December weather forecastYelm, WA
December
Weather in December
The first month of the winter, December, is still a chilly month in Yelm, Washington, with an average temperature ranging between max 43°F (6.1°C) and min 32.9°F (0.5°C).Temperature
December, on average, is the coldest month, registering a high temperature of 43°F (6.1°C) and a low of 32.9°F (0.5°C).Humidity
The months with the highest humidity are January, February, November and December, with an average relative humidity of 87%.Rainfall
The month with the most rainfall is December, when the rain falls for 18.9 days and typically aggregates up to 5.28" (134mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Yelm, during December, snow falls for 1.1 days and regularly aggregates up to 0.2" (5mm) of snow. In Yelm, 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 7:36 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 value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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
Yelm, 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).
