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
Arrival of December comes with a reduction in the average high-temperature, falling from a frosty 45.9°F (7.7°C) in November to a wintry 36.5°F (2.5°C). During December, the average low-temperature in Upper Lehigh is a subzero cold 25.5°F (-3.6°C).Humidity
The months with the highest humidity in Upper Lehigh are February and December, with an average relative humidity of 84%.Rainfall
In Upper Lehigh, in December, during 11 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. Throughout the year, in Upper Lehigh, there are 163.6 rainfall days, and 35" (889mm) of precipitation is accumulated.Snowfall
Months with snowfall in Upper Lehigh are January through May, October through December. In December, it is snowing for 10.7 days. Throughout December, 5.87" (149mm) of snow is accumulated. In Upper Lehigh, during the entire year, snow falls for 60.9 days and aggregates up to 38.9" (988mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:09 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:45 pm EST.
Sunshine
In Upper Lehigh, the average sunshine in December is 3.8h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 1 in December transforms into the following instructions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. When the Sun is at its strongest around midday, find shade and limit exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
How cold is it in Upper Lehigh in December?
What is the most humid month in Upper Lehigh?
What is the average humidity in December in Upper Lehigh?
How many days does it rain in December in Upper Lehigh?
How many days does it snow in December in Upper Lehigh?
What is the month with the shortest days in Upper Lehigh?
What is the average length of the day in December in Upper Lehigh?
What time are sunrise and sunset in December in Upper Lehigh?
How long on average sun shines in December in Upper Lehigh?
When is the lowest UV index in Upper Lehigh?
What is the UV index reading in December in Upper Lehigh?
Average temperature in December
Upper Lehigh, PA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 25.5°F
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in December
Upper Lehigh, 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
Upper Lehigh, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Upper Lehigh, 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 (78%).
Average rainfall in December
Upper Lehigh, PA
- Average rainfall in December: 2.95"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is September (2.13").
Average rainfall days in December
Upper Lehigh, PA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is May (19.4 days).
The month with the least rainy days is January (7 days).
Average snowfall in December
Upper Lehigh, PA
- Average snowfall in December: 5.87"
The month with the highest snowfall is February (8.62").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Upper Lehigh, PA
- Average snowfall days in December: 10.7 days
The month with the highest number of snowfall days is January (14.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Upper Lehigh, 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: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in December
Upper Lehigh, PA
- Average sunshine days in December: 13.2 days
The month with the most sunshine days is November (15.6 days).
The month with the least sunshine days is May (9.2 days).
Average UV index in December
Upper Lehigh, 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
Upper Lehigh, PA
- Average cloud cover in December: 61
The months with the most cloud cover are February and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 38).
Average visibility in December
Upper Lehigh, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Upper Lehigh, Pennsylvania, USA
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