December weather forecastPullman, WA
December
Weather in December
The biting winter takes center stage in December, Pullman's coldest month. Snowfalls become a common phenomenon, contributing to high humidity levels. The year ends on shorter hours of sunlight, calling for long, dark nights. Winds retain the same speed as that in November, while rainfall takes a backseat. With the mercury dipping to 24.1°F (-4.4°C), December records the lowest temperature for the year in Pullman.Temperature
December, on average, is the coldest month in Pullman, Washington, registering a high temperature of 34.3°F (1.3°C) and a low of 24.1°F (-4.4°C).Humidity
In Pullman, the average relative humidity in December is 85%.Rainfall
In Pullman, Washington, in December, during 10.5 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. In Pullman, during the entire year, the rain falls for 131 days and collects up to 18.15" (461mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In December, it is snowing for 12.9 days. Throughout December, 7.8" (198mm) of snow is accumulated. Throughout the year, there are 53.7 snowfall days, and 37.44" (951mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 36min of daylight.On the first day of December in Pullman, sunrise is at 7:13 am and sunset at 4:02 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:10 pm PST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 4.7h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Pullman. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In December, an average UV index of 2 transforms into the following instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Pullman, WA
- Average high temperature in December: 34.3°F
The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (34.3°F).
- Average low temperature in December: 24.1°F
The month with the highest average low temperature is August (58.6°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).
Average pressure in December
Pullman, WA
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Pullman, WA
- Average wind speed in December: 6mph
The windiest months (with the highest average wind speed) are March and April (6.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Pullman, WA
- Average humidity in December: 85%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (39%).
Average rainfall in December
Pullman, WA
- Average rainfall in December: 2.17"
The wettest month (with the highest rainfall) is January (2.2").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in December
Pullman, WA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is March (15.4 days).
The months with the least rainy days are July and August (5.8 days).
Average snowfall in December
Pullman, WA
- Average snowfall in December: 7.8"
The month with the highest snowfall is February (10.04").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Pullman, WA
- Average snowfall days in December: 12.9 days
The month with the highest number of snowfall days is December (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Pullman, 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 42min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 42min).
Average sunshine days in December
Pullman, WA
- Average sunshine days in December: 13.6 days
The month with the most sunshine days is July (23.4 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in December
Pullman, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Pullman, WA
- Average cloud cover in December: 51
The months with the most cloud cover are January and February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in December
Pullman, WA
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
