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
December, known for its average high temperature of 36.1°F (2.3°C) and an average low temperature of 25.3°F (-3.7°C), is the coldest month.Humidity
In Sunnyside, the average relative humidity in December is 81%.Rainfall
In December, in Sunnyside, the rain falls for 10.4 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. In Sunnyside, during the entire year, the rain falls for 104.5 days and collects up to 8.23" (209mm) of precipitation.Snowfall
January through March, September, November and December are months with snowfall. December is the month with the most snowfall in Sunnyside. Snow falls for 5 days and accumulates 2.24" (57mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:23 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:43 am and sunset at 4:23 pm PST.
Sunshine
In December, the average sunshine in Sunnyside is 5.1h.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 minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. It's recommended to limit sun exposure when its radiation is at its peak during midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
What time of the year is the coldest in Sunnyside?
How cold is December in Sunnyside?
What is the average humidity in December in Sunnyside?
How much does it rain in Sunnyside in December?
When does it snow the most in Sunnyside?
How many days does it snow in December in Sunnyside?
What is the month with the shortest days in Sunnyside?
How many hours of daylight does Sunnyside have in December?
What time are sunrise and sunset in December in Sunnyside?
How many hours of sunshine does Sunnyside have in December?
When is the lowest UV index in Sunnyside?
What is the UV index reading in December in Sunnyside?
Average temperature in December
Sunnyside, WA
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (36.1°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (25.3°F).
Average pressure in December
Sunnyside, WA
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in December
Sunnyside, WA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5mph).
Average humidity in December
Sunnyside, WA
- Average humidity in December: 81%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (38%).
Average rainfall in December
Sunnyside, WA
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Sunnyside, WA
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (4.1 days).
Average snowfall in December
Sunnyside, WA
- Average snowfall in December: 2.24"
The month with the highest snowfall is December (2.24").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Sunnyside, WA
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is December (5 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Sunnyside, 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 1min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in December
Sunnyside, WA
- Average sunshine days in December: 16.2 days
The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is March (15.4 days).
Average UV index in December
Sunnyside, WA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (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, WA
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in December
Sunnyside, WA
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Sunnyside, Washington, USA
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