December weather forecastMcKnightstown, PA
December
Weather in December
December, the first month of the winter in McKnightstown, is also an icy month, with an average temperature varying between 29.8°F (-1.2°C) and 41.5°F (5.3°C).Temperature
The onset of December coincides with a reduction in the average high-temperature, falling from a cool 50.7°F (10.4°C) in November to a wintry 41.5°F (5.3°C). During the December nights, an average temperature of 29.8°F (-1.2°C) is observed.Humidity
In December, the average relative humidity is 79%.Rainfall
In McKnightstown, during December, the rain falls for 7.5 days and regularly aggregates up to 0.87" (22mm) of precipitation. In McKnightstown, during the entire year, the rain falls for 125 days and collects up to 12.13" (308mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In McKnightstown, in December, snow falls for 3.4 days, with typically accumulated 0.83" (21mm) of snow. Throughout the year, there are 20.9 snowfall days, and 4.8" (122mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in McKnightstown.On the first day of December, sunrise is at 7:12 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:54 pm EST.
Sunshine
In McKnightstown, the average sunshine in December is 4.9h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 translates into these guidelines:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Keep in mind! Snow's reflective quality 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
Average temperature in December
McKnightstown, PA
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.6°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in December
McKnightstown, 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
McKnightstown, PA
- Average wind speed in December: 7.6mph
The windiest months (with the highest average wind speed) are January, February and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
McKnightstown, PA
- Average humidity in December: 79%
The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in December
McKnightstown, PA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is July (1.46").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in December
McKnightstown, PA
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (5 days).
Average snowfall in December
McKnightstown, PA
- Average snowfall in December: 0.83"
The month with the highest snowfall is March (1.3").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
McKnightstown, PA
- Average snowfall days in December: 3.4 days
The month with the highest number of snowfall days is February (6.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
McKnightstown, 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 54min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
McKnightstown, PA
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is November (21.6 days).
The month with the least sunshine days is August (13.6 days).
Average UV index in December
McKnightstown, 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, November and December (UV index 2).
Average cloud cover in December
McKnightstown, PA
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
McKnightstown, 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).
