December weather forecastSummerville, OR
December
Weather in December
December, the first month of the winter in Summerville, is also a wintry month, with an average temperature fluctuating between 21°F (-6.1°C) and 33.8°F (1°C).Temperature
In Summerville, December is the coldest month, with temperatures averaging a high of 33.8°F (1°C) and a low of 21°F (-6.1°C).Humidity
In December, the average relative humidity is 85%.Rainfall
In Summerville, in December, during 11.6 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. In Summerville, during the entire year, the rain falls for 137.5 days and collects up to 20.94" (532mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In Summerville, in December, during 14.2 snowfall days, 10.94" (278mm) of snow is typically accumulated. In Summerville, during the entire year, snow falls for 68.6 days and aggregates up to 52.4" (1331mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:10 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:18 pm PST.
Sunshine
In Summerville, the average sunshine in December is 5.1h.UV index
In Summerville, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Summerville, OR
- Average high temperature in December: 33.8°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (33.8°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is August (51.4°F).
The coldest month (with the lowest average low temperature) is December (21°F).
Average pressure in December
Summerville, OR
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Summerville, OR
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in December
Summerville, OR
- Average humidity in December: 85%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (47%).
Average rainfall in December
Summerville, OR
- Average rainfall in December: 2.72"
The wettest month (with the highest rainfall) is January (2.99").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Summerville, OR
- Average rainfall days in December: 11.6 days
The month with the highest number of rainy days is March (17.8 days).
The month with the least rainy days is August (4.3 days).
Average snowfall in December
Summerville, OR
- Average snowfall in December: 10.94"
The month with the highest snowfall is February (13.62").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Summerville, OR
- Average snowfall days in December: 14.2 days
The months with the highest number of snowfall days are February and December (14.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Summerville, OR
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 5h and 6min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Summerville, OR
- Average sunshine days in December: 12.1 days
The month with the most sunshine days is August (24.3 days).
The month with the least sunshine days is March (7.6 days).
Average UV index in December
Summerville, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Summerville, OR
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Summerville, OR
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is February (4mi).
