December weather forecastHillside Siding, WA
December
Weather in December
The first month of the winter, December, is also an icy month in Hillside Siding, Washington, with an average temperature ranging between max 36°F (2.2°C) and min 23.9°F (-4.5°C).Temperature
Hillside Siding experiences its lowest average temperatures in December, reaching a peak of 36°F (2.2°C) and a minimum of 23.9°F (-4.5°C).Humidity
In December, the average relative humidity is 82%.Rainfall
The month with the most rainfall is December, when the rain falls for 9.2 days and typically aggregates up to 0.87" (22mm) of precipitation.Snowfall
Months with snowfall are January through April, September, November and December. December is the month with the most snowfall. Snow falls for 5.7 days and accumulates 3.07" (78mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:26 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:46 am and sunset at 4:23 pm PST.
Sunshine
The average sunshine in December is 5.8h.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 value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In December, the UV index of 2 transforms into the following advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. 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
Hillside Siding, WA
- Average high temperature in December: 36°F
The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (36°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure in December
Hillside Siding, WA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in December
Hillside Siding, WA
- Average wind speed in December: 4.2mph
The windiest month (with the highest average wind speed) is June (7.4mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in December
Hillside Siding, 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 (41%).
Average rainfall in December
Hillside Siding, WA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in December
Hillside Siding, WA
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is July (2.3 days).
Average snowfall in December
Hillside Siding, WA
- Average snowfall in December: 3.07"
The month with the highest snowfall is December (3.07").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in December
Hillside Siding, WA
- Average snowfall days in December: 5.7 days
The month with the highest number of snowfall days is December (5.7 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Hillside Siding, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 5h and 48min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in December
Hillside Siding, WA
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is July (27.6 days).
The month with the least sunshine days is February (15.5 days).
Average UV index in December
Hillside Siding, 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
Hillside Siding, WA
- Average cloud cover in December: 38
The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in December
Hillside Siding, 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).
