December weather forecast
Greenhorn, OR

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Weather in December

The first month of the winter, December, is also an icy month in Greenhorn, Oregon, with an average temperature fluctuating between 19.6°F (-6.9°C) and 33.4°F (0.8°C).

Temperature

The coldest month is December, with an average high-temperature of 33.4°F (0.8°C) and an average low-temperature of 19.6°F (-6.9°C).

Humidity

In Greenhorn, the average relative humidity in December is 84%.

Rainfall

In Greenhorn, in December, it is raining for 11.1 days, with typically 2.24" (57mm) of accumulated precipitation. Throughout the year, there are 127.7 rainfall days, and 17.09" (434mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In Greenhorn, in December, during 14.5 snowfall days, 8.31" (211mm) of snow is typically accumulated. In Greenhorn, during the entire year, snow falls for 62.5 days and aggregates up to 39.17" (995mm) of snow.

Daylight

The month with the shortest days in Greenhorn is December, with an average of 8h and 54min of daylight.
On the first day of December in Greenhorn, sunrise is at 7:11 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:23 pm PST.

Sunshine

In December, the average sunshine is 5.3h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily high UV index of 2 in December leads to these guidelines:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.

Frequently asked questions

What are the coldest months?

December is the month that records the lowest temperatures, with averages ranging from a high of 33.4°F (0.8°C) to a low of 19.6°F (-6.9°C).

How cold is December?

In December, in Greenhorn, the average high-temperature is 33.4°F (0.8°C), and the average low-temperature is 19.6°F (-6.9°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 80.6°F (27°C).

What is the average humidity in December?

In December, the average relative humidity is 84%.

How many days does it rain in December?

In Greenhorn, Oregon, in December, it is raining for 11.1 days, with typically 2.24" (57mm) of accumulated precipitation.

How much does it snow in December?

In Greenhorn, in December, snow falls for 14.5 days, with typically accumulated 8.31" (211mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Greenhorn have in December?

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

What time are sunrise and sunset in December in Greenhorn?

In December, on the first day of the month, sunrise is at 7:11 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:23 pm PST.

How many hours of sunshine does Greenhorn have in December?

The average sunshine duration in December is 5.3h.

What are the months with the lowest UV index?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Greenhorn.

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to Sun's UV rays.
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
Greenhorn, OR

Average temperature in December - Greenhorn, OR
  • Average high temperature in December: 33.4°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (33.4°F).

  • Average low temperature in December: 19.6°F

The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (19.6°F).

Average pressure in December
Greenhorn, OR

Average pressure in December - Greenhorn, OR
  • Average pressure in December: 30.19"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

Average wind speed in December
Greenhorn, OR

Average wind speed in December - Greenhorn, OR
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).

Average humidity in December
Greenhorn, OR

Average humidity in December - Greenhorn, OR
  • Average humidity in December: 84%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (42%).

Average rainfall in December
Greenhorn, OR

Average rainfall in December - Greenhorn, OR
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is February (2.28").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in December
Greenhorn, OR

Average rainfall days in December - Greenhorn, OR
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (3.3 days).

Average snowfall in December
Greenhorn, OR

Average snowfall in December - Greenhorn, OR
  • Average snowfall in December: 8.31"

The month with the highest snowfall is February (10.31").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Greenhorn, OR

Average snowfall days in December - Greenhorn, OR
  • Average snowfall days in December: 14.5 days

The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Greenhorn, 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: 5h and 2min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).

Average sunshine days in December
Greenhorn, OR

Average sunshine days in December - Greenhorn, OR
  • Average sunshine days in December: 11.4 days

The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is February (9 days).

Average UV index in December
Greenhorn, OR

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in December
Greenhorn, OR

Average cloud cover in December - Greenhorn, OR
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in December
Greenhorn, OR

Average visibility in December - Greenhorn, OR
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Greenhorn, Oregon, USA

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