December weather forecastGallagher, PA
December
Weather in December
The first month of the winter, December, is also an icy month in Gallagher, Pennsylvania, with an average temperature fluctuating between 36.7°F (2.6°C) and 25.9°F (-3.4°C).Temperature
In Gallagher, entering December brings a temperature decrement, reducing from November's chilly 46.2°F (7.9°C) to a cold 36.7°F (2.6°C). December nights in Gallagher cool down to an average low-temperature of 25.9°F (-3.4°C).Humidity
February and December, with an average relative humidity of 84%, are the most humid months.Rainfall
In December, the rain falls for 12.4 days. Throughout December, 2.68" (68mm) of precipitation is accumulated. Throughout the year, there are 174.7 rainfall days, and 32.09" (815mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Gallagher, in December, during 12.2 snowfall days, 4.76" (121mm) of snow is typically accumulated. In Gallagher, during the entire year, snow falls for 56.1 days and aggregates up to 24.84" (631mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Gallagher.On the first day of the month, sunrise is at 7:16 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:35 am and sunset at 4:50 pm EST.
Sunshine
In December, the average sunshine is 3.4h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 1 during December leads to these advisories:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Gallagher, PA
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Gallagher, 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 (29.95"Hg).
Average wind speed in December
Gallagher, PA
- Average wind speed in December: 7mph
The windiest months (with the highest average wind speed) are January and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Gallagher, PA
- Average humidity in December: 84%
The months with the highest relative humidity are February and December (84%).
The months with the lowest relative humidity are April, June and July (77%).
Average rainfall in December
Gallagher, PA
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is April (3.54").
The driest month (with the least rainfall) is November (2.09").
Average rainfall days in December
Gallagher, PA
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (10.3 days).
Average snowfall in December
Gallagher, PA
- Average snowfall in December: 4.76"
The month with the highest snowfall is February (7.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Gallagher, PA
- Average snowfall days in December: 12.2 days
The month with the highest number of snowfall days is January (15.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Gallagher, PA
- Average daylight in December: 9h and 18min
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 24min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Gallagher, PA
- Average sunshine days in December: 10.3 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in December
Gallagher, 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
Gallagher, PA
- Average cloud cover in December: 64
The months with the most cloud cover are January and December (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Gallagher, PA
- Average visibility in December: 4mi
The months with the highest visibility are January, March, April, May, June, July, August, October and November (5mi).
The months with the lowest visibility are February, September and December (4mi).
