December weather forecastGrants Pass, OR
December
Weather in December
December officially kickstarts the winter season in Grants Pass with a marked drop in temperatures. The city receives the highest rainfall of the year, accumulating up to 4.02" (102mm) over roughly 15.9 days. The limited daylight hours primarily contribute to the cold winter days. Wind speeds increase slightly, adding to the overall chill. A snowfall of 0.51" (13mm) paints the city in a quintessential winter landscape, rounding up the weather feature-full year.Temperature
The month of December, characterized by an average high of 46°F (7.8°C) and a low of 31.5°F (-0.3°C), is recognized as the coldest.Humidity
In Grants Pass, the average relative humidity in December is 84%.Rainfall
The month with the most rainfall is December, when the rain falls for 15.9 days and typically aggregates up to 4.02" (102mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Grants Pass, Oregon, in December, during 1.1 snowfall days, 0.51" (13mm) of snow is typically accumulated. In Grants Pass, during the entire year, snow falls for 7.9 days and aggregates up to 5.12" (130mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:23 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:50 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 4.7h 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 minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 during December translates into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grants Pass, OR
- Average high temperature in December: 46°F
The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (46°F).
- Average low temperature in December: 31.5°F
The month with the highest average low temperature is August (49.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).
Average pressure in December
Grants Pass, OR
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in December
Grants Pass, OR
- Average wind speed in December: 3.7mph
The windiest month (with the highest average wind speed) is March (4mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in December
Grants Pass, OR
- Average humidity in December: 84%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (63%).
Average rainfall in December
Grants Pass, OR
- Average rainfall in December: 4.02"
The wettest month (with the highest rainfall) is December (4.02").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in December
Grants Pass, OR
- Average rainfall days in December: 15.9 days
The month with the highest number of rainy days is March (18.7 days).
The month with the least rainy days is August (2.5 days).
Average snowfall in December
Grants Pass, OR
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Grants Pass, OR
- Average snowfall days in December: 1.1 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Grants Pass, OR
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 42min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in December
Grants Pass, OR
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is March (10.8 days).
Average UV index in December
Grants Pass, 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, November and December (UV index 2).
Average cloud cover in December
Grants Pass, OR
- Average cloud cover in December: 52
The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in December
Grants Pass, OR
- Average visibility in December: 4mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
