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 December begins, there is a decrease in the average high-temperature, falling from a fresh 51.4°F (10.8°C) in November to a cold 41.9°F (5.5°C). Nighttime temperature lowers to an average of 30.9°F (-0.6°C) in December.Humidity
In Mechanics Valley, the average relative humidity in December is 78%.Rainfall
In Mechanics Valley, during December, the rain falls for 10.9 days and regularly aggregates up to 2.76" (70mm) of precipitation. In Mechanics Valley, during the entire year, the rain falls for 158.6 days and collects up to 28.31" (719mm) of precipitation.Snowfall
Months with snowfall in Mechanics Valley, Pennsylvania, are January through May, October through December. In Mechanics Valley, Pennsylvania, in December, during 4.1 snowfall days, 2.13" (54mm) of snow is typically accumulated. In Mechanics Valley, during the entire year, snow falls for 24.6 days and aggregates up to 10.24" (260mm) of snow.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 7:04 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:44 pm EST.
Sunshine
In Mechanics Valley, the average sunshine in December 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 Mechanics Valley. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. To guard against the harmful effects of the Sun, minimize exposure during midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
How cold is it in Mechanics Valley in December?
What is the average humidity in December in Mechanics Valley?
How many days does it rain in December in Mechanics Valley?
How many days does it snow in December in Mechanics Valley?
What is the month with the shortest days in Mechanics Valley?
What is the average length of the day in December in Mechanics Valley?
When are sunrise and sunset in December in Mechanics Valley?
How long on average sun shines in December in Mechanics Valley?
When is the lowest UV index in Mechanics Valley?
What is the UV index reading in December in Mechanics Valley?
Average temperature in December
Mechanics Valley, PA
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.6°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
Mechanics Valley, 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
Mechanics Valley, PA
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Mechanics Valley, PA
- Average humidity in December: 78%
The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Mechanics Valley, PA
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is July (2.87").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days in December
Mechanics Valley, PA
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in December
Mechanics Valley, PA
- Average snowfall in December: 2.13"
The month with the highest snowfall is March (2.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mechanics Valley, PA
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mechanics Valley, 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 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Mechanics Valley, PA
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (11 days).
Average UV index in December
Mechanics Valley, 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
Mechanics Valley, PA
- Average cloud cover in December: 48
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Mechanics Valley, 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).
Mechanics Valley, Pennsylvania, USA
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