December weather forecastCarlisle, PA
December
Weather in December
December weather in Carlisle ushers in the winter season, with temperatures plunging down from 29.5°F (-1.4°C) to 41°F (5°C). Following the pattern of November, the cooling trend continues, bringing along with it an increased incidence of snowfall. In the oncoming January, similar conditions can be expected. Despite the chill, the festive atmosphere brings warmth, celebrating the end of the year in a frosty, winter wonderland.Temperature
The beginning of December involves a decrease in the average high-temperature, transitioning from a cool 50°F (10°C) in November to an icy 41°F (5°C). During December, Carlisle's temperature falls to a steady low-temperature average of 29.5°F (-1.4°C).Humidity
In Carlisle, the average relative humidity in December is 79%.Rainfall
In Carlisle, in December, during 8.1 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 123.7 rainfall days, and 12.09" (307mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Carlisle, in December, during 3.3 snowfall days, 0.51" (13mm) of snow is typically accumulated. In Carlisle, during the entire year, snow falls for 22.3 days and aggregates up to 4.72" (120mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:53 pm EST.
Sunshine
In Carlisle, the average sunshine in December is 4.7h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 2 in December transforms into this advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Experience reduced UV exposure by about half when donning a wide-brim hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Carlisle, PA
- Average high temperature in December: 41°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in December: 29.5°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in December
Carlisle, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Carlisle, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in December
Carlisle, PA
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in December
Carlisle, PA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is May (1.34").
The driest months (with the least rainfall) are January and February (0.75").
Average rainfall days in December
Carlisle, PA
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in December
Carlisle, PA
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Carlisle, PA
- Average snowfall days in December: 3.3 days
The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Carlisle, PA
- Average daylight in December: 9h and 24min
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: 4h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Carlisle, PA
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in December
Carlisle, PA
- Average UV index in December: 2
The months with the highest UV index are May, June and July (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
Carlisle, PA
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Carlisle, 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).
