December weather forecastDuncannon, PA
December
Weather in December
The first month of the winter, December, is also a wintry month in Duncannon, Pennsylvania, with an average temperature ranging between max 40.3°F (4.6°C) and min 28.8°F (-1.8°C).Temperature
With December's arrival, Duncannon sees a decrease in average high-temperatures, moving from a chilly 49.8°F (9.9°C) in November to a wintry 40.3°F (4.6°C). Duncannon witnesses an average low-temperature of 28.8°F (-1.8°C) throughout the month of December.Humidity
The average relative humidity in December is 79%.Rainfall
In Duncannon, during December, the rain falls for 11 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, there are 161.8 rainfall days, and 30.71" (780mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 5.5 days. Throughout December, 2.01" (51mm) of snow is accumulated. In Duncannon, during the entire year, snow falls for 28.8 days and aggregates up to 15.67" (398mm) 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 7:12 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:51 pm EST.
Sunshine
In December, the average sunshine is 4.5h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Duncannon, PA
- Average high temperature in December: 40.3°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 28.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Duncannon, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Duncannon, PA
- Average wind speed in December: 7.2mph
The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Duncannon, PA
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are March and April (75%).
Average rainfall in December
Duncannon, PA
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (2.13").
Average rainfall days in December
Duncannon, PA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is May (18.3 days).
The months with the least rainy days are January and February (8.8 days).
Average snowfall in December
Duncannon, PA
- Average snowfall in December: 2.01"
The month with the highest snowfall is January (4.57").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Duncannon, PA
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Duncannon, PA
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Duncannon, PA
- Average sunshine days in December: 16 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (10.4 days).
Average UV index in December
Duncannon, 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
Duncannon, PA
- Average cloud cover in December: 52
The months with the most cloud cover are February and December (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Duncannon, PA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are January, February, May and September (5mi).
