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
With average temperatures fluctuating between a high of 42.3°F (5.7°C) and a low of 32.7°F (0.4°C), December stands out as the coldest month.Humidity
The months with the highest humidity in Rainier are January, February, November and December, with an average relative humidity of 88%.Rainfall
In Rainier, Oregon, during December, the rain falls for 18.5 days and regularly aggregates up to 3.58" (91mm) of precipitation. In Rainier, during the entire year, the rain falls for 175.5 days and collects up to 25.83" (656mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Rainier. In Rainier, during December, snow falls for 0.9 days and regularly aggregates up to 0.24" (6mm) of snow. Throughout the year, there are 6.7 snowfall days, and 3.54" (90mm) of snow is accumulated.Daylight
December has the shortest days of the year in Rainier, with an average of 8h and 42min of daylight.On the first day of December in Rainier, Oregon, sunrise is at 7:34 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 4:36 pm PST.
Sunshine
January, February and December, with an average of 3.5h of sunshine, are months with the least sunshine.UV index
The average daily maximum UV index in December in Rainier is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: In December, a daily UV index of 2 turns into the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What part of the year is the coldest in Rainier?
How cold does it get in Rainier in December?
What are the most humid months in Rainier?
What is the average humidity in December in Rainier?
How much does it rain in Rainier in December?
How much does it snow in Rainier in December?
What is the month with the shortest days in Rainier?
What is the average length of the day in December in Rainier?
When are sunrise and sunset in December in Rainier?
What is the month with the least sunshine in Rainier?
How long on average sun shines in December in Rainier?
How high is the UV index in December in Rainier?
Average temperature in December
Rainier, OR
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure in December
Rainier, 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
Rainier, OR
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in December
Rainier, OR
- Average humidity in December: 88%
The months with the highest relative humidity are January, February, November and December (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Rainier, OR
- Average rainfall in December: 3.58"
The wettest month (with the highest rainfall) is January (3.9").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in December
Rainier, OR
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is July (6.1 days).
Average snowfall in December
Rainier, OR
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Rainier, OR
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Rainier, 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 3min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 30min).
Average sunshine days in December
Rainier, OR
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is July (22 days).
The month with the least sunshine days is March (8.9 days).
Average UV index in December
Rainier, 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
Rainier, OR
- Average cloud cover in December: 64
The months with the most cloud cover are February and March (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in December
Rainier, OR
- Average visibility in December: 4mi
The month with the highest visibility is August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (4mi).
Rainier, Oregon, USA
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