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
The month of December sees the lowest average temperatures, reaching 42.1°F (5.6°C) at the peak and 32.9°F (0.5°C) at the low.Humidity
The average relative humidity in December is 88%.Rainfall
In Grand Rapids, in December, during 19.3 rainfall days, 5.47" (139mm) of precipitation is typically accumulated. In Grand Rapids, during the entire year, the rain falls for 184.4 days and collects up to 36.61" (930mm) of precipitation.Snowfall
Months with snowfall in Grand Rapids are January through April, November and December. In Grand Rapids, during December, snow falls for 1.9 days and regularly aggregates up to 0.63" (16mm) of snow. In Grand Rapids, 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 in Grand Rapids, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:35 am and sunset at 4:30 pm. On the last day of December, in Grand Rapids, Oregon, sunrise is at 7:55 am and sunset at 4:39 pm PST.
Sunshine
In December, the average sunshine in Grand Rapids, Oregon, is 3.4h.UV index
The months with the lowest UV index in Grand Rapids, Oregon, are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What is the coldest time of year in Grand Rapids?
How cold does it get in Grand Rapids in December?
What is the average humidity in December in Grand Rapids?
How much does it rain in Grand Rapids in December?
How many days does it snow in December in Grand Rapids?
What is the month with the shortest days in Grand Rapids?
What is the average length of the day in December in Grand Rapids?
When is the sunrise / sunset in December in Grand Rapids?
How long on average sun shines in December in Grand Rapids?
What is the month with the lowest UV index in Grand Rapids?
What is the UV index reading in December in Grand Rapids?
Average temperature in December
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, OR
- Average daylight in December: 8h and 4min
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 2min
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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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
Grand Rapids, 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).
Grand Rapids, Oregon, USA
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