Climate Change Chart of Toronto, Canada

Overview of climate changes

Temperature changes

The mean difference across calendar months was +1.06 °C, an unweighted comparison of monthly mean temperatures rather than a day-weighted annual figure; it does not imply that every month became warmer. December had the largest monthly increase, at +2.81 °C, while November recorded the largest decrease, a difference of -0.24 °C. These are monthly means, not daytime maximum temperatures.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -0.52 mm/day; this unweighted aggregate does not indicate the same change in each month. The largest monthly increase occurred in February, at +1.35 mm/day, while the largest decrease was in April, a difference of -2.03 mm/day. These are daily mean amounts, not monthly snowfall totals.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of +0.22 mm/day; this aggregate does not describe the change in every month. The largest monthly increase was in April, at +1.15 mm/day, whereas May saw the largest decrease, a difference of -0.96 mm/day. These figures compare daily mean amounts, not monthly rainfall totals.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.24 hours/day. Monthly changes varied: May had the largest increase, at +1.09 hours/day, while October had the largest decrease, a difference of -1.10 hours/day. The overall mean difference does not mean that sunshine declined in every month.