Climate Change Chart of Jeju, South Korea

Overview of climate changes

Changes in snowfall

Mean daily snowfall—not monthly totals—averaged across calendar months shows a difference of +0.82 mm/day. This unweighted comparison of monthly means does not describe snowfall in every month, and it should not be read as a continuous trend. The largest monthly increase occurred in December, with a difference of +4.23 mm/day; the largest decrease was in March, at -0.04 mm/day. Together, these contrasts indicate that the period-to-period differences varied across the calendar months; they do not establish what happened on any particular day.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, averaged across calendar months shows a difference of +1.36 mm/day compared with the earlier reference period. This unweighted mean summarizes the set of calendar-month averages and does not imply the same difference in every month. The largest monthly increase was in September, at +5.43 mm/day, whereas June recorded the largest decrease, a difference of -1.23 mm/day. These values describe period-to-period contrasts in daily means, not a continuous trend or changes in individual daily events.

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.71 °C; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in March, with a difference of +1.37 °C, while December had the largest decrease, at -0.02 °C. These monthly contrasts describe differences between the reference periods, not a continuous change through time.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months shows a difference of -0.38 hours/day. This unweighted summary of monthly means indicates an overall lower mean in the more recent period, but does not mean that sunshine duration decreased in every month. The largest monthly decrease was in April, with a difference of -0.84 hours/day; by contrast, July had the largest increase, at +0.12 hours/day. The monthly extremes therefore show that the comparison varied by month, while remaining differences between reference periods rather than evidence of a continuous trend.