Climate Change Chart of Tianjin, China

Overview of climate changes

Temperature changes

Monthly mean temperature averaged across calendar months shows a difference of +0.99 °C compared with the earlier reference period; this unweighted mean summarizes the calendar-month averages, rather than a day-weighted annual figure or daytime maximum temperatures. The largest monthly increase was in March, with a difference of +2.75 °C. That marks the strongest increase among the monthly means, not a claim that every month warmed by the same amount.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of -0.72 mm/day in the more recent period. This unweighted comparison of monthly means describes daily amounts, not monthly rainfall totals, and does not imply the same change in every month. The clearest monthly reduction was in August, where mean daily rainfall had a difference of -3.20 mm/day. By contrast, October recorded the largest monthly increase, with a difference of +0.21 mm/day; the opposing changes show why the overall mean should not be read as a uniform month-by-month pattern.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.30 hours/day compared with the earlier period. This is an unweighted summary of the monthly means, not a day-weighted annual average or a description of each month's conditions. The largest monthly decrease occurred in October, with a difference of -1.07 hours/day. In August, the largest increase was a difference of +0.40 hours/day, underscoring that the monthly sunshine comparisons did not all move in the same direction.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of +0.04 mm/day in the more recent period. This small aggregate difference summarizes unweighted monthly means and does not mean snowfall changed by that amount in every month; the measure is a daily mean, not a monthly total. The largest monthly increase was in November, with a difference of +0.77 mm/day, while the largest decrease was in March, with a difference of -0.59 mm/day. These contrasting monthly differences provide useful context for the modest overall mean change.