Climate Change Chart of Haida Gwaii, Canada

Overview of climate changes

Temperature changes

Monthly mean temperature shows an average difference of +0.87 °C across calendar months in the more recent period. This is an unweighted mean of monthly averages, not a day-weighted annual figure, and it does not mean that every month had the same change. The largest monthly increase was in January, with a difference of +2.13 °C; these are monthly mean temperatures, not daytime highs.

Changes in rainfall

Mean daily rainfall had an average difference of +2.03 mm/day across calendar months compared with the earlier reference period. This unweighted comparison of monthly means is not a monthly rainfall total, and it does not imply the same difference in every month. The largest monthly increase occurred in August, at a difference of +3.59 mm/day in mean daily rainfall.

Changes in snowfall

Mean daily snowfall had an average difference of +1.47 mm/day across calendar months compared with the earlier reference period. This unweighted mean summarizes monthly averages; it is not a monthly snowfall total and does not describe the difference in every month. The largest monthly increase was in January, with a difference of +4.17 mm/day in mean daily snowfall.

Changes in sunshine duration

Mean daily sunshine duration had an average difference of -0.72 hours/day across calendar months in the more recent period. This is an unweighted mean of monthly averages, rather than a day-weighted annual measure, so it summarizes the comparison without implying an equal change in every month. The largest monthly decrease was in May, with a difference of -1.46 hours/day in mean daily sunshine.