Climate Change Chart of Siem Reap, Cambodia

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.80 °C compared with the earlier reference period. This is an unweighted mean of the monthly means, not a day-weighted annual average, and describes the aggregate rather than every month or daytime maximum temperatures. The largest monthly increase was in March, at a difference of +1.59 °C; that identifies the strongest increase, not a uniform change throughout the year.

Changes in rainfall

Mean daily rainfall, rather than monthly totals, averaged across calendar months shows a difference of +0.59 mm/day compared with the earlier reference period. This is an unweighted average of the calendar-month means, so it does not imply that rainfall increased in every month. The largest monthly increase was in July, at a difference of +2.58 mm/day, while March had the largest decrease, a difference of -0.91 mm/day. These contrasting monthly changes show why the overall average should not be read as a description of each month's daily rainfall.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months shows a difference of -0.85 hours/day compared with the earlier reference period. This unweighted average summarizes the monthly means; it does not mean that sunshine declined by the same amount in every month. The largest monthly decrease occurred in July, with a difference of -2.22 hours/day. That monthly extreme is distinct from the overall average and describes mean daily hours, not a monthly total.