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
In Sunnyside, December is the coldest month, with temperatures averaging a high of 44.4°F (6.9°C) and a low of 34.3°F (1.3°C).Humidity
The average relative humidity in December in Sunnyside is 83%.Rainfall
December is the month with the most rainfall. Rain falls for 19.2 days and accumulates 5.16" (131mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Sunnyside. In Sunnyside, during December, snow falls for 0.9 days and regularly aggregates up to 0.51" (13mm) of snow. Throughout the year, there are 6.1 snowfall days, and 4.17" (106mm) of snow is accumulated.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:30 am and sunset at 4:28 pm. On the last day of December, in Sunnyside, sunrise is at 7:49 am and sunset at 4:37 pm PST.
Sunshine
In Sunnyside, the average sunshine in December is 4.4h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sunnyside. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 2 during December translates into the following guidance:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the coldest time of year in Sunnyside?
How cold does it get in Sunnyside in December?
What is the average humidity in December in Sunnyside?
What is the rainiest month in Sunnyside?
How much does it rain in Sunnyside in December?
How many days does it snow in December in Sunnyside?
What is the month with the shortest days in Sunnyside?
What is the average length of the day in December in Sunnyside?
When are sunrise and sunset in December in Sunnyside?
How many hours of sunshine does Sunnyside have in December?
What is the month with the lowest UV index in Sunnyside?
What is the UV index intensity in December in Sunnyside?
Average temperature in December
Sunnyside, OR
- Average high temperature in December: 44.4°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (44.4°F).
- Average low temperature in December: 34.3°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in December
Sunnyside, OR
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in December
Sunnyside, OR
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
Sunnyside, OR
- Average humidity in December: 83%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).
Average rainfall in December
Sunnyside, OR
- Average rainfall in December: 5.16"
The wettest month (with the highest rainfall) is December (5.16").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Sunnyside, OR
- Average rainfall days in December: 19.2 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (4 days).
Average snowfall in December
Sunnyside, OR
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Sunnyside, OR
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is February (2.3 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
Sunnyside, OR
- Average daylight in December: 8h and 5min
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 2min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Sunnyside, OR
- Average sunshine days in December: 10.5 days
The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is February (8.1 days).
Average UV index in December
Sunnyside, OR
- 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
Sunnyside, OR
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in December
Sunnyside, OR
- Average visibility in December: 5mi
The months with the highest visibility are July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, November and December (5mi).
Sunnyside, Oregon, USA
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