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
Knox's progression into December involves a drop in the average high-temperature, receding from a chilly 45.9°F (7.7°C) in November to a wintry 36.5°F (2.5°C). During the month of December, Knox experiences a steady low-temperature average of 25.7°F (-3.5°C).Humidity
The average relative humidity in December is 86%.Rainfall
In Knox, during December, the rain falls for 12.5 days and regularly aggregates up to 1.97" (50mm) of precipitation. In Knox, during the entire year, the rain falls for 169.8 days and collects up to 27.36" (695mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 16.9 days. Throughout December, 5" (127mm) of snow is accumulated. In Knox, during the entire year, snow falls for 80.5 days and aggregates up to 26.02" (661mm) 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 7:24 am and sunset at 4:49 pm. On the last day of December, sunrise is at 7:43 am and sunset at 4:59 pm EST.
Sunshine
In Knox, Pennsylvania, the average sunshine in December is 2.7h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: In December, a daily maximum UV index of 1 leads to the following instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Knox have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Knox, PA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in December
Knox, 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
Knox, PA
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Knox, PA
- Average humidity in December: 86%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is July (78%).
Average rainfall in December
Knox, PA
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is April (3.15").
The driest month (with the least rainfall) is August (1.69").
Average rainfall days in December
Knox, PA
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Knox, PA
- Average snowfall in December: 5"
The month with the highest snowfall is January (7.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Knox, PA
- Average snowfall days in December: 16.9 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Knox, 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: 2h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in December
Knox, PA
- Average sunshine days in December: 6.6 days
The month with the most sunshine days is September (14 days).
The month with the least sunshine days is February (5.7 days).
Average UV index in December
Knox, 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
Knox, PA
- Average cloud cover in December: 72
The month with the most cloud cover is January (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in December
Knox, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
Knox, Pennsylvania, USA
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