Climate Change Chart of Chengdu, China

Overview of climate changes

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, has a difference of -0.81 hours/day. This is an unweighted summary of monthly means, rather than a day-weighted annual figure, and does not imply the same change in every month. The largest monthly decrease was in December, with a difference of -1.25 hours/day; by contrast, the largest monthly increase was in August, with a difference of +0.23 hours/day. Together, these monthly contrasts show why the overall mean should not be read as a uniform month-by-month shift.

Changes in rainfall

Averaged across calendar months, mean daily rainfall has a difference of -0.56 mm/day. This unweighted mean of monthly values describes an overall decrease, not a change in every month or in monthly rainfall totals. The clearest contrasting monthly changes were in August, with a difference of -4.48 mm/day, and October, with a difference of +0.72 mm/day. These are changes in mean daily amounts; the increase in one month does not overturn the overall decrease across calendar-month means.

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.73 °C. This is an unweighted comparison of the monthly means, not a day-weighted annual average or a statement about daytime maximum temperatures. The largest monthly increase was in August, with a difference of +1.44 °C; that single-month result does not mean every month warmed by the same amount.

Changes in snowfall

For mean daily snowfall, the unweighted average across calendar-month means has a difference of +0.02 mm/day. The largest monthly increase occurred in January, with a difference of +0.11 mm/day. These are small differences in the displayed measures, but they do not indicate that snowfall was absent; nor does the average imply an increase in every month. The figures describe mean daily amounts, not monthly snowfall totals.