monthly averages, not each month's sunshine or a continuous change over time. The largest monthly decrease was in February, with a difference of -1.15 hours/day. By contrast, July had the largest monthly increase, at +0.10 hours/day; these are differences in mean daily sunshine duration.