December weather forecastMcKenna, WA
December
Weather in December
December, the first month of the winter in McKenna, is still a chilly month, with an average temperature varying between 43°F (6.1°C) and 32.9°F (0.5°C).Temperature
With average high temperatures of 43°F (6.1°C) and lows of 32.9°F (0.5°C), December is the coldest month.Humidity
January, February, November and December, with an average relative humidity of 87%, are the most humid months.Rainfall
The month with the most rainfall in McKenna is December, when the rain falls for 18.9 days and typically aggregates up to 5.28" (134mm) of precipitation.Snowfall
Months with snowfall in McKenna are January through April, November and December. In McKenna, Washington, in December, snow falls for 1.1 days, with typically accumulated 0.2" (5mm) of snow. In McKenna, during the entire year, snow falls for 9 days and aggregates up to 6.38" (162mm) 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 December, sunrise is at 7:35 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:31 pm PST.
Sunshine
January and December, with an average of 4h of sunshine, are months with the least sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
McKenna, WA
- Average high temperature in December: 43°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in December
McKenna, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in December
McKenna, WA
- Average wind speed in December: 4.6mph
The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in December
McKenna, WA
- Average humidity in December: 87%
The months with the highest relative humidity are January, February, November and December (87%).
The month with the lowest relative humidity is July (70%).
Average rainfall in December
McKenna, WA
- Average rainfall in December: 5.28"
The wettest month (with the highest rainfall) is December (5.28").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
McKenna, WA
- Average rainfall days in December: 18.9 days
The month with the highest number of rainy days is March (20.2 days).
The month with the least rainy days is August (5.3 days).
Average snowfall in December
McKenna, WA
- Average snowfall in December: 0.2"
The month with the highest snowfall is February (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
McKenna, WA
- Average snowfall days in December: 1.1 days
The month with the highest number of snowfall days is February (3.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
McKenna, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).
Average sunshine days in December
McKenna, WA
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is August (23.4 days).
The months with the least sunshine days are February and March (8.8 days).
Average UV index in December
McKenna, WA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
McKenna, WA
- Average cloud cover in December: 59
The months with the most cloud cover are January, February, March and December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
McKenna, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
