Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
In Forest Grove, the lowest average temperatures are observed in December, with a high of 43°F (6.1°C) and a low of 33.1°F (0.6°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 88%.Rainfall
In Forest Grove, in December, it is raining for 19.4 days, with typically 5.39" (137mm) of accumulated precipitation. In Forest Grove, during the entire year, the rain falls for 183.5 days and collects up to 34.45" (875mm) of precipitation.Snowfall
Months with snowfall in Forest Grove are January through March, November and December. In Forest Grove, in December, during 0.7 snowfall days, 0.43" (11mm) of snow is typically accumulated. In Forest Grove, during the entire year, snow falls for 7.1 days and aggregates up to 4.69" (119mm) of snow.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:33 am and sunset at 4:30 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:39 pm PST.
Sunshine
The average sunshine in December is 3.6h.UV index
In December, the average daily maximum UV index in Forest Grove is 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. To guard against the harmful effects of the Sun, minimize exposure during midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is it in December?
What are the most humid months?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Forest Grove have in December?
What time are sunrise and sunset in December in Forest Grove?
How long on average sun shines in December?
What is the UV index reading in December?
Average temperature in December
Forest Grove, OR
- Average high temperature in December: 43°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in December
Forest Grove, 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 (30.01"Hg).
Average wind speed in December
Forest Grove, OR
- Average wind speed in December: 4.5mph
The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Forest Grove, OR
- Average humidity in December: 88%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is August (69%).
Average rainfall in December
Forest Grove, OR
- Average rainfall in December: 5.39"
The wettest month (with the highest rainfall) is January (5.47").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in December
Forest Grove, OR
- Average rainfall days in December: 19.4 days
The month with the highest number of rainy days is March (21.4 days).
The month with the least rainy days is August (6.2 days).
Average snowfall in December
Forest Grove, OR
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Forest Grove, OR
- Average snowfall days in December: 0.7 days
The month with the highest number of snowfall days is February (2.9 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
Forest Grove, OR
- Average daylight in December: 8h and 5min
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 4min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 3h and 30min).
Average sunshine days in December
Forest Grove, OR
- Average sunshine days in December: 10.1 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is March (7.6 days).
Average UV index in December
Forest Grove, 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 November (UV index 1).
Average cloud cover in December
Forest Grove, OR
- Average cloud cover in December: 64
The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Forest Grove, OR
- Average visibility in December: 4mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Forest Grove, Oregon, USA
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