Climate Change Chart of Jyväskylä, Finland

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperatures show a difference of +1.94 °C between the reference periods; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in January, with a difference of +4.54 °C compared with the earlier reference period. The largest monthly decrease was in July, a difference of -0.11 °C. These monthly contrasts describe differences between period averages, not a continuous change over time.

Changes in snowfall

Mean daily snowfall, not monthly snowfall totals, increased on average across calendar months, with a difference of +0.93 mm/day. This is an unweighted mean across the monthly averages. The largest monthly increase was in January, with a difference of +3.16 mm/day. The largest monthly decrease in mean daily snowfall occurred in November, with a difference of -0.98 mm/day. These period-average differences do not establish a continuous trend or imply that snowfall was absent in either period.

Changes in rainfall

Mean daily rainfall, rather than monthly totals, was higher averaged across calendar months, with a difference of +0.23 mm/day; this is an unweighted average of the monthly means. The largest monthly increase occurred in July, where the difference was +0.74 mm/day. In contrast, June had the largest monthly decrease in mean daily rainfall, with a difference of -0.24 mm/day. These figures compare average daily amounts for the periods and do not describe every day or month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months showed a difference of -0.14 hours/day; the mean is unweighted across monthly averages, not a day-weighted annual figure. The largest monthly increase was in June, with a difference of +1.03 hours/day. The largest monthly decrease in mean daily sunshine duration occurred in July, with a difference of -1.05 hours/day. Monthly differences need not apply to each day within a month.