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
Waterloo notes the coldest temperatures in December, with a high average of 45.3°F (7.4°C) and a low of 34.2°F (1.2°C).Humidity
January through March and December, with an average relative humidity of 86%, are the most humid months.Rainfall
The month with the most rainfall is December, when the rain falls for 18 days and typically aggregates up to 4.41" (112mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Waterloo, Oregon, during December, snow falls for 0.7 days and regularly aggregates up to 0.31" (8mm) of snow. In Waterloo, during the entire year, snow falls for 5.6 days and aggregates up to 4.09" (104mm) of snow.Daylight
With an average of 8h and 54min of daylight, December has the shortest days of the year in Waterloo.On the first day of the month, sunrise is at 7:28 am and sunset at 4:32 pm. On the last day of December, in Waterloo, sunrise is at 7:47 am and sunset at 4:41 pm PST.
Sunshine
In Waterloo, 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 in Waterloo. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 2 suggests these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
What are the coldest months in Waterloo?
What is the average December temperature in Waterloo?
What is the most humid month in Waterloo?
What is the average humidity in December in Waterloo?
What is the wettest month in Waterloo?
How much does it rain in Waterloo in December?
How much does it snow in Waterloo in December?
What is the month with the shortest days in Waterloo?
What is the average length of the day in December in Waterloo?
When are sunrise and sunset in December in Waterloo?
How long on average sun shines in December in Waterloo?
What are the months with the lowest UV index in Waterloo?
What is the UV index intensity in December in Waterloo?
Average temperature in December
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, OR
- Average daylight in December: 8h and 5min
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 2min
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
Waterloo, 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
Waterloo, 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
Waterloo, 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
Waterloo, 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).
Waterloo, Oregon, USA
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