December weather forecastBonneville, OR
December
Weather in December
The first month of the winter, December, is still a cold month in Bonneville, Oregon, with temperature in the range of an average low of 28.2°F (-2.1°C) and an average high of 37.9°F (3.3°C).Temperature
December tends to be the coldest month, with temperatures averaging a daily high of 37.9°F (3.3°C) and a low of 28.2°F (-2.1°C).Humidity
In December, the average relative humidity is 87%.Rainfall
In Bonneville, in December, during 18.5 rainfall days, 4.96" (126mm) of precipitation is typically accumulated. In Bonneville, during the entire year, the rain falls for 158.4 days and collects up to 30.31" (770mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In December, it is snowing for 2.5 days. Throughout December, 1.73" (44mm) of snow is accumulated. Throughout the year, there are 11.5 snowfall days, and 10" (254mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:28 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:48 am and sunset at 4:34 pm PST.
Sunshine
In December, the average sunshine is 3.3h.UV index
In Bonneville, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Around midday, solar radiation is most harmful; hence, exposure should be limited. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Bonneville, OR
- Average high temperature in December: 37.9°F
The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (37.9°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is August (48.7°F).
The coldest month (with the lowest average low temperature) is December (28.2°F).
Average pressure in December
Bonneville, OR
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in December
Bonneville, OR
- Average wind speed in December: 6.3mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in December
Bonneville, OR
- Average humidity in December: 87%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are July and August (67%).
Average rainfall in December
Bonneville, OR
- Average rainfall in December: 4.96"
The wettest month (with the highest rainfall) is January (5.35").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in December
Bonneville, OR
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (18.9 days).
The month with the least rainy days is July (4.4 days).
Average snowfall in December
Bonneville, OR
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (3.62").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Bonneville, OR
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is February (3.8 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
Bonneville, OR
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 18min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 12min).
Average sunshine days in December
Bonneville, OR
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is February (9.4 days).
Average UV index in December
Bonneville, OR
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Bonneville, OR
- Average cloud cover in December: 66
The month with the most cloud cover is February (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 26).
Average visibility in December
Bonneville, OR
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
