Climate Change Chart of Manila, Philippines

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.59 °C compared with the earlier reference period. This is an unweighted mean of the monthly means, not a day-weighted annual average, and it describes mean temperatures rather than daytime maximum temperatures. The largest monthly increase was in May, with a difference of +0.90 °C. That identifies the strongest increase among the reported monthly differences; it does not imply the same change in every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall increased by a difference of +1.27 mm/day compared with the earlier reference period. This is an unweighted mean of monthly means, not a day-weighted annual average, and the figures describe daily averages rather than monthly rainfall totals. The largest monthly increase in mean daily rainfall occurred in September, at a difference of +3.47 mm/day. In contrast, March had the largest monthly decrease, with a difference of -0.41 mm/day; these two months show that the overall average does not describe every month's change.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.28 hours/day compared with the earlier reference period. This unweighted mean across monthly averages is not a day-weighted annual figure, and it summarizes the calendar months rather than implying an identical change in each one. The monthly differences varied: June recorded the largest increase, at a difference of +0.30 hours/day, while August recorded the largest decrease, at a difference of -0.93 hours/day. These are differences in mean daily sunshine hours, not measures of total sunshine over each month.