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 temperatures occur during December, when averages reach a peak of 39.7°F (4.3°C) and a low of 29.8°F (-1.2°C).Humidity
In Preston, Washington, the average relative humidity in December is 86%.Rainfall
In Preston, Washington, during December, the rain falls for 18.5 days and regularly aggregates up to 6.06" (154mm) of precipitation. Throughout the year, there are 184.9 rainfall days, and 39.96" (1015mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Preston, in December, during 3.7 snowfall days, 1.61" (41mm) of snow is typically accumulated. Throughout the year, there are 17.4 snowfall days, and 11.38" (289mm) of snow is accumulated.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 7:35 am and sunset at 4:18 pm. On the last day of December, sunrise is at 7:55 am and sunset at 4:26 pm PST.
Sunshine
January and December, with an average of 3.9h of sunshine, are months with the least sunshine.UV index
In Preston, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days in Preston?
How many hours of daylight does Preston have in December?
When are sunrise and sunset in December?
What are the months with the least sunshine?
How long on average sun shines in December?
What is the UV index intensity in December?
Average temperature in December
Preston, WA
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is August (74.8°F).
The month with the lowest average high temperature is December (39.7°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is August (48.7°F).
The coldest month (with the lowest average low temperature) is December (29.8°F).
Average pressure in December
Preston, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in December
Preston, WA
- Average wind speed in December: 4.6mph
The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).
Average humidity in December
Preston, WA
- Average humidity in December: 86%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (71%).
Average rainfall in December
Preston, WA
- Average rainfall in December: 6.06"
The wettest month (with the highest rainfall) is January (6.1").
The driest months (with the least rainfall) are July and August (0.59").
Average rainfall days in December
Preston, WA
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (6.4 days).
Average snowfall in December
Preston, WA
- Average snowfall in December: 1.61"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Preston, WA
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is February (5.4 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
Preston, 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: 3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 3h and 54min).
Average sunshine days in December
Preston, WA
- Average sunshine days in December: 10 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is February (7.8 days).
Average UV index in December
Preston, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Preston, WA
- Average cloud cover in December: 59
The months with the most cloud cover are January, February, March and December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Preston, WA
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Preston, Washington, USA
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