Climate Change Chart of Cameron Highlands, Malaysia

Overview of climate changes

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.87 hours/day compared with the earlier reference period. This is an unweighted mean of monthly daily averages, rather than a day-weighted annual figure. The monthly pattern was not uniform: December recorded the largest decrease, a difference of -2.04 hours/day, whereas March had the largest increase, a difference of +0.03 hours/day. Those contrasting month-specific changes put the overall average in context; they do not imply that every month had less sunshine.

Changes in rainfall

Mean daily rainfall averaged across calendar months shows a difference of +0.03 mm/day. This small positive mean difference summarizes monthly averages; it is not a day-weighted annual average or a monthly rainfall total, and it does not mean every month became wetter. The clearest monthly contrasts went in opposite directions: December had the largest increase, a difference of +3.39 mm/day, while September had the largest decrease, a difference of -3.19 mm/day. These monthly differences help show why the near-even overall mean should not be read as uniform conditions across the calendar.

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.61 °C compared with the earlier reference period; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime highs. December had the largest monthly increase, with a difference of +1.93 °C. These figures describe period averages and the identified monthly change, not a continuous trend or a change that necessarily occurred in every month.