Climate Change Chart of Osaka, Japan

Overview of climate changes

Temperature changes

Across calendar months, the unweighted mean difference in monthly mean temperature was an increase of +1.07 °C; this summarizes the monthly means rather than day-weighted annual temperatures or daytime highs. The largest monthly increase was in March, with a difference of +1.83 °C compared with the earlier reference period.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, averaged across calendar months showed an increase of +1.57 mm/day in the more recent period; this is an unweighted summary of the monthly means, not a statement that every month was wetter. The largest monthly increase was in August, where mean daily rainfall had a difference of +2.85 mm/day.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.52 hours/day, a decrease in the more recent period; this unweighted summary of monthly means does not imply the same change in every month. The largest monthly decrease was in January, with a difference of -0.97 hours/day in mean daily sunshine duration.

Changes in snowfall

Mean daily snowfall, not monthly snowfall totals, averaged across calendar months had a difference of -0.06 mm/day, a decrease in the more recent period. This is an unweighted summary of the monthly means and does not mean snowfall decreased in every month. The largest monthly decrease was in February, with a difference of -0.49 mm/day; by contrast, January recorded the largest monthly increase, a difference of +0.13 mm/day.