December weather forecast
Olalla, WA

Weather in December

The first month of the winter, December, is also a frosty month in Olalla, Washington, with temperature in the range of an average low of 34.9°F (1.6°C) and an average high of 43.2°F (6.2°C).

Temperature

December is the coldest month, with an average high-temperature of 43.2°F (6.2°C) and an average low-temperature of 34.9°F (1.6°C).

Humidity

With an average relative humidity of 87%, December is the most humid month.

Rainfall

The wettest months in Olalla are January and December, with an average 2.05" (52mm) of rainfall.

Snowfall

January through March, November and December are months with snowfall in Olalla. In December, it is snowing for 1 days. Throughout December, 0.12" (3mm) of snow is accumulated. Throughout the year, there are 7 snowfall days, and 2.36" (60mm) of snow is accumulated.

Ocean temperature

In Olalla, the average seawater temperature in December is 46.9°F (8.3°C).
Note: Swimming in 46.9°F (8.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The month with the shortest days in Olalla, Washington, is December, with an average of 8.5h of daylight.

Sunshine

December has the least sunshine of the year in Olalla, with an average of 4.1h 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 reading of 2, and below, represents a low threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 2 in December transform into the following instructions:
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 Olalla?

The coldest month in Olalla, Washington, is December, with an average high-temperature of 43.2°F (6.2°C) and an average low-temperature of 34.9°F (1.6°C).

What is the most humid month in Olalla?

The most humid month in Olalla, Washington, is December, with an average relative humidity of 87%.

What is the average humidity in December in Olalla?

In December, the average relative humidity in Olalla, Washington, is 87%.

What is the rainiest month in Olalla?

The wettest months in Olalla are January and December, with an average 2.05" (52mm) of rainfall.

How much does it rain in Olalla in December?

In December, in Olalla, Washington, the rain falls for 14.3 days. Throughout December, 2.05" (52mm) of precipitation is accumulated.

How many days does it snow in December in Olalla?

In Olalla, Washington, in December, snow falls for 1 days, with typically accumulated 0.12" (3mm) of snow.

What is the water temperature in December in Olalla?

In Olalla, the average seawater temperature in December is 46.9°F (8.3°C). Swimming in 46.9°F (8.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Olalla?

December has the shortest days of the year, with an average of 8.5h of daylight.

How many hours of daylight does Olalla have in December?

In Olalla, the average length of the day in December is 8.5h.

What is the month with the least sunshine in Olalla?

With an average of 4.1h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Olalla have in December?

In December, the average sunshine in Olalla is 4.1h.

When is the lowest UV index in Olalla?

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

What is the UV index reading in December in Olalla?

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
Olalla, WA

Average temperature in December - Olalla, WA
  • Average high temperature in December: 43.2°F

The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (43.2°F).

  • Average low temperature in December: 34.9°F

The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).

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Average pressure in December
Olalla, WA

Average pressure in December - Olalla, WA
  • Average pressure in December: 30.07"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are March, August and September (30.01").

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Average wind speed in December
Olalla, WA

Average wind speed in December - Olalla, WA
  • Average wind speed in December: 4.7mph

The windiest month (with the highest average wind speed) is March (5.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).

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Average humidity in December
Olalla, WA

Average humidity in December - Olalla, WA
  • Average humidity in December: 87%

The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in December
Olalla, WA

Average rainfall in December - Olalla, WA
  • Average rainfall in December: 2.05"

The wettest months (with the highest rainfall) are January and December (2.05").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in December
Olalla, WA

Average rainfall days in December - Olalla, WA
  • Average rainfall days in December: 14.3 days

The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is August (5.4 days).

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Average snowfall in December
Olalla, WA

Average snowfall in December - Olalla, WA
  • Average snowfall in December: 0.12"

The month with the highest snowfall is February (1.22").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Olalla, WA

Average snowfall days in December - Olalla, WA
  • Average snowfall days in December: 1 days

The month with the highest number of snowfall days is February (2.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
Olalla, WA

Average sea temperature in December - Olalla, WA
  • Average sea temperature in December: 46.9°F

The best month for swimming (with the highest average sea temperature) is August (53.3°F).
The coldest month (with the lowest average sea temperature) is February (45.8°F).

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

Average daylight in December / Average sunshine in December - Olalla, WA
  • Average daylight in December: 8.5h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in December: 4.1h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.1h).

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Average sunshine days in December
Olalla, WA

Average sunshine days in December - Olalla, WA
  • Average sunshine days in December: 13.8 days

The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (11.8 days).

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Average UV index in December
Olalla, WA

Average UV index in December - Olalla, WA
  • 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
Olalla, WA

Average cloud cover in December - Olalla, WA
  • Average cloud cover in December: 58

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in December
Olalla, WA

Average visibility in December - Olalla, WA
  • Average visibility in December: 5mi

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

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