Salem
Oregon, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Salem, OR

An evening shot of the leafy town of Salem in Oregon, with a clear dusk sky
An evening shot of the leafy town of Salem in Oregon, with a clear dusk sky
The first month of the winter, December, is still a chilly month in Salem, Oregon, with temperature in the range of an average low of 34.5°F (1.4°C) and an average high of 45.5°F (7.5°C).

Temperature

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.

Humidity

January, February and December, with an average relative humidity of 86%, are 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

Months with snowfall in Salem, Oregon, are January through March, November and December. In Salem, during 0.6 snowfall days, 0.35" (9mm) of snow is typically accumulated. Throughout the year, in Salem, 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, Oregon.

Sunshine

In Salem, Oregon, the average sunshine is 4.3h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Salem. A UV Index value of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV radiation for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged 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.

What is the coldest month in Salem?

The coldest month in Salem is December, 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?

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

What is the average humidity in December in Salem?

In December, the average relative humidity is 86%.

How many days does it rain in December in Salem?

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

What is the wettest month in Salem?

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

How much does it snow in Salem in December?

In Salem, Oregon, 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?

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

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

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

How long on average sun shines in December in Salem?

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

When is the lowest UV index in Salem?

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

What is the UV index intensity in December in Salem?

In Salem, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV rays.
Average temperature in December - Salem, OR
  • Average high temperature in December: 7.5°C

The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is December (7.5°C).

  • Average low temperature in December: 1.4°C

The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is December (1.4°C).

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%).

Average rainfall in December - Salem, OR
  • Average rainfall in December: 100mm

The wettest month (with the highest rainfall) is December (100mm).
The driest month (with the lowest rainfall) is July (7mm).

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 lowest number of rainy days is July (3.9 days).

Average snowfall in December - Salem, OR
  • Average snowfall in December: 9mm

The month with the highest snowfall is February (30mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

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 lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

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 shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 4.3h

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

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).