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 time of the year is December, with temperatures averaging a high of 42.3°F (5.7°C) and a low of 33.6°F (0.9°C).Humidity
The months with the highest humidity in West Lake Sammamish are January, February and December, with an average relative humidity of 85%.Rainfall
The month with the most rainfall is December, when the rain falls for 14.1 days and typically aggregates up to 1.85" (47mm) of precipitation.Snowfall
Months with snowfall in West Lake Sammamish are January through April, November and December. In West Lake Sammamish, Washington, in December, during 1.3 snowfall days, 0.35" (9mm) of snow is typically accumulated. In West Lake Sammamish, during the entire year, snow falls for 9.3 days and aggregates up to 3.27" (83mm) of snow.Daylight
With an average of 8h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:36 am and sunset at 4:19 pm. On the last day of December, in West Lake Sammamish, sunrise is at 7:56 am and sunset at 4:27 pm PST.
Sunshine
January and December, with an average of 4.2h of sunshine, are months with the least sunshine.UV index
The months with the lowest UV index in West Lake Sammamish are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.Note: The UV index of 2 in December translates into these instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
What time of the year is the coldest in West Lake Sammamish?
How cold is it in West Lake Sammamish in December?
What are the most humid months in West Lake Sammamish?
What is the average humidity in December in West Lake Sammamish?
What is the wettest month in West Lake Sammamish?
How many days does it rain in December in West Lake Sammamish?
How much does it snow in West Lake Sammamish in December?
What is the month with the shortest days in West Lake Sammamish?
What is the average length of the day in December in West Lake Sammamish?
What time are sunrise and sunset in December in West Lake Sammamish?
What is the month with the least sunshine in West Lake Sammamish?
How long on average sun shines in December in West Lake Sammamish?
What is the month with the lowest UV index in West Lake Sammamish?
How high is the UV index in December in West Lake Sammamish?
Average temperature in December
West Lake Sammamish, WA
- Average high temperature in December: 42.3°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 (42.3°F).
- Average low temperature in December: 33.6°F
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).
Average pressure in December
West Lake Sammamish, 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
West Lake Sammamish, WA
- Average wind speed in December: 4.6mph
The windiest month (with the highest average wind speed) is January (5mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in December
West Lake Sammamish, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is July (70%).
Average rainfall in December
West Lake Sammamish, WA
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is December (1.85").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in December
West Lake Sammamish, WA
- Average rainfall days in December: 14.1 days
The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (5.2 days).
Average snowfall in December
West Lake Sammamish, WA
- Average snowfall in December: 0.35"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
West Lake Sammamish, WA
- Average snowfall days in December: 1.3 days
The month with the highest number of snowfall days is February (3.2 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
West Lake Sammamish, WA
- Average daylight in December: 8h and 3min
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 30min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).
Average sunshine days in December
West Lake Sammamish, WA
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is August (24 days).
The month with the least sunshine days is November (13.5 days).
Average UV index in December
West Lake Sammamish, WA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
West Lake Sammamish, WA
- Average cloud cover in December: 57
The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
West Lake Sammamish, WA
- Average visibility in December: 5mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).
West Lake Sammamish, Washington, USA
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