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 the onset of December, Portsmouth's climate undergoes a slight change as the average high-temperature moves from a cool 51.1°F (10.6°C) in November to a wintry 42.4°F (5.8°C). In Portsmouth, the expected average low-temperature for December is a still cold 33.1°F (0.6°C).Humidity
In Portsmouth, the average relative humidity in December is 75%.Rainfall
In Portsmouth, in December, during 11.5 rainfall days, 3.23" (82mm) of precipitation is typically accumulated. In Portsmouth, during the entire year, the rain falls for 148.1 days and collects up to 29.65" (753mm) of precipitation.Snowfall
Months with snowfall are January through March, May, November and December. In Portsmouth, during December, snow falls for 3.8 days and regularly aggregates up to 1.38" (35mm) of snow. In Portsmouth, during the entire year, snow falls for 22.9 days and aggregates up to 8.78" (223mm) of snow.Daylight
The month with the shortest days in Portsmouth, Rhode Island, is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:52 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:11 am and sunset at 4:24 pm EST.
Sunshine
The average sunshine in December is 4.9h.UV index
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. 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. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
How cold is December in Portsmouth?
What is the average humidity in December in Portsmouth?
How many days does it rain in December in Portsmouth?
How much does it snow in Portsmouth in December?
What is the month with the shortest days in Portsmouth?
How many hours of daylight does Portsmouth have in December?
When are sunrise and sunset in December in Portsmouth?
How long on average sun shines in December in Portsmouth?
What are the months with the lowest UV index in Portsmouth?
What is the UV index intensity in December in Portsmouth?
Average temperature in December
Portsmouth, RI
- Average high temperature in December: 42.4°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in December
Portsmouth, RI
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Portsmouth, RI
- Average wind speed in December: 11.6mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).
Average humidity in December
Portsmouth, RI
- Average humidity in December: 75%
The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).
Average rainfall in December
Portsmouth, RI
- Average rainfall in December: 3.23"
The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is September (1.42").
Average rainfall days in December
Portsmouth, RI
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is April (15.6 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Portsmouth, RI
- Average snowfall in December: 1.38"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in December
Portsmouth, RI
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (6.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Portsmouth, RI
- 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 5min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Portsmouth, RI
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is April (12.3 days).
Average UV index in December
Portsmouth, RI
- 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 and December (UV index 2).
Average cloud cover in December
Portsmouth, RI
- Average cloud cover in December: 47
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Portsmouth, RI
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Portsmouth, Rhode Island, USA
Weather forecast for your location
2. Allow the app to use your location
