December weather forecast
Chapman, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Chapman, Pennsylvania, with an average temperature ranging between min 28.9°F (-1.7°C) and max 40.3°F (4.6°C).

Temperature

The arrival of December corresponds with a temperature reduction, down from November's cool 50°F (10°C) to a wintry 40.3°F (4.6°C). During the nights in December, Chapman experiences a consistent average temperature of 28.9°F (-1.7°C).

Humidity

The average relative humidity in December in Chapman is 80%.

Rainfall

In Chapman, in December, it is raining for 11.2 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 155.8 rainfall days, and 30.75" (781mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 5 days. Throughout December, 2.36" (60mm) of snow is accumulated. Throughout the year, there are 29.4 snowfall days, and 15.87" (403mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:07 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:44 pm EST.

Sunshine

In Chapman, the average sunshine in December is 4.7h.

UV index

The months with the lowest UV index in Chapman 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 exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 2 during December translates into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Updated: Jun 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The high-temperature, in December, in Chapman, records 40.3°F (4.6°C), while the low-temperature is 28.9°F (-1.7°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 80%.

How many days does it rain in December?

In Chapman, in December, during 11.2 rainfall days, 2.68" (68mm) of precipitation is typically accumulated.

How much does it snow in December?

In Chapman, in December, during 5 snowfall days, 2.36" (60mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 19min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.7h.

What are the months with the lowest UV index in Chapman?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December?

In Chapman, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Chapman, PA

Average temperature in December - Chapman, PA
  • Average high temperature in December: 40.3°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 (34.3°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Chapman, PA

Average pressure in December - Chapman, 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
Chapman, PA

Average wind speed in December - Chapman, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
Chapman, PA

Average humidity in December - Chapman, PA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in December
Chapman, PA

Average rainfall in December - Chapman, PA
  • Average rainfall in December: 2.68"

The wettest month (with the highest rainfall) is April (2.99").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in December
Chapman, PA

Average rainfall days in December - Chapman, PA
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (8.5 days).

Average snowfall in December
Chapman, PA

Average snowfall in December - Chapman, PA
  • Average snowfall in December: 2.36"

The month with the highest snowfall is March (4.29").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Chapman, PA

Average snowfall days in December - Chapman, PA
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Chapman, PA

Average daylight in December / Average sunshine in December - Chapman, PA
  • Average daylight in December: 9h and 2min

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 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in December
Chapman, PA

Average sunshine days in December - Chapman, PA
  • Average sunshine days in December: 16.6 days

The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is April (11.2 days).

Average UV index in December
Chapman, PA

Average UV index in December - Chapman, PA
  • Average UV index in December: 2

The months with the highest UV index are 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
Chapman, PA

Average cloud cover in December - Chapman, PA
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Chapman, PA

Average visibility in December - Chapman, PA
  • Average visibility in December: 5mi

The months with the highest visibility are April, June, July and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September, October and December (5mi).

Chapman, Pennsylvania, USA

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