Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
During the coldest month in Walla, December, temperatures average a high of 37.4°F (3°C) and a low of 27°F (-2.8°C).Humidity
The average relative humidity in December is 79%.Rainfall
In Walla, during December, the rain falls for 13.9 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, in Walla, there are 141.7 rainfall days, and 15.12" (384mm) of precipitation is accumulated.Snowfall
Months with snowfall in Walla are January through April, September, November and December. In Walla, in December, during 6.1 snowfall days, 2.28" (58mm) of snow is typically accumulated. Throughout the year, there are 21.1 snowfall days, and 9.09" (231mm) of snow is accumulated.Daylight
The month with the shortest days in Walla is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:15 am and sunset at 4:09 pm. On the last day of December, sunrise is at 7:35 am and sunset at 4:18 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 rays for average individuals.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Walla?
How cold is it in Walla in December?
What is the average humidity in December in Walla?
How many days does it rain in December in Walla?
How many days does it snow in December in Walla?
What is the month with the shortest days in Walla?
How many hours of daylight does Walla have in December?
When is the sunrise / sunset in December in Walla?
How long on average sun shines in December in Walla?
When is the lowest UV index in Walla?
What is the UV index reading in December in Walla?
Average temperature in December
Walla Walla, WA
- Average high temperature in December: 37.4°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (37.4°F).
- Average low temperature in December: 27°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure in December
Walla Walla, 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 (29.9"Hg).
Average wind speed in December
Walla Walla, WA
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).
Average humidity in December
Walla Walla, WA
- Average humidity in December: 79%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).
Average rainfall in December
Walla Walla, WA
- Average rainfall in December: 1.93"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Walla Walla, WA
- Average rainfall days in December: 13.9 days
The month with the highest number of rainy days is March (17.4 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in December
Walla Walla, WA
- Average snowfall in December: 2.28"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in December
Walla Walla, WA
- Average snowfall days in December: 6.1 days
The months with the highest number of snowfall days are February and December (6.1 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Walla Walla, WA
- Average daylight in December: 8h and 4min
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 2min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in December
Walla Walla, WA
- Average sunshine days in December: 13.1 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is February (10 days).
Average UV index in December
Walla Walla, 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, November and December (UV index 2).
Average cloud cover in December
Walla Walla, WA
- Average cloud cover in December: 44
The months with the most cloud cover are January, February and December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in December
Walla Walla, WA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Walla Walla, Washington, USA
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