December weather forecastRichmond Highlands, WA
December
Weather in December
The first month of the winter, December, is also a frosty month in Richmond Highlands, Washington, with an average temperature varying between 43.3°F (6.3°C) and 35.8°F (2.1°C).Temperature
Richmond Highlands's coldest month, December, generally records average temperatures ranging from a high of 43.3°F (6.3°C) to a low of 35.8°F (2.1°C).Humidity
The months with the highest humidity are January, February and December, with an average relative humidity of 84%.Rainfall
The month with the most rainfall in Richmond Highlands is December, when the rain falls for 17.6 days and typically aggregates up to 3.5" (89mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Richmond Highlands, in December, during 2.2 snowfall days, 0.43" (11mm) of snow is typically accumulated. In Richmond Highlands, during the entire year, snow falls for 12.5 days and aggregates up to 6.65" (169mm) of snow.Daylight
With an average of 8h and 30min of daylight, December has the shortest days of the year in Richmond Highlands.On the first day of the month, sunrise is at 7:38 am and sunset at 4:19 pm. On the last day of December, sunrise is at 7:58 am and sunset at 4:27 pm PST.
Sunshine
The average sunshine in December is 4.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Richmond Highlands. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Richmond Highlands, WA
- Average high temperature in December: 43.3°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is December (43.3°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (35.8°F).
Average pressure in December
Richmond Highlands, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Richmond Highlands, WA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is November (5.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
Richmond Highlands, WA
- Average humidity in December: 84%
The months with the highest relative humidity are January, February and December (84%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Richmond Highlands, WA
- Average rainfall in December: 3.5"
The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
Richmond Highlands, WA
- Average rainfall days in December: 17.6 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in December
Richmond Highlands, WA
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Richmond Highlands, WA
- Average snowfall days in December: 2.2 days
The month with the highest number of snowfall days is February (4.7 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
Richmond Highlands, WA
- Average daylight in December: 8h and 30min
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: 4h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Richmond Highlands, WA
- Average sunshine days in December: 10.8 days
The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is November (9.2 days).
Average UV index in December
Richmond Highlands, WA
- Average UV index in December: 2
The months with the highest UV index are June and 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
Richmond Highlands, 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 August (Cloud cover 25).
Average visibility in December
Richmond Highlands, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
