Climate Chart of Cheyenne, USA

Climate overview

Temperature

The monthly mean temperature is lowest in February, at -2.6 °C, and highest in July, at 21.8 °C. These are monthly averages, not daytime highs or lows, so they are useful for understanding the broad temperature contrast across the year but do not describe the full range visitors may encounter within a day. Across the calendar-month means, the unweighted mean temperature is 8.3 °C. It is a summary of monthly averages rather than a day-weighted annual average, and it should not be read as a temperature expected on every visit.

Rain

Mean daily rainfall reaches its highest monthly average in May, at 2.47 mm/day. This is a daily mean, not a monthly accumulation, and it does not indicate how often rain falls or guarantee wet weather on any particular day. The lowest mean daily rainfall is shared by January / December, at 0.02 mm/day. Across the monthly means, the unweighted average is 0.76 mm/day per day; neither figure describes rain frequency, so even the lower-average months do not promise dry conditions.

Sunshine

Mean daily sunshine duration is highest in June, at 12.86 hours/day, and lowest in December, at 7.06 hours/day. These figures can help with broad outdoor-planning expectations, but sunshine duration is not day length and does not guarantee clear skies throughout a visit. The unweighted mean across the monthly sunshine averages is 9.79 hours/day per day. It is a summary of monthly means, not a promise about the sunshine available on an individual day.

Snow

Mean daily snowfall is highest in April, at 8.37 mm/day. The unweighted mean across monthly snowfall averages is 3.56 mm/day per day. These snowfall means do not establish the number of snowy days, snow depth or snow cover, and cannot determine skiing conditions.