Climate Change Chart of Phnom Penh, Cambodia

Overview of climate changes

Changes in sunshine duration

Mean daily sunshine duration decreased on average across calendar months, with a difference of -0.60 hours/day. This unweighted mean of monthly values describes an overall comparison, not a decrease in every month. The largest monthly decline was in July, at -1.81 hours/day per day, while the largest increase was in March, at +0.04 hours/day per day. The monthly contrasts show why the overall mean should not be read as a uniform change throughout the year.

Changes in rainfall

Mean daily rainfall was higher on average across calendar months, with a difference of +0.69 mm/day. This is an unweighted comparison of monthly means, not a change in annual rainfall totals, and it does not imply that rainfall increased in every month. The clearest monthly increase was in October, at +1.67 mm/day; by contrast, February had the largest monthly decrease, a difference of -0.21 mm/day. These daily averages describe typical amounts, not monthly totals.

Temperature changes

Monthly mean temperature was higher on average across calendar months in the more recent period, with a difference of +1.10 °C. This unweighted comparison summarizes the monthly means; it does not mean that every month warmed by the same amount or describe daytime maximum temperatures. The largest monthly increase was in May, at +1.64 °C compared with the earlier reference period.