Climate Change Chart of Tomsk (Sibiria), Russian Federation

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.98 °C compared with the earlier reference period; this unweighted comparison summarizes monthly means rather than day-weighted annual temperature or daytime highs. The largest monthly increase was in December, with a difference of +5.93 °C. By contrast, September had the largest monthly decrease, a difference of -0.26 °C. These extrema describe particular monthly averages, not changes shared by every month.

Changes in snowfall

Mean daily snowfall averaged across calendar-month means had a difference of +0.66 mm/day; this is an unweighted summary, not a monthly total. The largest monthly increase was in December, at a difference of +4.28 mm/day, while April saw the largest decrease, a difference of -2.32 mm/day. These comparisons describe average daily snowfall by month and do not indicate that the same direction applied throughout the year.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.39 hours/day. The monthly extremes show why that summary should not be read as a uniform change: March had the largest decrease, a difference of -1.22 hours/day, whereas June had the largest increase, a difference of +0.31 hours/day. These are differences in average daily hours for the named months, not a claim about every day’s sunshine.

Changes in rainfall

Mean daily rainfall, rather than monthly totals, had an unweighted average difference across calendar-month means of -0.02 mm/day. Monthly changes varied in direction: October recorded the largest increase, a difference of +0.24 mm/day, while June recorded the largest decrease, a difference of -0.53 mm/day. The overall mean therefore summarizes the set of monthly daily averages; it does not imply that rainfall decreased in every month or on every day.