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
December implies a gentle temperature shift, with average high-temperatures reducing from November's fresh 51.8°F (11°C) to a frosty 42.8°F (6°C). In the month of December, the temperature in Westbury generally rests at an average low of 31.1°F (-0.5°C).Humidity
February, October and December, with an average relative humidity of 78%, are the most humid months.Rainfall
The month with the most rainfall in Westbury is December, when the rain falls for 5.8 days and typically aggregates up to 0.75" (19mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. In Westbury, during December, snow falls for 1.7 days and regularly aggregates up to 0.28" (7mm) of snow. In Westbury, during the entire year, snow falls for 12.6 days and aggregates up to 1.73" (44mm) of snow.Daylight
The month with the shortest days in Westbury, Pennsylvania, is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:44 pm EST.
Sunshine
In December, the average sunshine is 5h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Westbury. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 2 during December translates into the following guidance:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Frequently asked questions
How cold is December in Westbury?
What is the most humid month in Westbury?
What is the average humidity in December in Westbury?
What is the rainiest month in Westbury?
How much does it rain in Westbury in December?
How much does it snow in Westbury in December?
What is the month with the shortest days in Westbury?
How many hours of daylight does Westbury have in December?
When is the sunrise / sunset in December in Westbury?
How long on average sun shines in December in Westbury?
When is the lowest UV index in Westbury?
What is the UV index reading in December in Westbury?
Average temperature in December
Westbury, PA
- Average high temperature in December: 42.8°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 (36.9°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Westbury, 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
Westbury, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Westbury, PA
- Average humidity in December: 78%
The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April, July and August (72%).
Average rainfall in December
Westbury, PA
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is December (0.75").
The driest month (with the least rainfall) is September (0.2").
Average rainfall days in December
Westbury, PA
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is July (10.3 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in December
Westbury, PA
- Average snowfall in December: 0.28"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Westbury, PA
- Average snowfall days in December: 1.7 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Westbury, 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 0min
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 48min).
Average sunshine days in December
Westbury, PA
- Average sunshine days in December: 23.2 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (17.4 days).
Average UV index in December
Westbury, 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, March, November and December (UV index 2).
Average cloud cover in December
Westbury, PA
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Westbury, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Westbury, Pennsylvania, USA
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