December weather forecastWalnut Grove, WA
December
Weather in December
December, the first month of the winter in Walnut Grove, is still a chilly month, with an average temperature ranging between max 43.7°F (6.5°C) and min 34°F (1.1°C).Temperature
December is the month when Walnut Grove sees the lowest average temperatures, with a high of 43.7°F (6.5°C) and a low of 34°F (1.1°C).Humidity
In Walnut Grove, the average relative humidity in December is 83%.Rainfall
The month with the most rainfall is December, when the rain falls for 19.6 days and typically aggregates up to 5.08" (129mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Walnut Grove. In Walnut Grove, during December, snow falls for 0.6 days and regularly aggregates up to 0.35" (9mm) of snow. Throughout the year, there are 5.9 snowfall days, and 3.74" (95mm) of snow is accumulated.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Walnut Grove, Washington.On the first day of December, sunrise is at 7:31 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:36 pm PST.
Sunshine
In Walnut Grove, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Walnut Grove, WA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in December: 34°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34°F).
Average pressure in December
Walnut Grove, WA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in December
Walnut Grove, WA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is January (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in December
Walnut Grove, WA
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (65%).
Average rainfall in December
Walnut Grove, WA
- Average rainfall in December: 5.08"
The wettest month (with the highest rainfall) is December (5.08").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Walnut Grove, WA
- Average rainfall days in December: 19.6 days
The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.9 days).
Average snowfall in December
Walnut Grove, WA
- Average snowfall in December: 0.35"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Walnut Grove, WA
- Average snowfall days in December: 0.6 days
The month with the highest number of snowfall days is February (2.1 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
Walnut Grove, WA
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 4h and 12min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The months with the least sunshine are January and February (Average sunshine: 4h and 6min).
Average sunshine days in December
Walnut Grove, WA
- Average sunshine days in December: 9.9 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (7.9 days).
Average UV index in December
Walnut Grove, WA
- Average UV index in December: 2
The month with the highest UV index is 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
Walnut Grove, WA
- Average cloud cover in December: 56
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in December
Walnut Grove, WA
- Average visibility in December: 5mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).
