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
The arrival of December indicates a decrease in the average high-temperature, moving from a frosty 45.9°F (7.7°C) in November to a cold 36.3°F (2.4°C). Chester Hill registers a consistent average low-temperature of 25.9°F (-3.4°C) during December.Humidity
In December, the average relative humidity in Chester Hill is 84%.Rainfall
In Chester Hill, in December, it is raining for 11.4 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, there are 159 rainfall days, and 23.46" (596mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 13.8 days. Throughout December, 4.13" (105mm) of snow is accumulated. Throughout the year, there are 67.7 snowfall days, and 23.54" (598mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:18 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:55 pm EST.
Sunshine
The average sunshine in December is 3.5h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 1 during December translates into the following guidance:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
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 much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Chester Hill, PA
- Average high temperature in December: 36.3°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
Chester Hill, 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
Chester Hill, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Chester Hill, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is July (76%).
Average rainfall in December
Chester Hill, PA
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is November (1.42").
Average rainfall days in December
Chester Hill, PA
- Average rainfall days in December: 11.4 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in December
Chester Hill, PA
- Average snowfall in December: 4.13"
The month with the highest snowfall is January (6.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Chester Hill, PA
- Average snowfall days in December: 13.8 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Chester Hill, 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 3min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Chester Hill, PA
- Average sunshine days in December: 10.5 days
The month with the most sunshine days is September (15.4 days).
The month with the least sunshine days is February (8.7 days).
Average UV index in December
Chester Hill, 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
Chester Hill, PA
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in December
Chester Hill, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).
Chester Hill, Pennsylvania, USA
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