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 brings a drop in Portland's average high-temperature, falling from a frosty 49.3°F (9.6°C) in November to a wintry 39.7°F (4.3°C). During the nights in December, Portland experiences a consistent average temperature of 29.1°F (-1.6°C).Humidity
The average relative humidity in December in Portland is 77%.Rainfall
The month with the most rainfall is December, when the rain falls for 11.9 days and typically aggregates up to 3.66" (93mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Portland, in December, during 5.3 snowfall days, 2.28" (58mm) of snow is typically accumulated. In Portland, during the entire year, snow falls for 29.4 days and aggregates up to 14.76" (375mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of December, in Portland, Connecticut, sunrise is at 7:17 am and sunset at 4:30 pm EST.
Sunshine
The average sunshine in December is 4.7h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Portland. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
How cold does it get in Portland in December?
What is the average humidity in December in Portland?
What is the rainiest month in Portland?
How much does it rain in Portland in December?
How much does it snow in Portland in December?
What is the month with the shortest days in Portland?
What is the average length of the day in December in Portland?
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 intensity in December in Portland?
Average temperature in December
Portland, CT
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in December
Portland, CT
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Portland, CT
- Average wind speed in December: 8mph
The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
Portland, CT
- Average humidity in December: 77%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Portland, CT
- Average rainfall in December: 3.66"
The wettest month (with the highest rainfall) is December (3.66").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in December
Portland, CT
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in December
Portland, CT
- Average snowfall in December: 2.28"
The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Portland, CT
- Average snowfall days in December: 5.3 days
The month with the highest number of snowfall days is February (8.3 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, CT
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 4h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Portland, CT
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in December
Portland, CT
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Portland, CT
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Portland, CT
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, August, September, October, November and December (6mi).
The months with the lowest visibility are February, May, June and July (5mi).
Portland, Connecticut, USA
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