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
As November transitions into December, Glen Rock sees a gentle drop in the average high-temperature, transitioning from a cool 51.1°F (10.6°C) to an icy 42.3°F (5.7°C). Glen Rock witnesses a consistent average low-temperature of 30.7°F (-0.7°C) throughout December.Humidity
The average relative humidity in December is 79%.Rainfall
In Glen Rock, Pennsylvania, during December, the rain falls for 9.2 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Glen Rock, during the entire year, the rain falls for 145.3 days and collects up to 24.88" (632mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Glen Rock, in December, snow falls for 2.9 days, with typically accumulated 1.42" (36mm) of snow. Throughout the year, in Glen Rock, there are 19.2 snowfall days, and 10.59" (269mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:09 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:52 pm EST.
Sunshine
In December, the average sunshine in Glen Rock is 5h.UV index
The months with the lowest UV index in Glen Rock are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In December, an average UV index of 2 transforms into the following instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
Is December cold in Glen Rock?
What is the average humidity in December in Glen Rock?
How much does it rain in Glen Rock in December?
How many days does it snow in December in Glen Rock?
What is the month with the shortest days in Glen Rock?
What is the average length of the day in December in Glen Rock?
What time are sunrise and sunset in December in Glen Rock?
How long on average sun shines in December in Glen Rock?
What are the months with the lowest UV index in Glen Rock?
How high is the UV index in December in Glen Rock?
Average temperature in December
Glen Rock, PA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 30.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in December
Glen Rock, PA
- Average pressure in December: 30.11"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
Glen Rock, PA
- Average wind speed in December: 8.2mph
The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Glen Rock, PA
- Average humidity in December: 79%
The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are January, March, April and November (76%).
Average rainfall in December
Glen Rock, PA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is August (3.03").
The driest month (with the least rainfall) is February (1.38").
Average rainfall days in December
Glen Rock, PA
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.5 days).
Average snowfall in December
Glen Rock, PA
- Average snowfall in December: 1.42"
The month with the highest snowfall is March (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Glen Rock, PA
- Average snowfall days in December: 2.9 days
The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Glen Rock, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
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 42min).
Average sunshine days in December
Glen Rock, PA
- Average sunshine days in December: 19 days
The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in December
Glen Rock, PA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Glen Rock, PA
- Average cloud cover in December: 46
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Glen Rock, 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).
Glen Rock, Pennsylvania, USA
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