Climate Chart of Stevens Pass, USA

Climate overview

Temperature

The monthly mean temperature is lowest in December, at -3.2 °C, and highest in August, at 18.2 °C. These are averages for each month, not daytime maximum temperatures, so they describe the general monthly backdrop rather than the range a visitor may experience during an individual day. Across the calendar-month means, the unweighted mean is 6.4 °C; it is not a day-weighted annual average.

Rain

Mean daily rainfall reaches its highest monthly level in October, at 3.40 mm/day, while the lowest is in July, at 0.34 mm/day. These are daily averages, not monthly totals, and the lower figure does not indicate how often rain occurs or guarantee dry days. The unweighted mean across the calendar-month daily rainfall averages is 1.48 mm/day, a broad reference rather than a description of rainfall on any one day.

Snow

Mean daily snowfall is highest in January, at 33.26 mm/day. This daily average does not establish how many days receive snow, snow depth or snow cover, and it cannot by itself indicate conditions for skiing. The unweighted mean across the calendar-month daily snowfall averages is 11.29 mm/day; it is not a monthly snowfall total.

Sunshine

Mean daily sunshine duration is highest in July, at 13.63 hours/day, and lowest in December, at 3.65 hours/day. These averages can help set expectations for outdoor daylight planning, but sunshine duration is not the same as day length. The unweighted mean across the monthly sunshine averages is 8.63 hours/day per day; it summarizes the calendar-month means rather than promising that amount on a particular date.