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
Mill Creek notes the coldest temperatures in December, with a high average of 42.6°F (5.9°C) and a low of 35.4°F (1.9°C).Humidity
The months with the highest humidity in Mill Creek are February and December, with an average relative humidity of 84%.Rainfall
December is the month with the most rainfall in Mill Creek. Rain falls for 18.1 days and accumulates 3.54" (90mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Mill Creek, during December, snow falls for 3.2 days and regularly aggregates up to 1.18" (30mm) of snow. Throughout the year, there are 16.3 snowfall days, and 10.08" (256mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 7:37 am and sunset at 4:18 pm. On the last day of December, in Mill Creek, sunrise is at 7:57 am and sunset at 4:26 pm PST.
Sunshine
The average sunshine in December in Mill Creek is 4.5h.UV index
The months with the lowest UV index in Mill Creek, Washington, are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 during December translates into the following directions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Boost your sun resistance with garments that are densely woven yet spacious. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Frequently asked questions
What are the coldest months in Mill Creek?
Is December cold in Mill Creek?
What are the most humid months in Mill Creek?
What is the average humidity in December in Mill Creek?
What is the rainiest month in Mill Creek?
How much does it rain in Mill Creek in December?
How much does it snow in Mill Creek in December?
What is the month with the shortest days in Mill Creek?
How many hours of daylight does Mill Creek have in December?
What time are sunrise and sunset in December in Mill Creek?
How many hours of sunshine does Mill Creek have in December?
What is the month with the lowest UV index in Mill Creek?
What is the UV index reading in December in Mill Creek?
Average temperature in December
Mill Creek, WA
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is August (72.7°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in December: 35.4°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.4°F).
Average pressure in December
Mill Creek, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Mill Creek, WA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in December
Mill Creek, WA
- Average humidity in December: 84%
The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Mill Creek, WA
- Average rainfall in December: 3.54"
The wettest month (with the highest rainfall) is December (3.54").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Mill Creek, WA
- Average rainfall days in December: 18.1 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.3 days).
Average snowfall in December
Mill Creek, WA
- Average snowfall in December: 1.18"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mill Creek, WA
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is February (5.2 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
Mill Creek, WA
- Average daylight in December: 8h and 3min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Mill Creek, WA
- Average sunshine days in December: 10.7 days
The month with the most sunshine days is August (22.6 days).
The month with the least sunshine days is November (9.1 days).
Average UV index in December
Mill Creek, 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, November and December (UV index 2).
Average cloud cover in December
Mill Creek, WA
- Average cloud cover in December: 54
The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Mill Creek, 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).
Mill Creek, Washington, USA
Weather forecast for your location
2. Allow the app to use your location
