Climate Change Chart of Villach, Austria

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.21 °C compared with the earlier reference period; this is an unweighted comparison of monthly means, not a day-weighted annual average or a continuous trend. The largest monthly increase was in January, with a difference of +3.24 °C. By contrast, May had the largest monthly decrease, a difference of -0.28 °C. These monthly means describe average temperatures, not daytime maximum temperatures.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, had an unweighted mean difference across calendar months of +0.24 mm/day compared with the earlier reference period. The largest monthly increase was in September, where the difference was +1.89 mm/day; the largest monthly decrease occurred in April, at -1.06 mm/day. These contrasts identify the strongest monthly changes in the supplied comparison, while the mean difference summarizes the months collectively and does not imply that every month became wetter.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.56 hours/day compared with the earlier reference period, an unweighted summary rather than a day-weighted annual figure. The monthly pattern was not uniform: May recorded the largest decrease, with a difference of -1.30 hours/day, while June had the largest increase, at +0.29 hours/day. These figures describe differences in average daily sunshine, not the duration on every individual day.

Changes in snowfall

Mean daily snowfall also differed between the reference periods. Averaged across calendar months, the unweighted mean difference was +0.16 mm/day; this is not a day-weighted annual average or a measure of monthly snowfall totals. The largest monthly increase occurred in March, with a difference of +2.09 mm/day, whereas the largest monthly decrease was in October, at -1.96 mm/day. The mean summarizes the comparison across calendar months and does not indicate that snowfall changed in the same direction in every month.