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
With its high average temperature of 33.1°F (0.6°C) and a low of 23.9°F (-4.5°C), December is regarded as the coldest month.Humidity
In December, the average relative humidity in Rosalia is 85%.Rainfall
In Rosalia, in December, during 6.5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Rosalia, there are 84.3 rainfall days, and 7.24" (184mm) of precipitation is accumulated.Snowfall
January through May, September, November and December are months with snowfall. In December, in Rosalia, it is snowing for 9.3 days. Throughout December, 2.91" (74mm) of snow is accumulated. Throughout the year, in Rosalia, there are 32.5 snowfall days, and 14.09" (358mm) of snow is accumulated.Daylight
The month with the shortest days in Rosalia is December, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:16 am and sunset at 4:01 pm. On the last day of December, in Rosalia, sunrise is at 7:36 am and sunset at 4:09 pm PST.
Sunshine
With an average of 4.3h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rosalia, Washington. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In December, the UV index of 2 transforms into the following advice:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Frequently asked questions
What are the coldest months in Rosalia?
How cold is December in Rosalia?
What is the average humidity in December in Rosalia?
How many days does it rain in December in Rosalia?
How much does it snow in Rosalia in December?
What is the month with the shortest days in Rosalia?
How many hours of daylight does Rosalia have in December?
What time are sunrise and sunset in December in Rosalia?
What is the month with the least sunshine in Rosalia?
How many hours of sunshine does Rosalia have in December?
What is the month with the lowest UV index in Rosalia?
What is the UV index reading in December in Rosalia?
Average temperature in December
Rosalia, WA
- Average high temperature in December: 33.1°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (33.1°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure in December
Rosalia, 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 (29.9"Hg).
Average wind speed in December
Rosalia, WA
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Rosalia, WA
- Average humidity in December: 85%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (36%).
Average rainfall in December
Rosalia, WA
- Average rainfall in December: 0.79"
The wettest months (with the highest rainfall) are January and May (0.91").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Rosalia, WA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in December
Rosalia, WA
- Average snowfall in December: 2.91"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and October (0").
Average snowfall days in December
Rosalia, WA
- Average snowfall days in December: 9.3 days
The month with the highest number of snowfall days is December (9.3 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Rosalia, WA
- Average daylight in December: 8h and 4min
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 36min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in December
Rosalia, WA
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is February (15.9 days).
Average UV index in December
Rosalia, 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
Rosalia, WA
- Average cloud cover in December: 55
The months with the most cloud cover are January and December (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in December
Rosalia, WA
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Rosalia, Washington, USA
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