Climate Change Chart of Port Vila, Vanuatu

Overview of climate changes

Temperature changes

Averaged across calendar months, the monthly mean temperature shows a difference of +0.32 °C compared with the earlier reference period. This unweighted comparison summarizes the month-by-month means; it is not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase in mean temperature was in November, with a difference of +0.70 °C. This identifies the strongest increase among the supplied monthly changes, rather than implying that every month warmed by the same amount.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.24 mm/day. This is an unweighted comparison of monthly means, not a change in annual rainfall totals, and it does not mean that rainfall increased in every month. The largest monthly decrease in mean daily rainfall occurred in September, with a difference of -2.55 mm/day. In contrast, the largest monthly increase was in October, at +2.16 mm/day; these opposing monthly changes show why the overall mean difference does not describe each month individually.

Changes in sunshine duration

Across calendar months, mean daily sunshine duration had a difference of -0.12 hours/day compared with the earlier period. This unweighted average of monthly means describes an aggregate shift, not a change that necessarily applied to every month. The largest monthly decrease in mean daily sunshine was in November, with a difference of -0.46 hours/day. The largest monthly increase occurred in December, at +0.13 hours/day, so the month-specific changes were not uniform.