December weather forecast
Summerville, OR

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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.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

With an average high-temperature of 33.8°F (1°C) and an average low-temperature of 21°F (-6.1°C), December is the coldest month in Summerville.

How cold is December?

In Summerville, 33.8°F (1°C) is the average high-temperature and 21°F (-6.1°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, is evaluated at 82.4°F (28°C).

What is the average humidity in December?

The average relative humidity in December is 85%.

How many days does it rain in December?

In December, the rain falls for 11.6 days. Throughout December, 2.72" (69mm) of precipitation is accumulated.

How many days does it snow in December?

In December, in Summerville, it is snowing for 14.2 days. Throughout December, 10.94" (278mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 48min of daylight.

What is the average length of the day in December?

In December, the average day length is 8h and 47min.

When is the sunrise / sunset in December?

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.

How many hours of sunshine does Summerville have in December?

The average sunshine duration in December is 5.1h.

What is the UV index reading in December?

The average daily maximum UV index in December in Summerville, Oregon, is 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Summerville, OR

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in December - Summerville, OR
  • Average daylight in December: 8h and 5min

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 1min

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 - 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 - 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 - 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 - 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).

Summerville, Oregon, USA

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