Climate Change Chart of Kyoto, Japan

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.10 °C compared with the earlier reference period. This is an unweighted mean of monthly means, not a day-weighted annual average, and it describes the aggregate rather than every month; it also concerns mean temperatures, not daytime highs. The largest monthly increase was in March, with a difference of +1.91 °C. This identifies the strongest increase among the reported monthly changes, not a uniform shift across all months.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of +1.96 mm/day. This unweighted comparison of monthly means is not a day-weighted annual average, and the daily measure should not be read as a change in monthly rainfall totals. The largest monthly increase in mean daily rainfall occurred in August, at a difference of +4.00 mm/day. That monthly result highlights where the increase was greatest; it does not imply that rainfall rose in every month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.59 hours/day. This is an unweighted average across monthly means rather than a day-weighted annual figure, so it summarizes the comparison without describing every month’s conditions. The largest monthly decrease in mean daily sunshine duration was in January, with a difference of -1.19 hours/day. This marks the most pronounced reported monthly decrease, not a decrease of the same size throughout the year.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of +0.14 mm/day. This unweighted comparison of monthly means is not a day-weighted annual average, and the small aggregate difference does not mean snowfall was absent in either period. The largest monthly increase in mean daily snowfall was in January, at a difference of +1.54 mm/day. By contrast, the largest monthly decrease was in March, with a difference of -0.32 mm/day; these opposing monthly changes show why the modest average difference does not describe every month.