Climate Change Chart of Warsaw, Poland

Overview of climate changes

Temperature changes

Monthly mean temperatures were higher on average, with an unweighted difference across calendar months of +2.20 °C compared with the earlier reference period; this summarizes the monthly means rather than daytime maximum temperatures. The largest monthly increase was in January, where the difference was +5.11 °C. This identifies the strongest increase among the supplied monthly comparisons, not a change that necessarily occurred in every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.36 mm/day compared with the earlier reference period. This unweighted mean summarizes monthly averages; it is not a day-weighted annual average or a monthly rainfall total. The clearest monthly increase was in May, with a difference of +0.87 mm/day in mean daily rainfall. By contrast, November had the largest monthly decrease, a difference of -0.30 mm/day. These are daily-average comparisons for those months, not changes in monthly totals.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -0.37 mm/day, a decrease compared with the earlier reference period. This is an unweighted summary of monthly daily means, not an annual total. The largest monthly decrease was in February, with a difference of -2.17 mm/day in mean daily snowfall. In April, the largest monthly increase was a difference of +0.90 mm/day. These contrasting monthly differences show why the overall mean does not describe every month's comparison.

Changes in sunshine duration

The unweighted mean difference in mean daily sunshine duration, averaged across calendar months, was +0.02 hours/day. This small aggregate difference does not imply that sunshine changed by the same amount in each month. Monthly differences varied in direction: June had the largest increase, at +0.77 hours/day, while January had the largest decrease, at -0.59 hours/day. These describe mean daily sunshine hours in the named months, rather than every day's conditions.