Climate Change Chart of Oulu, Finland

Overview of climate changes

Temperature changes

Monthly mean temperature was higher by a difference of +1.48 °C averaged across calendar months in the more recent period; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The strongest monthly increase was in February, with a difference of +3.33 °C. That identifies the largest increase among the supplied monthly comparisons, rather than describing every month's change.

Changes in snowfall

Mean daily snowfall increased by a difference of +0.65 mm/day averaged across calendar months; this is an unweighted comparison of monthly means, not a day-weighted annual average, and the amounts are daily means rather than monthly totals. The largest monthly increase was in December, with a difference of +3.24 mm/day, whereas the largest monthly decrease occurred in April, with a difference of -1.87 mm/day. The opposing monthly differences underline that the mean increase is an aggregate, not a description of snowfall in every month.

Changes in rainfall

Mean daily rainfall increased by a difference of +0.37 mm/day averaged across calendar months, an unweighted comparison of monthly means rather than a day-weighted annual average; these are daily amounts, not monthly totals. The largest monthly increase occurred in July, at a difference of +1.20 mm/day, while April had the largest monthly decrease, a difference of -0.24 mm/day. These contrasting months show that the overall mean difference does not describe rainfall changes in every month.

Changes in sunshine duration

Mean daily sunshine duration was lower by a difference of -0.19 hours/day averaged across calendar months. This is an unweighted mean of monthly means, not a day-weighted annual average, and it describes the aggregate comparison rather than the change in each month. The largest monthly decrease was in July, with a difference of -1.27 hours/day; in June, sunshine instead recorded the largest monthly increase, a difference of +0.79 hours/day.