Climate Change Chart of Xi'an, China

Overview of climate changes

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +0.29 °C; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime highs. The month with the largest increase was March, with a difference of +1.68 °C. By contrast, November had the largest decrease, a difference of -0.27 °C. These monthly extremes show that the overall mean difference does not describe every month's change.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.64 hours/day, an unweighted comparison of monthly means rather than a day-weighted annual figure. The largest monthly decrease was in October, with a difference of -1.29 hours/day. In August, the largest increase was a difference of +0.37 hours/day. These opposing monthly changes make clear that the aggregate difference does not represent every month; the values describe mean daily hours, not total sunshine over a month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -1.34 mm/day. This unweighted mean of monthly averages describes a broad comparison, not a change applying to every month, and the figures are daily amounts rather than monthly totals. The largest monthly decrease occurred in July, with a difference of -4.08 mm/day; this is a month-specific contrast, not a summary of rainfall on every day.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -0.20 mm/day. This is an unweighted mean of monthly averages, not a day-weighted annual average, and it does not imply that snowfall changed uniformly from month to month. The largest decrease was in December, with a difference of -1.20 mm/day, while the largest increase occurred in November, with a difference of +0.32 mm/day. These are differences in mean daily amounts, not monthly snowfall totals.