December weather forecastAriel, WA
December
Weather in December
The first month of the winter, December, is still a cold month in Ariel, Washington, with an average temperature ranging between max 40.6°F (4.8°C) and min 30.7°F (-0.7°C).Temperature
Ariel experiences its lowest temperatures in December, with an average peak of 40.6°F (4.8°C) and a low of 30.7°F (-0.7°C).Humidity
The average relative humidity in December in Ariel is 86%.Rainfall
In Ariel, Washington, in December, it is raining for 19.5 days, with typically 6.97" (177mm) of accumulated precipitation. Throughout the year, there are 182.3 rainfall days, and 48.11" (1222mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, November and December. In December, in Ariel, it is snowing for 2 days. Throughout December, 1.14" (29mm) of snow is accumulated. In Ariel, during the entire year, snow falls for 11.4 days and aggregates up to 11.1" (282mm) of snow.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 7:32 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:51 am and sunset at 4:35 pm PST.
Sunshine
In Ariel, the average sunshine in December is 3.3h.UV index
In Ariel, Washington, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Ariel, WA
- Average high temperature in December: 40.6°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (40.6°F).
- Average low temperature in December: 30.7°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (30.7°F).
Average pressure in December
Ariel, 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
Ariel, WA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is January (6.1mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in December
Ariel, WA
- Average humidity in December: 86%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are July and August (69%).
Average rainfall in December
Ariel, WA
- Average rainfall in December: 6.97"
The wettest month (with the highest rainfall) is January (7.64").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Ariel, WA
- Average rainfall days in December: 19.5 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (5.6 days).
Average snowfall in December
Ariel, WA
- Average snowfall in December: 1.14"
The month with the highest snowfall is February (4.02").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Ariel, WA
- Average snowfall days in December: 2 days
The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Ariel, 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 18min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 12min).
Average sunshine days in December
Ariel, WA
- Average sunshine days in December: 9.2 days
The month with the most sunshine days is August (23.4 days).
The month with the least sunshine days is February (8.1 days).
Average UV index in December
Ariel, 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
Ariel, WA
- Average cloud cover in December: 66
The months with the most cloud cover are February and December (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Ariel, WA
- Average visibility in December: 4mi
The months with the highest visibility are June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, November and December (4mi).
