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

December weather forecast and climate
Astoria, OR

A scenic seaside shot of the city of Astoria in Oregon, with a view of the iconic Astoria Megler bridge crossing over the Columbia River
A scenic seaside shot of the city of Astoria in Oregon, with a view of the iconic Astoria Megler bridge crossing over the Columbia River
The first month of the winter, December, is also a frosty month in Astoria, Oregon, with average temperature varying between 36.7°F (2.6°C) and 48.7°F (9.3°C).

Temperature

The coldest month is December, with an average high-temperature of 48.7°F (9.3°C) and an average low-temperature of 36.7°F (2.6°C).

Rainfall

In December, the rain falls for 20.6 days. Throughout December, 9.9" (251mm) of precipitation is accumulated. Throughout the year, in Astoria, there are 191.1 rainfall days, and 67.2" (1708.1mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Astoria are January, February, November and December.

Ocean temperature

In Astoria, the average seawater temperature in December is 49.6°F (9.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

With an average of 8.7h of daylight, December has the shortest days of the year.

Sunshine

Months with the least sunshine are November and December, with an average of 2h of sunshine.

UV index

Months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for average individuals.
The daily maximum UV index of 1 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Astoria?

With an average high-temperature of 48.7°F (9.3°C) and an average low-temperature of 36.7°F (2.6°C), December is the coldest month in Astoria.

What is the temperature in December in Astoria?

The average high-temperature, in December, in Astoria, Oregon, is 48.7°F (9.3°C), while the average low-temperature is 36.7°F (2.6°C).

How much does it rain in Astoria in December?

In Astoria, Oregon, in December, during 20.6 rainfall days, 9.9" (251mm) of precipitation is typically accumulated.

How many days does it snow in December in Astoria?

In Astoria, in December, during 0.2 snowfall days, 0.1" (2.5mm) of snow is typically accumulated.

What is the ocean temperature in December in Astoria?

In December, the average ocean temperature in Astoria, Oregon, is 49.6°F (9.8°C). Swimming in 49.6°F (9.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Astoria?

With an average of 8.7h of daylight, December has the shortest days of the year.

How many hours of daylight does Astoria have in December?

In December, the average length of the day in Astoria, Oregon, is 8.7h.

What is the month with the least sunshine in Astoria?

Months with the least sunshine are November and December, with an average of 2h of sunshine.

How many hours of sunshine does Astoria have in December?

In Astoria, the average sunshine in December is 2h.

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

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index reading in December in Astoria?

The average daily maximum UV index in December in Astoria, Oregon, is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in December - Astoria, OR
  • Average high temperature in December: 48.7°F

The warmest month (with the highest average high temperature) is August (68.7°F).
The month with the lowest average high temperature is December (48.7°F).

  • Average low temperature in December: 36.6°F

Months with the highest average low temperature are July and August (53.1°F).
The coldest month (with the lowest average low temperature) is December (36.6°F).

Average rainfall in December - Astoria, OR
  • Average rainfall in December: 9.9"

The wettest month (with the highest rainfall) is November (11.2").
The driest month (with the lowest rainfall) is July (1").

Average rainfall days in December - Astoria, OR
  • Average rainfall days in December: 20.6 days

Months with the highest number of rainy days are January and November (21.4 days).
The month with the lowest number of rainy days is August (7.4 days).

Average snowfall in December - Astoria, OR
  • Average snowfall in December: 0.1"

The month with the highest snowfall is January (0.5").
Months with the lowest snowfall are March, April, May, June, July, August, September and October (0").

Average snowfall days in December - Astoria, OR
  • Average snowfall days in December: 0.2 days

Months with the highest number of snowfall days are January and February (0.4 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September and October (0 days).

Average sea temperature in December - Astoria, OR
  • Average sea temperature in December: 49.6°F

The best month for swimming (with the highest average sea temperature) is July (56.9°F).
The coldest month (with the lowest average sea temperature) is February (47.7°F).

Average daylight in December / Average sunshine in December - Astoria, OR
  • Average daylight in December: 8.7h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).

  • Average sunshine in December: 2h

The month with most sunshine is July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 2).

Average UV index in December - Astoria, OR
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).