Climate Change Chart of Koh Samui, Thailand

Overview of climate changes

Temperature changes

The unweighted mean difference, averaged across calendar months, was an increase of +1.36 °C in monthly mean temperature; this summarizes the set of monthly averages rather than describing every month or a continuous change between periods. These are monthly means, not daytime maximum temperatures. August had the largest monthly increase, a difference of +1.84 °C compared with the earlier reference period.

Changes in rainfall

Mean daily rainfall had an unweighted decrease of -0.97 mm/day when averaged across calendar months. This is a comparison of monthly means, not a day-weighted annual average or a monthly rainfall total, and it does not imply that rainfall decreased in every month. The monthly differences varied in direction: January showed the largest increase, a difference of +2.12 mm/day, while October showed the largest decrease, a difference of -3.10 mm/day. These are differences in mean daily amounts in the more recent period relative to the earlier one.

Changes in sunshine duration

Mean daily sunshine duration had a small unweighted decrease of -0.03 hours/day averaged across calendar months; that aggregate does not mean every month had less sunshine. The monthly pattern included an increase in March, the largest monthly increase at a difference of +0.24 hours/day, and a decrease in November, the largest monthly decrease at a difference of -0.32 hours/day. These figures compare monthly mean daily hours between the reference periods, rather than representing total sunshine over a month.