December weather forecastMaple Valley, WA
December
Weather in December
The first month of the winter, December, is still a cold month in Maple Valley, Washington, with temperature in the range of an average high of 40.8°F (4.9°C) and an average low of 32°F (0°C).Temperature
In Maple Valley, the lowest temperatures are generally noted in December, averaging a high of 40.8°F (4.9°C) and a low of 32°F (0°C).Humidity
In Maple Valley, the average relative humidity in December is 85%.Rainfall
The month with the most rainfall is December, when the rain falls for 18.7 days and typically aggregates up to 5.43" (138mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Maple Valley, in December, snow falls for 3.9 days, with typically accumulated 1.65" (42mm) of snow. In Maple Valley, Washington, during the entire year, snow falls for 19.7 days and aggregates up to 11.5" (292mm) 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 December, sunrise is at 7:35 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:27 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 4.1h of sunshine.UV index
The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Maple Valley, WA
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (40.8°F).
- Average low temperature in December: 32°F
The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is February (31.6°F).
Average pressure in December
Maple Valley, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30"Hg).
Average wind speed in December
Maple Valley, WA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is January (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
Maple Valley, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is July (70%).
Average rainfall in December
Maple Valley, WA
- Average rainfall in December: 5.43"
The wettest month (with the highest rainfall) is December (5.43").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in December
Maple Valley, WA
- Average rainfall days in December: 18.7 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (6.7 days).
Average snowfall in December
Maple Valley, WA
- Average snowfall in December: 1.65"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Maple Valley, WA
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is February (6 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Maple Valley, 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 6min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 6min).
Average sunshine days in December
Maple Valley, WA
- Average sunshine days in December: 10.3 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in December
Maple Valley, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in December
Maple Valley, WA
- Average cloud cover in December: 57
The months with the most cloud cover are January, February, March and December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Maple Valley, WA
- Average visibility in December: 4mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
