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
The arrival of December corresponds with a light shift in temperature, down from a fresh 52.7°F (11.5°C) in November to a frosty 44.1°F (6.7°C). An average low-temperature of 32.9°F (0.5°C) is noted during the nights in December in Brookhaven.Humidity
The months with the highest humidity are February, October and December, with an average relative humidity of 77%.Rainfall
In December, in Brookhaven, the rain falls for 8.7 days. Throughout December, 2.32" (59mm) of precipitation is accumulated. Throughout the year, in Brookhaven, there are 148.4 rainfall days, and 25.94" (659mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. In Brookhaven, Pennsylvania, during December, snow falls for 1.5 days and regularly aggregates up to 0.91" (23mm) of snow. Throughout the year, in Brookhaven, there are 12.6 snowfall days, and 7.28" (185mm) of snow is accumulated.Daylight
The month with the shortest days in Brookhaven is December, with an average of 9h and 24min of daylight.On the first day of December in Brookhaven, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:46 pm EST.
Sunshine
The average sunshine in December in Brookhaven is 5.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
How cold is it in Brookhaven in December?
What are the most humid months in Brookhaven?
What is the average humidity in December in Brookhaven?
How many days does it rain in December in Brookhaven?
How much does it snow in Brookhaven in December?
What is the month with the shortest days in Brookhaven?
What is the average length of the day in December in Brookhaven?
When is the sunrise / sunset in December in Brookhaven?
How long on average sun shines in December in Brookhaven?
When is the lowest UV index in Brookhaven?
How high is the UV index in December in Brookhaven?
Average temperature in December
Brookhaven, PA
- Average high temperature in December: 44.1°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Brookhaven, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Brookhaven, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Brookhaven, PA
- Average humidity in December: 77%
The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Brookhaven, PA
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.61").
Average rainfall days in December
Brookhaven, PA
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in December
Brookhaven, PA
- Average snowfall in December: 0.91"
The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Brookhaven, PA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (3.8 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
Brookhaven, PA
- 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: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Brookhaven, PA
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in December
Brookhaven, PA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Brookhaven, PA
- Average cloud cover in December: 45
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Brookhaven, PA
- 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).
Brookhaven, Pennsylvania, USA
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