Climate Change Chart of Cheyenne, USA

Overview of climate changes

Temperature changes

Monthly mean temperature was higher by a mean difference of +1.93 °C averaged across calendar months 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 occurred in March, with a difference of +3.76 °C compared with the earlier reference period. This identifies the strongest increase among the supplied monthly differences, rather than implying that every month's mean rose by the same amount.

Changes in snowfall

Mean daily snowfall, averaged across calendar months, had a difference of +0.44 mm/day in the more recent period. This unweighted comparison summarizes monthly means and refers to daily amounts, not monthly snowfall totals. The largest monthly increase was in December, with a difference of +1.81 mm/day compared with the earlier reference period. In April, the largest monthly decrease had a difference of -1.71 mm/day; these month-specific differences underline that the overall mean does not describe every month's change.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -0.20 mm/day in the more recent period. This unweighted mean of monthly differences describes an aggregate, not a change shared by every month; the values refer to daily means rather than monthly rainfall totals. The largest monthly decrease was in June, with a difference of -1.21 mm/day compared with the earlier reference period. By contrast, May had the largest monthly increase, a difference of +0.20 mm/day; these month-specific differences show that rainfall changes were not uniform across the calendar.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.13 hours/day in the more recent period. This is an unweighted summary of monthly means, not evidence that sunshine duration decreased in every month. The largest monthly increase occurred in June, with a difference of +0.62 hours/day compared with the earlier reference period. The largest decrease was shared by January / February / May, each with a difference of -0.40 hours/day, indicating that the monthly pattern included both increases and decreases.