December weather forecast
Mahaffey, PA

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Weather in December

December, the first month of the winter in Mahaffey, is also a wintry month, with an average temperature varying between 36.7°F (2.6°C) and 25.7°F (-3.5°C).

Temperature

A moderate decline in the average high-temperature is seen during December, decreasing from a frosty 45.7°F (7.6°C) in November to a cold 36.7°F (2.6°C). Mahaffey records a mean low-temperature of 25.7°F (-3.5°C) in December.

Humidity

In December, the average relative humidity is 86%.

Rainfall

In December, the rain falls for 8.5 days. Throughout December, 1.46" (37mm) of precipitation is accumulated. In Mahaffey, during the entire year, the rain falls for 136.6 days and collects up to 18.54" (471mm) of precipitation.

Snowfall

Months with snowfall in Mahaffey, Pennsylvania, are January through May, October through December. In Mahaffey, in December, snow falls for 8.4 days, with typically accumulated 2.24" (57mm) of snow. Throughout the year, there are 46.2 snowfall days, and 14.45" (367mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:20 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:39 am and sunset at 4:57 pm EST.

Sunshine

In Mahaffey, the average sunshine in December is 2.8h.

UV index

With an average maximum UV index of 1, December is the month 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 radiation for the average person.
Note: In December, the maximum UV index of 1 suggests this advice:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Updated: Jun 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In December, the average high-temperature and low-temperature are 36.7°F (2.6°C) and 25.7°F (-3.5°C) respectively. In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 86%.

How much does it rain in December?

In Mahaffey, in December, during 8.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 8.4 days. Throughout December, 2.24" (57mm) of snow is 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?

In Mahaffey, the average day length in December is 9h and 18min.

When is the sunrise / sunset in December?

On the first day of December in Mahaffey, sunrise is at 7:20 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:57 pm EST.

How many hours of sunshine does Mahaffey have in December?

In Mahaffey, the average sunshine duration in December is 2.8h.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

What is the UV index reading in December?

In December, the average daily maximum UV index in Mahaffey is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
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
Mahaffey, PA

Average temperature in December - Mahaffey, PA
  • Average high temperature in December: 36.7°F

The warmest month (with the highest average high temperature) is July (81.1°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 (57.9°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average pressure in December
Mahaffey, PA

Average pressure in December - Mahaffey, 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
Mahaffey, PA

Average wind speed in December - Mahaffey, PA
  • Average wind speed in December: 8.7mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Mahaffey, PA

Average humidity in December - Mahaffey, PA
  • Average humidity in December: 86%

The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is July (77%).

Average rainfall in December
Mahaffey, PA

Average rainfall in December - Mahaffey, PA
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are January and November (1.06").

Average rainfall days in December
Mahaffey, PA

Average rainfall days in December - Mahaffey, PA
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is February (5.8 days).

Average snowfall in December
Mahaffey, PA

Average snowfall in December - Mahaffey, PA
  • Average snowfall in December: 2.24"

The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Mahaffey, PA

Average snowfall days in December - Mahaffey, PA
  • Average snowfall days in December: 8.4 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Mahaffey, 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 5min

The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).

Average sunshine days in December
Mahaffey, PA

Average sunshine days in December - Mahaffey, PA
  • Average sunshine days in December: 15.8 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.7 days).

Average UV index in December
Mahaffey, PA

Average UV index in December - Mahaffey, 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
Mahaffey, PA

Average cloud cover in December - Mahaffey, PA
  • Average cloud cover in December: 72

The month with the most cloud cover is January (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 40).

Average visibility in December
Mahaffey, PA

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

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

Mahaffey, Pennsylvania, USA

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