December weather forecast
Tullytown, PA

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Weather in December

December, the first month of the winter in Tullytown, is also a frosty month, with an average temperature fluctuating between 32.4°F (0.2°C) and 43.7°F (6.5°C).

Temperature

A subtle change in temperatures is noted as November gives way to December, with average highs reducing from a fresh 52.3°F (11.3°C) to a chilly 43.7°F (6.5°C). In December, Tullytown experiences a temperature dip to an average of 32.4°F (0.2°C) at night.

Humidity

In Tullytown, the average relative humidity in December is 77%.

Rainfall

In December, the rain falls for 10.9 days. Throughout December, 3.19" (81mm) of precipitation is accumulated. Throughout the year, there are 154.4 rainfall days, and 31.38" (797mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In Tullytown, in December, during 2.8 snowfall days, 1.22" (31mm) of snow is typically accumulated. Throughout the year, there are 15.9 snowfall days, and 8.5" (216mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:43 pm EST.

Sunshine

In December, the average sunshine is 5h.

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 value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.

Frequently asked questions

Is it cold during December?

The high-temperature during December is 43.7°F (6.5°C) and the low-temperature is 32.4°F (0.2°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is computed to be 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December in Tullytown, Pennsylvania, is 77%.

How much does it rain in December?

In December, the rain falls for 10.9 days. Throughout December, 3.19" (81mm) of precipitation is accumulated.

How much does it snow in December?

In Tullytown, in December, snow falls for 2.8 days, with typically accumulated 1.22" (31mm) of snow.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year in Tullytown.

What is the average length of the day in December?

In Tullytown, the average day length in December is 9h and 22min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:43 pm EST.

How long on average sun shines in December?

In Tullytown, Pennsylvania, the average sunshine duration in December is 5h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

In Tullytown, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Tullytown, PA

Average temperature in December - Tullytown, PA
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 32.4°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in December
Tullytown, PA

Average pressure in December - Tullytown, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Tullytown, PA

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

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Tullytown, PA

Average humidity in December - Tullytown, PA
  • Average humidity in December: 77%

The months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).

Average rainfall in December
Tullytown, PA

Average rainfall in December - Tullytown, PA
  • Average rainfall in December: 3.19"

The wettest month (with the highest rainfall) is July (3.66").
The driest month (with the least rainfall) is January (1.89").

Average rainfall days in December
Tullytown, PA

Average rainfall days in December - Tullytown, PA
  • Average rainfall days in December: 10.9 days

The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is January (8 days).

Average snowfall in December
Tullytown, PA

Average snowfall in December - Tullytown, PA
  • Average snowfall in December: 1.22"

The month with the highest snowfall is March (2.99").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Tullytown, PA

Average snowfall days in December - Tullytown, PA
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Tullytown, 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 24min).

  • Average sunshine in December: 5h and 0min

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 48min).

Average sunshine days in December
Tullytown, PA

Average sunshine days in December - Tullytown, PA
  • Average sunshine days in December: 18.1 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.9 days).

Average UV index in December
Tullytown, PA

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

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Tullytown, PA

Average cloud cover in December - Tullytown, PA
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Tullytown, PA

Average visibility in December - Tullytown, PA
  • Average visibility in December: 6mi

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

Tullytown, Pennsylvania, USA

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