Climate Change Chart of Saint John, Canada

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.01 °C in the more recent period. This describes the change in the set of monthly averages, not a continuous trend or a rise in every month, and these means do not indicate daytime maximum temperatures. The largest monthly temperature increase was in July, with a difference of +1.65 °C. It marks the strongest increase among the supplied monthly comparisons, rather than a measure of daytime heat.

Changes in rainfall

Mean daily rainfall averaged across calendar months increased by +0.49 mm/day. This aggregate difference does not mean rainfall rose in every month, and daily averages should not be read as monthly totals. The largest monthly increase was in January, at +1.14 mm/day; by contrast, October had the largest decrease, a difference of -0.07 mm/day. These monthly comparisons describe average daily amounts, not how often rain fell.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months decreased by -0.35 hours/day. The monthly pattern was not uniform: June had the largest decrease, at -1.04 hours/day, while the largest increase was in September, with a difference of +0.15 hours/day.

Changes in snowfall

Mean daily snowfall averaged across calendar months increased by +0.77 mm/day. Its largest monthly increase was in January, at +5.10 mm/day, while the largest decrease was in May, a difference of -0.81 mm/day; these daily means are not monthly snowfall totals.