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 month of December, characterized by an average high of 34.7°F (1.5°C) and a low of 24.6°F (-4.1°C), is recognized as the coldest.Humidity
The average relative humidity in December in Thornton is 84%.Rainfall
December is the month with the most rainfall. Rain falls for 9.5 days and accumulates 1.93" (49mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Thornton, in December, during 9.6 snowfall days, 4.65" (118mm) of snow is typically accumulated. Throughout the year, there are 39.6 snowfall days, and 22.68" (576mm) of snow is accumulated.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year in Thornton, Washington.On the first day of December, sunrise is at 7:15 am and sunset at 4:01 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:10 pm PST.
Sunshine
January and December, with an average of 4.6h of sunshine, are months with the least sunshine in Thornton.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Thornton. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the coldest time of year in Thornton?
How cold is December in Thornton?
What is the average humidity in December in Thornton?
What is the wettest month in Thornton?
How much does it rain in Thornton in December?
How much does it snow in Thornton in December?
What is the month with the shortest days in Thornton?
How many hours of daylight does Thornton have in December?
What time are sunrise and sunset in December in Thornton?
What is the month with the least sunshine in Thornton?
How long on average sun shines in December in Thornton?
What are the months with the lowest UV index in Thornton?
How high is the UV index in December in Thornton?
Average temperature in December
Thornton, WA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (34.7°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.6°F).
Average pressure in December
Thornton, WA
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Thornton, WA
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in December
Thornton, WA
- Average humidity in December: 84%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (37%).
Average rainfall in December
Thornton, WA
- Average rainfall in December: 1.93"
The wettest month (with the highest rainfall) is December (1.93").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in December
Thornton, WA
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is April (14.6 days).
The month with the least rainy days is July (4.5 days).
Average snowfall in December
Thornton, WA
- Average snowfall in December: 4.65"
The month with the highest snowfall is February (6.69").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Thornton, WA
- Average snowfall days in December: 9.6 days
The months with the highest number of snowfall days are February and December (9.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Thornton, WA
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 4h and 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in December
Thornton, WA
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is February (12.2 days).
Average UV index in December
Thornton, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Thornton, WA
- Average cloud cover in December: 53
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in December
Thornton, WA
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Thornton, Washington, USA
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