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 shows a mild decline in the average high-temperature, falling from November's chilly 46.2°F (7.9°C) to a wintry 36.9°F (2.7°C). Llewellyn Corners experiences a nighttime temperature average of 25.9°F (-3.4°C) during December.Humidity
February and December, with an average relative humidity of 84%, are the most humid months.Rainfall
In Llewellyn Corners, during December, the rain falls for 11.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Llewellyn Corners, during the entire year, the rain falls for 142.7 days and collects up to 13.19" (335mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Llewellyn Corners, in December, snow falls for 10 days, with typically accumulated 1.93" (49mm) of snow. In Llewellyn Corners, during the entire year, snow falls for 49.9 days and aggregates up to 9.92" (252mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December in Llewellyn Corners, sunrise is at 7:09 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:44 pm EST.
Sunshine
In December, the average sunshine is 3.9h.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 threat to health from exposure to the Sun's UV radiation for the average person.Note: A typical high UV index of 1 in December suggests the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What are the most humid months?
What is the average humidity in December?
How many days 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 Llewellyn Corners have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Llewellyn Corners have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Llewellyn Corners, PA
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in December
Llewellyn Corners, 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
Llewellyn Corners, PA
- Average wind speed in December: 7.6mph
The windiest months (with the highest average wind speed) are March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Llewellyn Corners, PA
- Average humidity in December: 84%
The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is April (77%).
Average rainfall in December
Llewellyn Corners, PA
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is July (1.5").
The driest month (with the least rainfall) is September (0.71").
Average rainfall days in December
Llewellyn Corners, PA
- Average rainfall days in December: 11.3 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Llewellyn Corners, PA
- Average snowfall in December: 1.93"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Llewellyn Corners, PA
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Llewellyn Corners, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days in December
Llewellyn Corners, PA
- Average sunshine days in December: 13.7 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is February (11.6 days).
Average UV index in December
Llewellyn Corners, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Llewellyn Corners, PA
- Average cloud cover in December: 60
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility in December
Llewellyn Corners, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Llewellyn Corners, Pennsylvania, USA
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