December weather forecastLebanon, OR
December
Weather in December
December, the final month of the year, brings with it the coldest temperatures and the highest rainfall averages. The weather in December witnesses a significant increase in precipitation, leading to the peak monthly rainfall average of 4.41" (112mm). Temperatures drop to their annual lows, and the wind speed slightly picks up compared to the previous months, adding to the chill factor. With limited daylight and primarily overcast skies, December sets in the winter mood. Thus, the year concludes with a strikingly cold and wet month.Temperature
December is the coldest month of the year, registering average temperatures as high as 45.3°F (7.4°C) and as low as 34.2°F (1.2°C).Humidity
The months with the highest humidity are January through March and December, with an average relative humidity of 86%.Rainfall
December is the month with the most rainfall in Lebanon. Rain falls for 18 days and accumulates 4.41" (112mm) of precipitation.Snowfall
Months with snowfall in Lebanon are January through March, November and December. In Lebanon, in December, during 0.7 snowfall days, 0.31" (8mm) of snow is typically accumulated. Throughout the year, there are 5.6 snowfall days, and 4.09" (104mm) of snow is accumulated.Daylight
With an average of 8h and 54min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:28 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:48 am and sunset at 4:41 pm PST.
Sunshine
The average sunshine in December is 4.3h.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 low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lebanon, OR
- Average high temperature in December: 45.3°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (45.3°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in December
Lebanon, OR
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in December
Lebanon, OR
- Average wind speed in December: 5mph
The windiest months (with the highest average wind speed) are January and March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in December
Lebanon, OR
- Average humidity in December: 86%
The months with the highest relative humidity are January, February, March and December (86%).
The month with the lowest relative humidity is August (66%).
Average rainfall in December
Lebanon, OR
- Average rainfall in December: 4.41"
The wettest month (with the highest rainfall) is December (4.41").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Lebanon, OR
- Average rainfall days in December: 18 days
The month with the highest number of rainy days is March (20.1 days).
The months with the least rainy days are July and August (3.8 days).
Average snowfall in December
Lebanon, OR
- Average snowfall in December: 0.31"
The month with the highest snowfall is February (2.13").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Lebanon, OR
- Average snowfall days in December: 0.7 days
The month with the highest number of snowfall days is February (2.5 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
Lebanon, 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: 4h and 18min
The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Lebanon, OR
- Average sunshine days in December: 11.6 days
The month with the most sunshine days is July (25.6 days).
The month with the least sunshine days is March (9.1 days).
Average UV index in December
Lebanon, 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
Lebanon, OR
- Average cloud cover in December: 56
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Lebanon, OR
- Average visibility in December: 5mi
The months with the highest visibility are July, August and September (6mi).
The month with the lowest visibility is February (4mi).
