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 period is December, when temperatures fluctuate between an average high of 44.2°F (6.8°C) and a low of 36.5°F (2.5°C).Humidity
The months with the highest humidity are November and December, with an average relative humidity of 88%.Rainfall
In Cosmopolis, during December, the rain falls for 12.7 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, in Cosmopolis, Washington, there are 113.5 rainfall days, and 10.24" (260mm) of precipitation is accumulated.Snowfall
April through December are months without snowfall.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year in Cosmopolis.On the first day of December, sunrise is at 7:40 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 4:36 pm PST.
Sunshine
The average sunshine in December in Cosmopolis, Washington, is 3.6h.UV index
The months with the lowest UV index in Cosmopolis 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 hazard from unsafe exposure to UV radiation for the average person.Note: In December, the UV index of 2 transforms into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Enhance your sun protection with tightly woven, yet airy clothing. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Frequently asked questions
What time of the year is the coldest in Cosmopolis?
How cold does it get in Cosmopolis in December?
What are the most humid months in Cosmopolis?
What is the average humidity in December in Cosmopolis?
How many days does it rain in December in Cosmopolis?
When it does not snow in Cosmopolis?
Does it snow in Cosmopolis in December?
What is the month with the shortest days in Cosmopolis?
How many hours of daylight does Cosmopolis have in December?
When are sunrise and sunset in December in Cosmopolis?
How many hours of sunshine does Cosmopolis have in December?
When is the lowest UV index in Cosmopolis?
What is the UV index intensity in December in Cosmopolis?
Average temperature in December
Cosmopolis, WA
- Average high temperature in December: 44.2°F
The warmest month (with the highest average high temperature) is August (71.4°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in December: 36.5°F
The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is December (36.5°F).
Average pressure in December
Cosmopolis, WA
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is July (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in December
Cosmopolis, WA
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is January (7mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).
Average humidity in December
Cosmopolis, WA
- Average humidity in December: 88%
The months with the highest relative humidity are November and December (88%).
The month with the lowest relative humidity is July (78%).
Average rainfall in December
Cosmopolis, WA
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is January (1.93").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in December
Cosmopolis, WA
- Average rainfall days in December: 12.7 days
The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (3.2 days).
Average snowfall in December
Cosmopolis, WA
- Average snowfall in December: 0"
The months with the highest snowfall are January and February (0.28").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Cosmopolis, WA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Cosmopolis, 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: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Cosmopolis, WA
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is August (25.4 days).
The months with the least sunshine days are February and March (14.1 days).
Average UV index in December
Cosmopolis, 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
Cosmopolis, WA
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Cosmopolis, WA
- Average visibility in December: 4mi
The months with the highest visibility are February, March, April, May, June and November (5mi).
The months with the lowest visibility are January, July, August, September, October and December (4mi).
Cosmopolis, Washington, USA
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