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 brings a drop in Westport's average high-temperature, falling from a frosty 45°F (7.2°C) in November to a wintry 35.1°F (1.7°C). Westport encounters an average low-temperature of 25.2°F (-3.8°C) during December nights.Humidity
The months with the highest humidity are February and December, with an average relative humidity of 86%.Rainfall
In December, the rain falls for 13.1 days. Throughout December, 2.87" (73mm) of precipitation is accumulated. In Westport, during the entire year, the rain falls for 179.8 days and collects up to 32.36" (822mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Westport, during December, snow falls for 13.7 days and regularly aggregates up to 5.35" (136mm) of snow. Throughout the year, there are 65.4 snowfall days, and 28.15" (715mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:18 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:37 am and sunset at 4:52 pm EST.
Sunshine
January and December, with an average of 3.2h of sunshine, are months with the least sunshine.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 1 in December suggests the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the most humid month?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What are the months with the least sunshine?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Westport, PA
- Average high temperature in December: 35.1°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 25.2°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in December
Westport, 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
Westport, PA
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Westport, PA
- Average humidity in December: 86%
The months with the highest relative humidity are February and December (86%).
The month with the lowest relative humidity is July (77%).
Average rainfall in December
Westport, PA
- Average rainfall in December: 2.87"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is November (2.2").
Average rainfall days in December
Westport, PA
- Average rainfall days in December: 13.1 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is February (11.1 days).
Average snowfall in December
Westport, PA
- Average snowfall in December: 5.35"
The month with the highest snowfall is January (7.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Westport, PA
- Average snowfall days in December: 13.7 days
The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Westport, PA
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are January and December (Average sunshine: 3h and 12min).
Average sunshine days in December
Westport, PA
- Average sunshine days in December: 8.8 days
The month with the most sunshine days is September (14.9 days).
The month with the least sunshine days is February (7.7 days).
Average UV index in December
Westport, PA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Westport, PA
- Average cloud cover in December: 67
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in December
Westport, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, August, October and November (5mi).
The months with the lowest visibility are January, February, September and December (4mi).
Westport, Pennsylvania, USA
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