December weather forecastVernonia, OR
December
Weather in December
December, the first month of the winter in Vernonia, is still a cold month, with an average temperature fluctuating between 32.9°F (0.5°C) and 42.1°F (5.6°C).Temperature
December, with an average high of 42.1°F (5.6°C) and a low of 32.9°F (0.5°C), signifies the coldest month of the year.Humidity
In Vernonia, the average relative humidity in December is 88%.Rainfall
In Vernonia, in December, it is raining for 19.3 days, with typically 5.47" (139mm) of accumulated precipitation. Throughout the year, there are 184.4 rainfall days, and 36.61" (930mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In December, it is snowing for 1.9 days. Throughout December, 0.63" (16mm) of snow is accumulated. In Vernonia, during the entire year, snow falls for 11.8 days and aggregates up to 10.24" (260mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:34 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:54 am and sunset at 4:38 pm PST.
Sunshine
In Vernonia, the average sunshine in December is 3.4h.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 value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Vernonia, OR
- Average high temperature in December: 42.1°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.1°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in December
Vernonia, OR
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.02"Hg).
Average wind speed in December
Vernonia, OR
- Average wind speed in December: 4.7mph
The windiest months (with the highest average wind speed) are January, March and November (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in December
Vernonia, OR
- Average humidity in December: 88%
The month with the highest relative humidity is November (89%).
The month with the lowest relative humidity is July (73%).
Average rainfall in December
Vernonia, OR
- Average rainfall in December: 5.47"
The wettest month (with the highest rainfall) is January (5.79").
The driest months (with the least rainfall) are July and August (0.51").
Average rainfall days in December
Vernonia, OR
- Average rainfall days in December: 19.3 days
The month with the highest number of rainy days is March (21.7 days).
The month with the least rainy days is July (6 days).
Average snowfall in December
Vernonia, OR
- Average snowfall in December: 0.63"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Vernonia, OR
- Average snowfall days in December: 1.9 days
The month with the highest number of snowfall days is February (4.4 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
Vernonia, OR
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 3h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 18min).
Average sunshine days in December
Vernonia, OR
- Average sunshine days in December: 9.5 days
The month with the most sunshine days is July (22.1 days).
The months with the least sunshine days are February and March (7.6 days).
Average UV index in December
Vernonia, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Vernonia, OR
- Average cloud cover in December: 65
The months with the most cloud cover are February and March (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Vernonia, OR
- Average visibility in December: 4mi
The months with the highest visibility are July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (4mi).
