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
The coldest month is December, with an average high-temperature of 42.8°F (6°C) and an average low-temperature of 32.7°F (0.4°C).Humidity
The average relative humidity in December in Summit is 86%.Rainfall
December is the month with the most rainfall. Rain falls for 19.2 days and accumulates 4.92" (125mm) of precipitation.Snowfall
Months with snowfall in Summit are January through March, November and December. In December, in Summit, it is snowing for 1 days. Throughout December, 0.43" (11mm) of snow is accumulated. In Summit, during the entire year, snow falls for 7.4 days and aggregates up to 3.78" (96mm) of snow.Daylight
The month with the shortest days in Summit is December, with an average of 8h and 36min of daylight.On the first day of December in Summit, sunrise is at 7:35 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:29 pm PST.
Sunshine
December has the least sunshine of the year in Summit, with an average of 4.2h of sunshine.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Summit. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 during December translates into the following directions:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. 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 Summit?
How cold does it get in Summit in December?
What is the average humidity in December in Summit?
What is the rainiest month in Summit?
How much does it rain in Summit in December?
How much does it snow in Summit in December?
What is the month with the shortest days in Summit?
How many hours of daylight does Summit have in December?
When are sunrise and sunset in December in Summit?
What is the month with the least sunshine in Summit?
How many hours of sunshine does Summit have in December?
When is the lowest UV index in Summit?
What is the UV index intensity in December in Summit?
Average temperature in December
Summit, WA
- Average high temperature in December: 42.8°F
The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (42.8°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure in December
Summit, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in December
Summit, WA
- Average wind speed in December: 4.5mph
The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
Summit, WA
- Average humidity in December: 86%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is July (69%).
Average rainfall in December
Summit, WA
- Average rainfall in December: 4.92"
The wettest month (with the highest rainfall) is December (4.92").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Summit, WA
- Average rainfall days in December: 19.2 days
The month with the highest number of rainy days is March (21 days).
The month with the least rainy days is August (6.2 days).
Average snowfall in December
Summit, WA
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Summit, WA
- Average snowfall days in December: 1 days
The month with the highest number of snowfall days is February (2.7 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
Summit, WA
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in December
Summit, WA
- Average sunshine days in December: 10 days
The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is February (8.2 days).
Average UV index in December
Summit, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Summit, WA
- Average cloud cover in December: 56
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Summit, WA
- Average visibility in December: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (5mi).
Summit, Washington, USA
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