December weather forecastRoosevelt, WA
December
Weather in December
December, the first month of the winter in Roosevelt, is still a cold month, with an average temperature ranging between max 36.5°F (2.5°C) and min 26.6°F (-3°C).Temperature
December, with an average high of 36.5°F (2.5°C) and a low of 26.6°F (-3°C), signifies the coldest month of the year.Humidity
In Roosevelt, the average relative humidity in December is 82%.Rainfall
In December, the rain falls for 11 days. Throughout December, 0.94" (24mm) of precipitation is accumulated. In Roosevelt, during the entire year, the rain falls for 107.9 days and collects up to 8.46" (215mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 4.8 days. Throughout December, 2.2" (56mm) of snow is accumulated. Throughout the year, there are 15.8 snowfall days, and 9.69" (246mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:22 am and sunset at 4:18 pm. On the last day of December, sunrise is at 7:41 am and sunset at 4:26 pm PST.
Sunshine
The average sunshine in December is 5.4h.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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Roosevelt, WA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in December: 26.6°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (26.6°F).
Average pressure in December
Roosevelt, WA
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in December
Roosevelt, WA
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is June (9.2mph).
The calmest month (with the lowest average wind speed) is January (6.3mph).
Average humidity in December
Roosevelt, WA
- Average humidity in December: 82%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in December
Roosevelt, WA
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is January (1.1").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Roosevelt, WA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is July (4.4 days).
Average snowfall in December
Roosevelt, WA
- Average snowfall in December: 2.2"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Roosevelt, WA
- Average snowfall days in December: 4.8 days
The month with the highest number of snowfall days is December (4.8 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Roosevelt, WA
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 24min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in December
Roosevelt, WA
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is July (25 days).
The month with the least sunshine days is February (14 days).
Average UV index in December
Roosevelt, WA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Roosevelt, WA
- Average cloud cover in December: 46
The month with the most cloud cover is January (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Roosevelt, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
