Climate Change Chart of Regina, Canada

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.00 °C between the reference periods; this is an unweighted comparison 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 +3.47 °C. By contrast, October had the largest monthly decrease, at -1.82 °C. These monthly contrasts show that the overall mean difference does not describe every month.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of +0.24 mm/day between the reference periods, based on an unweighted comparison of monthly means rather than a day-weighted annual average. The largest monthly increase occurred in April, with a difference of +1.81 mm/day, while May had the largest monthly decrease, at -0.60 mm/day. These figures describe daily averages, not monthly snowfall totals, and the overall mean difference does not indicate that every month changed in the same direction.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of -0.01 mm/day between the periods, an unweighted summary of monthly means rather than a day-weighted annual average. The largest monthly increase occurred in July, with a difference of +0.32 mm/day, while June recorded the largest monthly decrease, at -0.29 mm/day. These are changes in daily averages, not monthly rainfall totals, and the overall mean does not imply the same change in each month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.24 hours/day between the reference periods; this unweighted comparison of monthly means is not a day-weighted annual average. The largest monthly increase was in June, at +1.04 hours/day. In October, sunshine instead had the largest monthly decrease, with a difference of -0.89 hours/day. The mean summarizes the calendar-month averages and should not be read as a uniform change throughout the year.