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
December's arrival comes with a decrease in the average high-temperature, moving from a frosty 48.4°F (9.1°C) in November to a cold 38.5°F (3.6°C). During the nights in December, Portland experiences a consistent average temperature of 27.3°F (-2.6°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 82%.Rainfall
In Portland, in December, during 9.3 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. Throughout the year, in Portland, there are 135.7 rainfall days, and 23.74" (603mm) of precipitation is accumulated.Snowfall
Months with snowfall in Portland are January through May, October through December. In Portland, in December, during 5.7 snowfall days, 3.35" (85mm) of snow is typically accumulated. Throughout the year, in Portland, there are 33.7 snowfall days, and 16.65" (423mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Portland, Pennsylvania.On the first day of December, sunrise is at 7:06 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:42 pm EST.
Sunshine
The average sunshine in December is 4.5h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
How cold does it get in Portland in December?
What is the most humid month in Portland?
What is the average humidity in December in Portland?
How much does it rain in Portland in December?
How many days does it snow in December in Portland?
What is the month with the shortest days in Portland?
How many hours of daylight does Portland have in December?
When are sunrise and sunset in December in Portland?
How many hours of sunshine does Portland have in December?
When is the lowest UV index in Portland?
What is the UV index reading in December in Portland?
Average temperature in December
Portland, PA
- Average high temperature in December: 38.5°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Portland, PA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Portland, PA
- Average wind speed in December: 7.2mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Portland, PA
- Average humidity in December: 82%
The months with the highest relative humidity are February and December (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Portland, PA
- Average rainfall in December: 2.13"
The wettest month (with the highest rainfall) is July (2.48").
The driest month (with the least rainfall) is September (1.22").
Average rainfall days in December
Portland, PA
- Average rainfall days in December: 9.3 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in December
Portland, PA
- Average snowfall in December: 3.35"
The month with the highest snowfall is March (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Portland, PA
- Average snowfall days in December: 5.7 days
The month with the highest number of snowfall days is February (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Portland, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Portland, PA
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in December
Portland, PA
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Portland, PA
- Average cloud cover in December: 52
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Portland, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Portland, Pennsylvania, USA
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