Climate Change Chart of Chiang Rai, Thailand

Overview of climate changes

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +0.28 °C compared with the earlier reference period. This is an unweighted summary of the monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in November, with a difference of +1.16 °C. By contrast, February had the largest monthly decrease, a difference of -0.88 °C. These month-specific contrasts show that the overall mean difference does not describe every calendar month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.43 mm/day. This unweighted summary of monthly means describes daily rainfall amounts, not accumulated monthly totals, and does not imply that rainfall increased in every month. The largest monthly increase occurred in July, at a difference of +3.13 mm/day in mean daily rainfall. In September, the largest monthly decrease was a difference of -2.21 mm/day. The opposing monthly changes give a more detailed picture than the overall mean alone.

Changes in sunshine duration

Across calendar months, the unweighted mean difference in daily sunshine duration was -0.14 hours/day; this summarizes monthly mean daily hours rather than day-weighted annual sunshine. It is an aggregate comparison, so it should not be read as a decrease in every month. The largest increase in mean daily sunshine was in September, with a difference of +0.88 hours/day. The largest decrease was in July, where the difference was -0.85 hours/day. Together, these contrasting monthly differences show why the overall average does not capture the full month-to-month pattern.