Climate Change Chart of Siquijor, Philippines

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.17 °C between the reference periods. This is an unweighted mean of the monthly means, not a day-weighted annual average, and it describes the aggregate rather than every month; the measure is not daytime maximum temperature. The largest monthly increase was in April, with a difference of +1.52 °C compared with the earlier reference period.

Changes in rainfall

Averaged across calendar months, mean daily rainfall shows a difference of +0.85 mm/day between the periods. This unweighted mean of monthly means is not a day-weighted annual average, and the daily measure should not be read as a monthly rainfall total or as a change shared by every month. The clearest monthly increase was in July, with a difference of +2.86 mm/day; by contrast, December had a decrease, with a difference of -0.52 mm/day. These monthly contrasts show why the across-month mean does not describe each month's change.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration shows a difference of -0.46 hours/day between the reference periods. This is an unweighted mean across calendar-month means, not a day-weighted annual figure, and does not imply the same change in each month. The largest monthly decrease was in January, with a difference of -1.28 hours/day. Both figures describe mean daily hours, rather than total sunshine accumulated over a month.