Climate Change Chart of Denver, USA

Overview of climate changes

Changes in snowfall

Averaged across calendar months, mean daily snowfall has a difference of -0.69 mm/day in the more recent period. This is an unweighted comparison of monthly means, not a day-weighted annual average or a monthly snowfall total. The largest monthly decrease occurred in April, with a difference of -3.58 mm/day; the largest monthly increase was in February, at +1.08 mm/day. These daily-mean changes describe the named months and do not imply that the same difference occurred throughout the year.

Changes in rainfall

Averaged across calendar months, mean daily rainfall has a difference of -0.26 mm/day in the more recent period, an unweighted comparison of monthly means rather than a day-weighted annual average or a monthly total. The largest monthly decrease occurred in April, with a difference of -0.93 mm/day; by contrast, March had the largest monthly increase, at +0.21 mm/day. These are daily-mean differences for the named months, not rainfall totals.

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.77 °C in the more recent period; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in March, with a difference of +3.26 °C compared with the earlier reference period; this identifies the strongest increase among the reported months, not a change shared by every month.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration has a difference of -0.23 hours/day compared with the earlier reference period; this summarizes unweighted monthly means, not a day-weighted annual average. The largest monthly decrease was in January, with a difference of -0.49 hours/day, while the largest monthly increase was in June, at +0.07 hours/day. The two monthly extremes show that the overall mean difference does not describe every month.