December weather forecastMill Creek, CA
December
Weather in December
The first month of the winter, December, is also a wintry month in Mill Creek, California, with an average temperature ranging between min 24.1°F (-4.4°C) and max 38.3°F (3.5°C).Temperature
In Mill Creek, the lowest average temperatures are observed in December, with a high of 38.3°F (3.5°C) and a low of 24.1°F (-4.4°C).Humidity
In Mill Creek, the average relative humidity in December is 79%.Rainfall
In Mill Creek, during December, the rain falls for 8.9 days and regularly aggregates up to 5.2" (132mm) of precipitation. Throughout the year, there are 98.1 rainfall days, and 32.99" (838mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In Mill Creek, in December, snow falls for 12.2 days, with typically accumulated 25.67" (652mm) of snow. In Mill Creek, during the entire year, snow falls for 66 days and aggregates up to 127.72" (3244mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:10 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:50 pm PST.
Sunshine
In Mill Creek, the average sunshine in December is 5.2h.UV index
In Mill Creek, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. 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
Average temperature in December
Mill Creek, CA
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in December: 24.1°F
The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).
Average pressure in December
Mill Creek, CA
- Average pressure in December: 30.16"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Mill Creek, CA
- Average wind speed in December: 6mph
The windiest month (with the highest average wind speed) is March (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Mill Creek, CA
- Average humidity in December: 79%
The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is July (42%).
Average rainfall in December
Mill Creek, CA
- Average rainfall in December: 5.2"
The wettest month (with the highest rainfall) is March (5.59").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
Mill Creek, CA
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is August (4 days).
Average snowfall in December
Mill Creek, CA
- Average snowfall in December: 25.67"
The month with the highest snowfall is March (27.05").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Mill Creek, CA
- Average snowfall days in December: 12.2 days
The month with the highest number of snowfall days is March (14 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Mill Creek, CA
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 12min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Mill Creek, CA
- Average sunshine days in December: 14.6 days
The month with the most sunshine days is August (25 days).
The month with the least sunshine days is March (10.9 days).
Average UV index in December
Mill Creek, CA
- 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 February and November (UV index 1).
Average cloud cover in December
Mill Creek, CA
- Average cloud cover in December: 44
The month with the most cloud cover is March (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 7).
Average visibility in December
Mill Creek, CA
- Average visibility in December: 5mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
