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
In December, the average high-temperature goes from a chilly 48.4°F (9.1°C) in November to a cold 37.8°F (3.2°C). In Port Jefferson, the average nighttime temperature during December is a subzero cold 27.5°F (-2.5°C).Humidity
January, February and December, with an average relative humidity of 83%, are the most humid months in Port Jefferson.Rainfall
In Port Jefferson, Ohio, in December, it is raining for 7 days, with typically 0.55" (14mm) of accumulated precipitation. Throughout the year, there are 111.7 rainfall days, and 8.58" (218mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Port Jefferson, Ohio. In December, in Port Jefferson, it is snowing for 6.1 days. Throughout December, 0.47" (12mm) of snow is accumulated. In Port Jefferson, during the entire year, snow falls for 27.1 days and aggregates up to 2.8" (71mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Port Jefferson, Ohio.On the first day of December, sunrise is at 7:40 am and sunset at 5:10 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 5:20 pm EST.
Sunshine
In December, the average sunshine is 3.9h.UV index
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
Is December cold in Port Jefferson?
What is the most humid month in Port Jefferson?
What is the average humidity in December in Port Jefferson?
How many days does it rain in December in Port Jefferson?
How many days does it snow in December in Port Jefferson?
What is the month with the shortest days in Port Jefferson?
How many hours of daylight does Port Jefferson have in December?
When are sunrise and sunset in December in Port Jefferson?
How many hours of sunshine does Port Jefferson have in December?
What are the months with the lowest UV index in Port Jefferson?
How high is the UV index in December in Port Jefferson?
Average temperature in December
Port Jefferson, OH
- Average high temperature in December: 37.8°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Port Jefferson, OH
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Port Jefferson, OH
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Port Jefferson, OH
- Average humidity in December: 83%
The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Port Jefferson, OH
- Average rainfall in December: 0.55"
The wettest months (with the highest rainfall) are May and June (1.06").
The driest month (with the least rainfall) is November (0.47").
Average rainfall days in December
Port Jefferson, OH
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is February (5 days).
Average snowfall in December
Port Jefferson, OH
- Average snowfall in December: 0.47"
The month with the highest snowfall is February (0.79").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Port Jefferson, OH
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Port Jefferson, OH
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Port Jefferson, OH
- Average sunshine days in December: 21 days
The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (13.6 days).
Average UV index in December
Port Jefferson, OH
- 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, October, November and December (UV index 2).
Average cloud cover in December
Port Jefferson, OH
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Port Jefferson, OH
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are August and September (5mi).
Port Jefferson, Ohio, USA
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