Climate Change Chart of Gdansk, Poland

Overview of climate changes

Temperature changes

Across calendar months, monthly mean temperatures show an unweighted mean difference of +2.07 °C in the more recent period. This summarizes the month-by-month averages rather than a day-weighted annual average, and it does not mean every month changed by the same amount. The largest monthly increase was in January, with a difference of +4.73 °C compared with the earlier reference period; these are monthly means, not daytime maximum temperatures.

Changes in snowfall

Mean daily snowfall averaged across calendar months had an unweighted mean difference of -0.49 mm/day compared with the earlier reference period. The monthly differences identify a contrasting pattern: the largest decrease was in March, with a difference of -2.11 mm/day, while May recorded the largest increase, at +0.01 mm/day. These figures describe mean daily amounts, not monthly snowfall totals, and the overall mean summarizes calendar-month averages rather than a day-weighted annual average.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had an unweighted mean difference of +0.20 mm/day compared with the earlier reference period. This describes the average of the monthly means, not monthly rainfall totals or a day-weighted annual figure. The monthly pattern was not uniform: October had the largest increase, a difference of +0.66 mm/day, while April had the largest decrease, a difference of -0.22 mm/day. These month-specific changes refer to mean daily amounts.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had an unweighted mean difference of +0.04 hours/day in the more recent period; this is an average of monthly means, not a day-weighted annual measure. Monthly differences varied: the largest increase occurred in February, at +0.84 hours/day, while the largest decrease was in January, at -0.79 hours/day. These differences describe average daily sunshine within the named months, rather than conditions on every day.