Climate Change Chart of Nagoya, Japan

Overview of climate changes

Temperature changes

Across calendar months, the unweighted mean of monthly mean temperatures was higher by a difference of +1.69 °C compared with the earlier reference period; this aggregate does not imply the same change in every month, and these are monthly means rather than daytime highs. The largest monthly increase was in March, with a difference of +2.52 °C in monthly mean temperature, indicating where the contrast between the reference periods was most pronounced for this measure.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, was lower by a difference of -0.44 hours/day in the more recent period. This unweighted aggregate does not mean that every month's sunshine declined. The largest monthly decrease was in April, where mean daily sunshine duration had a difference of -0.85 hours/day. In contrast, June recorded the largest monthly increase, a difference of +0.16 hours/day; together, these identify distinct monthly contrasts rather than a uniform shift through the year.

Changes in rainfall

Mean daily rainfall averaged across calendar months increased by a difference of +1.51 mm/day compared with the earlier reference period. This is an unweighted comparison of monthly means, not a day-weighted annual average or a change in monthly rainfall totals. The largest monthly increase in mean daily rainfall occurred in July, at a difference of +2.47 mm/day. This identifies the strongest monthly contrast in the supplied rainfall facts, without implying that rainfall rose in every month.

Changes in snowfall

Mean daily snowfall averaged across calendar months increased by a difference of +0.04 mm/day. The difference is small at the displayed precision, but it describes a positive aggregate change and does not establish the direction of change in every month. The largest monthly increase in mean daily snowfall was in February, at a difference of +0.39 mm/day; the largest decrease was in March, with a difference of -0.09 mm/day. These month-specific contrasts show why the positive average should not be read as an increase in every month.