Climate Change Chart of Montpelier, USA

Overview of climate changes

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +1.04 °C. This is an unweighted comparison of monthly means, not a day-weighted annual average, and monthly mean temperature should not be read as a daytime maximum. The largest monthly increase was in December, with a difference of +3.26 °C. By contrast, November had the largest monthly decrease, a difference of -0.41 °C.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -0.50 mm/day. This is an unweighted comparison of monthly means, not a day-weighted annual average, and snowfall is expressed as a daily mean rather than a monthly total. The largest monthly increase in mean daily snowfall was in December, with a difference of +0.93 mm/day. The largest monthly decrease was in January, with a difference of -1.80 mm/day; these differences describe the monthly averages, not snowfall on every individual day.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -0.09 mm/day. This summarizes the monthly means rather than a day-weighted annual average, and the measure is a daily mean, not a monthly rainfall total. The largest monthly increase in mean daily rainfall was in October, with a difference of +0.80 mm/day. The largest monthly decrease occurred in May, at a difference of -0.83 mm/day; these monthly contrasts need not describe every day in either period.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.14 hours/day. This is an unweighted comparison of monthly means, while the measure itself is average sunshine hours per day. The largest monthly increase in mean daily sunshine was in May, with a difference of +0.99 hours/day. In October, the largest monthly decrease was a difference of -1.19 hours/day.