Climate Change Chart of Vigan, Philippines

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.99 °C in the more recent reference period; this is an unweighted comparison of month-level means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in May, with a difference of +1.54 °C. This identifies the strongest month-level increase in the supplied comparison, rather than implying that every month warmed by the same amount.

Changes in rainfall

Across calendar months, mean daily rainfall had an average difference of +0.77 mm/day compared with the earlier reference period. This unweighted mean of monthly means summarizes the overall month-level comparison; it is not a monthly rainfall total or a day-weighted annual average. The largest monthly increase in mean daily rainfall occurred in August, with a difference of +7.17 mm/day. By contrast, June had the largest monthly decrease, with a difference of -3.83 mm/day. These are daily-mean differences for the named months, not changes in their monthly totals.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration shows a difference of -0.24 hours/day in the more recent period. This is an unweighted average of monthly mean differences, so it describes an aggregate rather than a uniform change in every month. The largest monthly increase in mean daily sunshine was in June, with a difference of +0.69 hours/day. The largest monthly decrease was in August, at a difference of -1.69 hours/day; these contrasting month-level results show why the overall mean should not be read as describing each month individually.