December weather forecastChattaroy, WA
December
Weather in December
December, the first month of the winter in Chattaroy, is also a subzero cold month, with an average temperature fluctuating between 31.3°F (-0.4°C) and 20.3°F (-6.5°C).Temperature
In Chattaroy, the month of December registers the lowest temperatures, averaging 31.3°F (-0.4°C) at the peak and 20.3°F (-6.5°C) at the lowest.Humidity
The average relative humidity in December in Chattaroy is 89%.Rainfall
In Chattaroy, during December, the rain falls for 9.2 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, there are 124.9 rainfall days, and 17.44" (443mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Chattaroy, during December, snow falls for 16.9 days and regularly aggregates up to 10.47" (266mm) of snow. In Chattaroy, during the entire year, snow falls for 69.2 days and aggregates up to 42.99" (1092mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 7:18 am and sunset at 3:58 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:06 pm PST.
Sunshine
The average sunshine in December in Chattaroy is 3.5h.UV index
The months with the lowest UV index in Chattaroy are February, November and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 1 in December translates into this advice:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. 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
Chattaroy, WA
- Average high temperature in December: 31.3°F
The warmest month (with the highest average high temperature) is August (84°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in December: 20.3°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).
Average pressure in December
Chattaroy, WA
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in December
Chattaroy, WA
- Average wind speed in December: 4mph
The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in December
Chattaroy, WA
- Average humidity in December: 89%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Chattaroy, WA
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is January (2.4").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in December
Chattaroy, WA
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in December
Chattaroy, WA
- Average snowfall in December: 10.47"
The month with the highest snowfall is January (13.23").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Chattaroy, WA
- Average snowfall days in December: 16.9 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Chattaroy, WA
- Average daylight in December: 8h and 30min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 3h and 30min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Chattaroy, WA
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is March (9.7 days).
Average UV index in December
Chattaroy, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in December
Chattaroy, WA
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Chattaroy, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
