December weather forecastGreenhorn, OR
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 8h and 54min
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 18min
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: 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: 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: 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: 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).
