December weather forecast
Salem, OR

An evening shot of the leafy town of Salem in Oregon
An evening shot of the leafy town of Salem in Oregon

Weather in December

December, the first month of the winter in Salem, is also a frosty month, with an average temperature ranging between max 45.5°F (7.5°C) and min 34.5°F (1.4°C).

Temperature

December is the coldest month, with an average high-temperature of 45.5°F (7.5°C) and an average low-temperature of 34.5°F (1.4°C).

Humidity

January, February and December, with an average relative humidity of 86%, are the most humid months.

Rainfall

The month with the most rainfall is December, when the rain falls for 18.3 days and typically aggregates up to 3.94" (100mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Salem. In December, it is snowing for 0.6 days. Throughout December, 0.35" (9mm) of snow is accumulated. In Salem, during the entire year, snow falls for 4.7 days and aggregates up to 2.48" (63mm) of snow.

Daylight

With an average of 8h and 51min of daylight, December has the shortest days of the year in Salem.
On the first day of December in Salem, sunrise is at 7:29 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:40 pm PST.

Sunshine

In December, the average sunshine is 4.3h.

UV index

The months with the lowest UV index in Salem are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Salem?

With an average high-temperature of 45.5°F (7.5°C) and an average low-temperature of 34.5°F (1.4°C), December is the coldest month.

What is the temperature in December in Salem?

In December, in Salem, the average high-temperature is 45.5°F (7.5°C), and the average low-temperature is 34.5°F (1.4°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is appraised at 86°F (30°C).

What are the most humid months in Salem?

The months with the highest humidity in Salem, Oregon, are January, February and December, with an average relative humidity of 86%.

What is the average humidity in December in Salem?

In Salem, the average relative humidity in December is 86%.

What is the rainiest month in Salem?

The month with the most rainfall in Salem, Oregon, is December, when the rain falls for 18.3 days and typically aggregates up to 3.94" (100mm) of precipitation.

How many days does it rain in December in Salem?

In December, in Salem, Oregon, the rain falls for 18.3 days. Throughout December, 3.94" (100mm) of precipitation is accumulated.

How much does it snow in Salem in December?

In Salem, in December, during 0.6 snowfall days, 0.35" (9mm) of snow is typically accumulated.

What is the month with the shortest days in Salem?

The month with the shortest days is December, with an average of 8h and 51min of daylight.

What is the average length of the day in December in Salem?

In December, the average day length is 8h and 51min.

When is the sunrise / sunset in December in Salem?

In December, on the first day of the month, sunrise is at 7:29 am and sunset at 4:32 pm. On the last day of the month, in Salem, sunrise is at 7:50 am and sunset at 4:40 pm PST.

How long on average sun shines in December in Salem?

The average sunshine duration in December in Salem, Oregon, is 4.3h.

What are the months with the lowest UV index in Salem?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Salem?

In Salem, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
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
Salem, OR

Average temperature in December - Salem, OR
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (45.5°F).

  • Average low temperature in December: 34.5°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 (34.5°F).

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Average pressure in December
Salem, OR

Average pressure in December - Salem, OR
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

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Average wind speed in December
Salem, OR

Average wind speed in December - Salem, OR
  • Average wind speed in December: 5.3mph

The windiest months (with the highest average wind speed) are January, March and November (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

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Average humidity in December
Salem, OR

Average humidity in December - Salem, OR
  • Average humidity in December: 86%

The months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is August (65%).

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Average rainfall in December
Salem, OR

Average rainfall in December - Salem, OR
  • Average rainfall in December: 3.94"

The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in December
Salem, OR

Average rainfall days in December - Salem, OR
  • Average rainfall days in December: 18.3 days

The month with the highest number of rainy days is March (19.6 days).
The month with the least rainy days is July (3.9 days).

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Average snowfall in December
Salem, OR

Average snowfall in December - Salem, OR
  • Average snowfall in December: 0.35"

The month with the highest snowfall is February (1.18").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Salem, OR

Average snowfall days in December - Salem, OR
  • Average snowfall days in December: 0.6 days

The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Salem, OR

Average daylight in December / Average sunshine in December - Salem, OR
  • Average daylight in December: 8h and 51min

The month with the longest days is June (Average daylight: 15h and 33min).
The month with the shortest days is December (Average daylight: 8h and 51min).

  • Average sunshine in December: 4h and 18min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

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Average sunshine days in December
Salem, OR

Average sunshine days in December - Salem, OR
  • Average sunshine days in December: 10.6 days

The month with the most sunshine days is July (26.3 days).
The month with the least sunshine days is March (8.8 days).

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Average UV index in December
Salem, OR

Average UV index in December - Salem, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Salem, OR

Average cloud cover in December - Salem, OR
  • Average cloud cover in December: 56

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in December
Salem, OR

Average visibility in December - Salem, OR
  • Average visibility in December: 5mi

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).

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