Climate Change Chart of Medan, Indonesia

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.90 °C between the reference periods. This is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in January, with a difference of +1.06 °C. That identifies the strongest increase among the supplied monthly differences, rather than implying the same change occurred in every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall has a difference of +1.88 mm/day. This unweighted comparison of monthly means describes an aggregate, not rainfall in every individual month; the amounts are daily means, not monthly totals. The largest monthly increase in mean daily rainfall was in December, with a difference of +6.37 mm/day. By contrast, September had the largest monthly decrease, a difference of -1.88 mm/day; these contrasting monthly results show why the overall mean should not be read as a uniform change.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration shows a difference of -1.64 hours/day between the reference periods. This is an unweighted mean across monthly averages, rather than a day-weighted annual figure. The largest monthly decrease in mean daily sunshine duration occurred in November, with a difference of -2.75 hours/day. This marks the strongest decrease among the supplied monthly differences and does not establish that every month changed by the same amount.