December weather forecast
Olympia, WA

The calm Capitol Lake overlooking the Washington State Capitol building in Olympia, Washington
The calm Capitol Lake overlooking the Washington State Capitol building in Olympia, Washington

Weather in December

The first month of the winter, December, is still a chilly month in Olympia, Washington, with temperature in the range of an average low of 33.4°F (0.8°C) and an average high of 43°F (6.1°C).

Temperature

December is the coldest month, with an average high-temperature of 43°F (6.1°C) and an average low-temperature of 33.4°F (0.8°C).

Humidity

January, November and December, with an average relative humidity of 89%, are the most humid months.

Rainfall

The month with the most rainfall in Olympia is December, when the rain falls for 18.8 days and typically aggregates up to 5.79" (147mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Olympia, Washington, during December, snow falls for 1.4 days and regularly aggregates up to 0.31" (8mm) of snow. Throughout the year, in Olympia, there are 8.7 snowfall days, and 5.31" (135mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Olympia, with an average of 8h and 35min of daylight.
On the first day of the month, sunrise is at 7:37 am and sunset at 4:24 pm. On the last day of December, sunrise is at 7:57 am and sunset at 4:32 pm PST.

Sunshine

December has the least sunshine of the year in Olympia, with an average of 3.4h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Olympia?

With an average high-temperature of 43°F (6.1°C) and an average low-temperature of 33.4°F (0.8°C), December is the coldest month in Olympia, Washington.

What are the most humid months in Olympia?

The months with the highest humidity are January, November and December, with an average relative humidity of 89%.

What is the average humidity in December in Olympia?

In December, the average relative humidity in Olympia is 89%.

What is the wettest month in Olympia?

The month with the most rainfall is December, when the rain falls for 18.8 days and typically aggregates up to 5.79" (147mm) of precipitation.

How many days does it rain in December in Olympia?

In December, in Olympia, the rain falls for 18.8 days. Throughout December, 5.79" (147mm) of precipitation is accumulated.

How many days does it snow in December in Olympia?

In Olympia, Washington, during December, snow falls for 1.4 days and regularly aggregates up to 0.31" (8mm) of snow.

What is the month with the shortest days in Olympia?

December has the shortest days of the year in Olympia, Washington, with an average of 8h and 35min of daylight.

How many hours of daylight does Olympia have in December?

In December, the average day length in Olympia is 8h and 35min.

When is the sunrise / sunset in December in Olympia?

On the first day of December in Olympia, Washington, sunrise is at 7:37 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:57 am and sunset at 4:32 pm PST.

What is the month with the least sunshine in Olympia?

December has the least sunshine of the year, with an average of 3.4h of sunshine.

How long on average sun shines in December in Olympia?

The average sunshine duration in December in Olympia, Washington, is 3.4h.

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

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

What is the UV index intensity in December in Olympia?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average max. wind speed
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
Olympia, WA

Average temperature in December - Olympia, WA
  • Average high temperature in December: 43°F

The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (43°F).

  • Average low temperature in December: 33.4°F

The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (33.4°F).

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Average pressure in December
Olympia, WA

Average pressure in December - Olympia, WA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).

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Average wind speed in December
Olympia, WA

Average wind speed in December - Olympia, WA
  • Average wind speed in December: 4.2mph

The windiest months (with the highest average wind speed) are March and November (4.6mph).
The calmest month (with the lowest average wind speed) is September (3.8mph).

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Average humidity in December
Olympia, WA

Average humidity in December - Olympia, WA
  • Average humidity in December: 89%

The months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in December
Olympia, WA

Average rainfall in December - Olympia, WA
  • Average rainfall in December: 5.79"

The wettest month (with the highest rainfall) is December (5.79").
The driest month (with the least rainfall) is July (0.39").

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Average rainfall days in December
Olympia, WA

Average rainfall days in December - Olympia, WA
  • Average rainfall days in December: 18.8 days

The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (5.5 days).

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Average snowfall in December
Olympia, WA

Average snowfall in December - Olympia, WA
  • Average snowfall in December: 0.31"

The month with the highest snowfall is February (2.32").
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
Olympia, WA

Average snowfall days in December - Olympia, WA
  • Average snowfall days in December: 1.4 days

The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Olympia, WA

Average daylight in December / Average sunshine in December - Olympia, WA
  • Average daylight in December: 8h and 35min

The month with the longest days is June (Average daylight: 15h and 50min).
The month with the shortest days is December (Average daylight: 8h and 35min).

  • Average sunshine in December: 3h and 24min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).

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Average sunshine days in December
Olympia, WA

Average sunshine days in December - Olympia, WA
  • Average sunshine days in December: 9.8 days

The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index in December
Olympia, WA

Average UV index in December - Olympia, WA
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 5).
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
Olympia, WA

Average cloud cover in December - Olympia, WA
  • Average cloud cover in December: 65

The months with the most cloud cover are January and December (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 35).

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Average visibility in December
Olympia, WA

Average visibility in December - Olympia, WA
  • Average visibility in December: 4mi

The months with the highest visibility are June, July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (4mi).

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