Climate Change Chart of Dalian, China

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.94 °C. This is an unweighted comparison of the monthly means, rather than a day-weighted annual average, and it does not imply that every month changed by the same amount. May had the largest monthly increase, a difference of +1.92 °C, while October had the largest monthly decrease, a difference of -0.35 °C. These are monthly mean temperatures, not daytime maxima.

Changes in rainfall

Mean daily rainfall, rather than monthly totals, was lower on average across calendar months, with a difference of -0.29 mm/day. This unweighted mean summarizes the monthly averages and should not be read as a decrease in every month. The largest monthly decrease occurred in September, a difference of -0.98 mm/day; by contrast, November recorded the largest monthly increase, a difference of +0.29 mm/day. The monthly contrasts show why the overall mean does not describe every part of the year.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.23 hours/day. This unweighted comparison describes the monthly means, not a uniform shift in sunshine or a day-weighted annual total. The largest monthly decrease was in October, with a difference of -0.63 hours/day, whereas September had the largest monthly increase, a difference of +0.19 hours/day. These monthly differences indicate contrasting changes within the comparison, rather than the same change applying throughout the year.

Changes in snowfall

Mean daily snowfall also differed between the reference periods: averaged across calendar months, the difference was -0.01 mm/day. This is an unweighted mean of monthly averages, not a day-weighted annual figure, and its small size does not establish that snowfall was absent or unchanged beyond the displayed precision. The largest monthly decrease occurred in December, with a difference of -0.56 mm/day; November had the largest monthly increase, a difference of +0.45 mm/day. These opposing monthly differences provide context for the small overall mean difference.