December weather forecastKelso, WA
December
Weather in December
The first month of the winter, December, is also an icy month in Kelso, Washington, with an average temperature ranging between min 32.7°F (0.4°C) and max 42.3°F (5.7°C).Temperature
In Kelso, the lowest temperatures are generally noted in December, averaging a high of 42.3°F (5.7°C) and a low of 32.7°F (0.4°C).Humidity
January, February, November and December, with an average relative humidity of 88%, are the most humid months.Rainfall
In Kelso, in December, during 18.5 rainfall days, 3.58" (91mm) of precipitation is typically accumulated. In Kelso, during the entire year, the rain falls for 175.5 days and collects up to 25.83" (656mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Kelso, during December, snow falls for 0.9 days and regularly aggregates up to 0.24" (6mm) of snow. Throughout the year, there are 6.7 snowfall days, and 3.54" (90mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:34 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 4:36 pm PST.
Sunshine
January, February and December, with an average of 3.5h of sunshine, are months with the least sunshine.UV index
The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A maximum UV index of 2 in December translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Kelso, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure in December
Kelso, 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
Kelso, WA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in December
Kelso, WA
- Average humidity in December: 88%
The months with the highest relative humidity are January, February, November and December (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Kelso, WA
- Average rainfall in December: 3.58"
The wettest month (with the highest rainfall) is January (3.9").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in December
Kelso, WA
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is July (6.1 days).
Average snowfall in December
Kelso, WA
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Kelso, WA
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Kelso, 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: 3h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 30min).
Average sunshine days in December
Kelso, WA
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is July (22 days).
The month with the least sunshine days is March (8.9 days).
Average UV index in December
Kelso, WA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in December
Kelso, WA
- Average cloud cover in December: 64
The months with the most cloud cover are February and March (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in December
Kelso, WA
- Average visibility in December: 4mi
The month with the highest visibility is August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (4mi).
