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 December's arrival, Long Brook's weather changes as the average high-temperature falls from a chilly 46.9°F (8.3°C) in November to a wintry 37°F (2.8°C). During December, Long Brook consistently records a temperature low averaging a subzero cold 27°F (-2.8°C).Humidity
In Long Brook, the average relative humidity in December is 82%.Rainfall
In Long Brook, in December, it is raining for 12.7 days, with typically 1.93" (49mm) of accumulated precipitation. In Long Brook, during the entire year, the rain falls for 168 days and collects up to 27.32" (694mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, in Long Brook, it is snowing for 10 days. Throughout December, 2.95" (75mm) of snow is accumulated. Throughout the year, in Long Brook, there are 48.3 snowfall days, and 17.68" (449mm) of snow is accumulated.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 7:13 am and sunset at 4:37 pm. On the last day of December, in Long Brook, sunrise is at 7:31 am and sunset at 4:46 pm EST.
Sunshine
In Long Brook, Pennsylvania, the average sunshine in December is 4.1h.UV index
The months with the lowest UV index in Long Brook are January through March, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 2 in December leads to these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Long Brook in December?
What is the average humidity in December in Long Brook?
How much does it rain in Long Brook in December?
How many days does it snow in December in Long Brook?
What is the month with the shortest days in Long Brook?
How many hours of daylight does Long Brook have in December?
When are sunrise and sunset in December in Long Brook?
How long on average sun shines in December in Long Brook?
When is the lowest UV index in Long Brook?
What is the UV index reading in December in Long Brook?
Average temperature in December
Long Brook, PA
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in December: 27°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in December
Long Brook, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Long Brook, PA
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Long Brook, PA
- Average humidity in December: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).
Average rainfall in December
Long Brook, PA
- Average rainfall in December: 1.93"
The wettest month (with the highest rainfall) is April (2.83").
The driest month (with the least rainfall) is November (1.77").
Average rainfall days in December
Long Brook, PA
- Average rainfall days in December: 12.7 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (9.7 days).
Average snowfall in December
Long Brook, PA
- Average snowfall in December: 2.95"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Long Brook, PA
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Long Brook, PA
- 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 1min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).
Average sunshine days in December
Long Brook, PA
- Average sunshine days in December: 13.4 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (10 days).
Average UV index in December
Long Brook, PA
- Average UV index in December: 2
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Long Brook, PA
- Average cloud cover in December: 58
The months with the most cloud cover are January, February and December (Cloud cover 58).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Long Brook, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Long Brook, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location