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 comes with a drop in the average high-temperature, falling from November's frosty 47.1°F (8.4°C) to a wintry 37.6°F (3.1°C). During the month of December, an average temperature of 26.8°F (-2.9°C) is noted during the nights.Humidity
In December, the average relative humidity is 86%.Rainfall
In West Middlesex, during December, the rain falls for 12.7 days and regularly aggregates up to 2.72" (69mm) of precipitation. In West Middlesex, during the entire year, the rain falls for 182.1 days and collects up to 34.8" (884mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In West Middlesex, in December, during 15.5 snowfall days, 5.98" (152mm) of snow is typically accumulated. In West Middlesex, during the entire year, snow falls for 76.4 days and aggregates up to 31.69" (805mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:28 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 5:03 pm EST.
Sunshine
In West Middlesex, the average sunshine in December is 2.9h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In December, a daily maximum UV index of 1 leads to the following instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does West Middlesex have in December?
When are sunrise and sunset in December?
How many hours of sunshine does West Middlesex have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
West Middlesex, PA
- Average high temperature in December: 37.6°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in December
West Middlesex, 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
West Middlesex, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is July (5mph).
Average humidity in December
West Middlesex, PA
- Average humidity in December: 86%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are May, July and August (78%).
Average rainfall in December
West Middlesex, PA
- Average rainfall in December: 2.72"
The wettest month (with the highest rainfall) is June (3.66").
The driest month (with the least rainfall) is September (2.2").
Average rainfall days in December
West Middlesex, PA
- Average rainfall days in December: 12.7 days
The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in December
West Middlesex, PA
- Average snowfall in December: 5.98"
The month with the highest snowfall is January (8.62").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
West Middlesex, PA
- Average snowfall days in December: 15.5 days
The month with the highest number of snowfall days is January (20.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
West Middlesex, 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: 2h 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: 2h and 30min).
Average sunshine days in December
West Middlesex, PA
- Average sunshine days in December: 7.6 days
The month with the most sunshine days is September (12.7 days).
The month with the least sunshine days is February (6 days).
Average UV index in December
West Middlesex, 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
West Middlesex, PA
- Average cloud cover in December: 69
The month with the most cloud cover is January (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in December
West Middlesex, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
West Middlesex, Pennsylvania, USA
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