Climate Change Chart of Sun Valley, USA

Overview of climate changes

Temperature changes

The mean difference across calendar months was +1.91 °C, an unweighted comparison of monthly mean temperatures rather than a day-weighted annual average. It describes the overall difference between the reference periods, not a continuous change or a shift shared by every month. The largest monthly increase was in January, with a difference of +5.16 °C; this refers to monthly mean temperature, not daytime highs.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of +0.22 mm/day between the periods, using an unweighted mean of monthly means rather than a day-weighted annual average. Monthly changes varied: the largest increase was in January, at +2.59 mm/day, while the largest decrease was in March, with a difference of -1.32 mm/day. These are daily-average amounts, not monthly snowfall totals, and the across-month mean does not describe every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.27 mm/day between the reference periods. This is an unweighted mean of monthly means, not a day-weighted annual average, and it does not imply the same difference in every month. The largest monthly increase was in February, at +0.76 mm/day. By contrast, the largest monthly decrease was in June, with a difference of -0.16 mm/day. These figures describe mean daily rainfall, not monthly rainfall totals.

Changes in sunshine duration

The unweighted mean difference in daily sunshine duration across calendar months was -0.02 hours/day; this summarizes the monthly means and is not a day-weighted annual average or a description of every month. The largest monthly increase occurred in February, with a difference of +0.30 hours/day. The largest monthly decrease was shared by March / May / August, each with a difference of -0.18 hours/day. These comparisons concern average daily sunshine hours in the reference periods, not a continuous trend.