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
With the onset of December, Upper Lehigh experiences a modest temperature adjustment, with the average high-temperature receding from a frosty 45.9°F (7.7°C) in November to a cold 36.5°F (2.5°C). Upper Lehigh, in December, witnesses an average low-temperature of 25.5°F (-3.6°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 84%.Rainfall
In Upper Lehigh, in December, it is raining for 11 days, with typically 2.95" (75mm) of accumulated precipitation. In Upper Lehigh, during the entire year, the rain falls for 163.6 days and collects up to 35" (889mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Upper Lehigh, during December, snow falls for 10.7 days and regularly aggregates up to 5.87" (149mm) of snow. Throughout the year, there are 60.9 snowfall days, and 38.9" (988mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.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, in Upper Lehigh, sunrise is at 7:28 am and sunset at 4:45 pm EST.
Sunshine
In December, the average sunshine in Upper Lehigh is 3.8h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The solar radiation around mid-day is intense; avoid the Sun and stay safe. To cut down UV radiation exposure by about half, sport a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the most humid month?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Upper Lehigh have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Upper Lehigh have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
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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