December weather forecastSouth Cle Elum, WA
December
Weather in December
December, the first month of the winter in South Cle Elum, is also a subzero cold month, with an average temperature fluctuating between 18.3°F (-7.6°C) and 29.7°F (-1.3°C).Temperature
Temperature records mark December as the coldest month, with highs averaging 29.7°F (-1.3°C) and lows at 18.3°F (-7.6°C).Humidity
In December, the average relative humidity is 91%.Rainfall
In South Cle Elum, during December, the rain falls for 12.1 days and regularly aggregates up to 4.17" (106mm) of precipitation. In South Cle Elum, during the entire year, the rain falls for 161.2 days and collects up to 28.46" (723mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In South Cle Elum, in December, during 15.1 snowfall days, 15.24" (387mm) of snow is typically accumulated. In South Cle Elum, during the entire year, snow falls for 69.9 days and aggregates up to 60.24" (1530mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:30 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:50 am and sunset at 4:24 pm PST.
Sunshine
In South Cle Elum, the average sunshine in December is 3.7h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 1 in December leads to these recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Cle Elum, WA
- Average high temperature in December: 29.7°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in December: 18.3°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (18.3°F).
Average pressure in December
South Cle Elum, WA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed in December
South Cle Elum, WA
- Average wind speed in December: 4.2mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in December
South Cle Elum, WA
- Average humidity in December: 91%
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall in December
South Cle Elum, WA
- Average rainfall in December: 4.17"
The wettest month (with the highest rainfall) is January (4.41").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
South Cle Elum, WA
- Average rainfall days in December: 12.1 days
The months with the highest number of rainy days are March and April (18.3 days).
The month with the least rainy days is August (5.5 days).
Average snowfall in December
South Cle Elum, WA
- Average snowfall in December: 15.24"
The month with the highest snowfall is January (16.3").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
South Cle Elum, WA
- Average snowfall days in December: 15.1 days
The month with the highest number of snowfall days is December (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
South Cle Elum, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 3h and 42min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
South Cle Elum, WA
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in December
South Cle Elum, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
South Cle Elum, WA
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in December
South Cle Elum, WA
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (3mi).
