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 sea temperature 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
The commencement of December in Portsmouth includes a gentle temperature shift, with the average high-temperature dropping a bit from a mild 58.3°F (14.6°C) in November to a cool 51.4°F (10.8°C). Portsmouth records an average temperature drop to a cold 40.5°F (4.7°C) in December.Humidity
In December, the average relative humidity is 77%.Rainfall
In December, the rain falls for 10.8 days. Throughout December, 1.46" (37mm) of precipitation is accumulated. Throughout the year, in Portsmouth, there are 151.9 rainfall days, and 20.35" (517mm) of precipitation is accumulated.Snowfall
Months with snowfall in Portsmouth are January through March, November and December. In Portsmouth, during December, snow falls for 0.9 days and regularly aggregates up to 0.24" (6mm) of snow. Throughout the year, in Portsmouth, Virginia, there are 5.3 snowfall days, and 1.18" (30mm) of snow is accumulated.Ocean temperature
In December, the average ocean temperature in Portsmouth is 52.7°F (11.5°C).Note: Staying in 52.7°F (11.5°C) waters for just a few moments at 55.4°F (13°C) can be harrowing, and below 50°F (10°C) poses breathing and cold shock risks, depending on individual tolerance.
Daylight
December has the shortest days of the year, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 6:59 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:59 pm EST.
Sunshine
The average sunshine in December is 5.5h.UV index
In December, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: An average UV index of 3 in December transforms into this advice:
Undertake precautions - It is suggested to shield oneself from sunburn. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
What is the usual temperature for Portsmouth in December?
What is the average humidity in December in Portsmouth?
How much does it rain in Portsmouth in December?
How much does it snow in Portsmouth in December?
How cold is the water in December in Portsmouth?
What is the month with the shortest days in Portsmouth?
How many hours of daylight does Portsmouth have in December?
When is the sunrise / sunset in December in Portsmouth?
How long on average sun shines in December in Portsmouth?
What is the UV index reading in December in Portsmouth?
Average temperature in December
Portsmouth, VA
- Average high temperature in December: 51.4°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (45.9°F).
- Average low temperature in December: 40.5°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (34.7°F).
Average pressure in December
Portsmouth, VA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Portsmouth, VA
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in December
Portsmouth, VA
- Average humidity in December: 77%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July and November (74%).
Average rainfall in December
Portsmouth, VA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is August (2.52").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in December
Portsmouth, VA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in December
Portsmouth, VA
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Portsmouth, VA
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is January (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in December
Portsmouth, VA
- Average sea temperature in December: 52.7°F
The best month for swimming (with the highest average sea temperature) is August (80°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).
Average daylight in December /
Average sunshine in December
Portsmouth, VA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).
Average sunshine days in December
Portsmouth, VA
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is August (10.8 days).
Average UV index in December
Portsmouth, VA
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in December
Portsmouth, VA
- Average cloud cover in December: 41
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in December
Portsmouth, VA
- 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, Virginia, USA
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