Climate Change Chart of Suwon, South Korea

Overview of climate changes

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +0.93 °C compared with the earlier reference period; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in January, at a difference of +2.06 °C. By contrast, November / December had the largest monthly decreases, with a difference of -0.01 °C; those small declines contrast with the broader mean increase without implying that every month became warmer.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of +0.51 mm/day in the more recent period. This unweighted mean of monthly daily averages summarizes the overall comparison; it is not a monthly rainfall total and does not describe every month individually. The largest monthly increase was in August, with a difference of +4.03 mm/day, while June recorded the largest monthly decrease, a difference of -1.68 mm/day. The contrast shows that the mean shift did not apply uniformly across the monthly comparisons.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.31 hours/day compared with the earlier reference period. This is an unweighted comparison of monthly daily averages, rather than a day-weighted annual figure. The largest monthly decrease occurred in August, with a difference of -1.18 hours/day; July had the largest increase, at a difference of +0.59 hours/day. These monthly contrasts help qualify the mean decrease and do not indicate that daily sunshine changed by the same amount in every month.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -0.03 mm/day in the more recent period. This small mean difference describes the unweighted comparison of monthly daily averages, not monthly snowfall totals; it does not imply snowfall was absent or that every month changed in the same way. The largest monthly decrease was in January, with a difference of -0.80 mm/day, while the largest increase occurred in February, at a difference of +0.31 mm/day. The opposing monthly differences provide context for the small overall mean change without suggesting a uniform shift in snowfall.