December weather forecastJohn Day, OR
December
Weather in December
December in John Day, Oregon is characterized by a full-fledged winter. The weather element that makes this month exceptional is the most pronounced quantity of snowfall at 8.31" (211mm). The weather remains cold, often with freezing mornings and nights. This period offers many festive outdoor activities such as ice skating and snowball fights. Finally, the year ends with light winds and fluffy snow, bringing joy to holiday celebrations.Temperature
The coldest time of the year is December, with temperatures averaging a high of 33.4°F (0.8°C) and a low of 19.6°F (-6.9°C).Humidity
In John Day, the average relative humidity in December is 84%.Rainfall
In December, the rain falls for 11.1 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. In John Day, during the entire year, the rain falls for 127.7 days and collects up to 17.09" (434mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In John Day, in December, during 14.5 snowfall days, 8.31" (211mm) of snow is typically accumulated. Throughout the year, there are 62.5 snowfall days, and 39.17" (995mm) of snow is accumulated.Daylight
With an average of 8h and 54min of daylight, December has the shortest days of the year in John Day, Oregon.On the first day of the month, sunrise is at 7:12 am and sunset at 4:17 pm. On the last day of December, sunrise is at 7:31 am and sunset at 4:26 pm PST.
Sunshine
In December, the average sunshine is 5.3h.UV index
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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
John Day, 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).
