December weather forecast and climate
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 still a chilly month, with average temperature fluctuating between 34.5°F (1.4°C) and 45.5°F (7.5°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 most humid months in Salem.

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

Months with snowfall in Salem are January through March, November and December. In December, it is snowing for 0.6 days. Throughout December, 0.35" (9mm) of snow is accumulated. Throughout the year, there are 4.7 snowfall days, and 2.48" (63mm) of snow is accumulated.

Daylight

With an average of 8.8h of daylight, December has the shortest days of the year in Salem.

Sunshine

In December, the average sunshine is 4.3h.

UV index

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 reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Salem?

December 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).

What is the temperature in December in Salem?

The average high-temperature, in December, is 45.5°F (7.5°C), while the average low-temperature is 34.5°F (1.4°C).

What are the most humid months in Salem?

Months with the highest humidity in Salem 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%.

How much does it rain in Salem in December?

In Salem, during December, the rain falls for 18.3 days and regularly aggregates up to 3.94" (100mm) of precipitation.

What is the wettest month in Salem?

December is the month with the most rainfall in Salem, Oregon. Rain falls for 18.3 days and accumulates 3.94" (100mm) of precipitation.

How much does it snow in Salem in December?

In December, in Salem, Oregon, it is snowing for 0.6 days. Throughout December, 0.35" (9mm) of snow is accumulated.

What is the month with the shortest days in Salem?

With an average of 8.8h of daylight, December has the shortest days of the year in Salem.

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

In December, the average length of the day in Salem is 8.8h.

How long on average sun shines in December in Salem?

The average sunshine in December is 4.3h.

When is the lowest UV index in Salem?

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

What is the UV index intensity in December in Salem?

In Salem, Oregon, 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 the Sun's UV rays.

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"

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

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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%

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").
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).
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: 8.8h

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 4.3h

The month with the most sunshine is August (Average sunshine: 11h).
The month with the least sunshine is February (Average sunshine: 4.2h).

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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).
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

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

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