December weather forecast
Siletz, OR

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Weather in December

December, the first month of the winter in Siletz, is still a chilly month, with temperature in the range of an average high of 47.7°F (8.7°C) and an average low of 40.6°F (4.8°C).

Temperature

Siletz reaches its lowest average temperatures in December, measuring 47.7°F (8.7°C) at the peak and 40.6°F (4.8°C) at the lowest.

Humidity

The months with the highest humidity are February, March, November and December, with an average relative humidity of 83%.

Rainfall

December is the month with the most rainfall. Rain falls for 16.5 days and accumulates 3.07" (78mm) of precipitation.

Snowfall

March through October and December are months without snowfall in Siletz.

Daylight

The month with the shortest days is December, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:33 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:45 pm PST.

Sunshine

In Siletz, the average sunshine in December is 4.2h.

UV index

The months with the lowest UV index in Siletz are February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In December, an average UV index of 2 transforms into the following instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.

Frequently asked questions

What are the coldest months?

The month of December sees the average lowest temperatures, reaching 47.7°F (8.7°C) at the peak and 40.6°F (4.8°C) at the low.

What is the temperature in December?

The high-temperature, in December, in Siletz, records 47.7°F (8.7°C), while the low-temperature is 40.6°F (4.8°C).

What is the most humid month?

February, March, November and December, with an average relative humidity of 83%, are most humid months.

What is the average humidity in December?

In December, the average relative humidity is 83%.

What is the rainiest month?

The month with the most rainfall is December, when the rain falls for 16.5 days and typically aggregates up to 3.07" (78mm) of precipitation.

How much does it rain in December?

In Siletz, during December, the rain falls for 16.5 days and regularly aggregates up to 3.07" (78mm) of precipitation.

When it does not snow?

In Siletz, snow does not fall in March through October and December.

Does it snow in December?

In December, it doesn't snow. November is the latest month when it typically snows.

What is the month with the shortest days?

With an average of 8h and 54min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In December, the average day length is 8h and 52min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:33 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 4:45 pm PST.

How many hours of sunshine does Siletz have in December?

The average sunshine duration in December is 4.2h.

What is the month with the lowest UV index in Siletz?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Siletz, OR

Average temperature in December - Siletz, OR
  • Average high temperature in December: 47.7°F

The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (47.7°F).

  • Average low temperature in December: 40.6°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 (40.6°F).

Average pressure in December
Siletz, OR

Average pressure in December - Siletz, OR
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is September (30.02"Hg).

Average wind speed in December
Siletz, OR

Average wind speed in December - Siletz, OR
  • Average wind speed in December: 9.4mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in December
Siletz, OR

Average humidity in December - Siletz, OR
  • Average humidity in December: 83%

The months with the highest relative humidity are February, March, November and December (83%).
The months with the lowest relative humidity are April, May, July, September and October (81%).

Average rainfall in December
Siletz, OR

Average rainfall in December - Siletz, OR
  • Average rainfall in December: 3.07"

The wettest month (with the highest rainfall) is December (3.07").
The driest month (with the least rainfall) is July (0.16").

Average rainfall days in December
Siletz, OR

Average rainfall days in December - Siletz, OR
  • Average rainfall days in December: 16.5 days

The month with the highest number of rainy days is March (18.2 days).
The month with the least rainy days is August (3.7 days).

Average snowfall in December
Siletz, OR

Average snowfall in December - Siletz, OR
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").

Average snowfall days in December
Siletz, OR

Average snowfall days in December - Siletz, OR
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Siletz, OR

Average daylight in December / Average sunshine in December - Siletz, OR
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 4h and 0min).

Average sunshine days in December
Siletz, OR

Average sunshine days in December - Siletz, OR
  • Average sunshine days in December: 11.8 days

The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is March (10.9 days).

Average UV index in December
Siletz, OR

Average UV index in December - Siletz, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February, November and December (UV index 2).

Average cloud cover in December
Siletz, OR

Average cloud cover in December - Siletz, OR
  • Average cloud cover in December: 56

The months with the most cloud cover are February and March (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in December
Siletz, OR

Average visibility in December - Siletz, OR
  • Average visibility in December: 6mi

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

Siletz, Oregon, USA

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