Climate Change Chart of Saint Petersburg, Russian Federation

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +2.15 °C compared with the earlier reference period; this unweighted mean summarizes the monthly averages, rather than a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase in mean temperature occurred in January, with a difference of +4.07 °C. This identifies the strongest monthly increase in the supplied comparison, not a change shared equally by every month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, shows a difference of -0.15 hours/day compared with the earlier reference period. This unweighted summary describes the monthly means, not a day-weighted annual average. The largest monthly increase in mean daily sunshine was in June, with a difference of +1.43 hours/day; the largest monthly decrease was in October, with a difference of -0.81 hours/day. These contrasting monthly changes help put the smaller overall mean difference in context, without implying the same direction of change in every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall shows a difference of +0.34 mm/day compared with the earlier reference period. This is an unweighted summary of the monthly means, not a day-weighted annual average or a monthly rainfall total. The largest monthly increase in mean daily rainfall was in August, with a difference of +1.30 mm/day. In contrast, September had the largest monthly decrease, a difference of -0.48 mm/day. These monthly figures describe average daily amounts and show that the overall mean difference does not apply uniformly across months.

Changes in snowfall

Averaged across calendar months, mean daily snowfall shows a difference of +0.02 mm/day compared with the earlier reference period. The small difference is shown at the supplied precision and should not be read as evidence that snowfall was absent or unchanged beyond that precision; the mean is also unweighted across calendar-month means. Monthly snowfall differences varied: December had the largest increase, a difference of +1.67 mm/day, while November had the largest decrease, a difference of -2.33 mm/day. These are mean daily amounts rather than monthly totals, and the contrasting extremes do not describe every month.