December weather forecast
Pottstown, PA

Weather in December

December, the first month of the winter, in Pottstown, is still a cold month, with average temperature fluctuating between 41.5°F (5.3°C) and 30.2°F (-1°C).

Temperature

In December, the average high-temperature drops, from a cool 50.7°F (10.4°C) in November, to a wintry 41.5°F (5.3°C). In Pottstown, Pennsylvania,, the average low-temperature is 30.2°F (-1°C).

Humidity

In December, the average relative humidity in Pottstown is 79%.

Rainfall

In Pottstown, during December, the rain falls for 9.5 days and regularly aggregates up to 2.32" (59mm) of precipitation. Throughout the year, there are 146.5 rainfall days, and 27.87" (708mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In December, it is snowing for 2.7 days. Throughout December, 1.89" (48mm) of snow is accumulated. In Pottstown, Pennsylvania, during the entire year, snow falls for 19.1 days, and aggregates up to 11.54" (293mm) of snow.

Daylight

The month with the shortest days in Pottstown is December, with an average of 9.4h of daylight.

Sunshine

In December, the average sunshine in Pottstown, Pennsylvania, is 4.9h.

UV index

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Pottstown?

The average relative humidity in December in Pottstown is 79%.

How much does it rain in Pottstown in December?

In Pottstown, Pennsylvania, in December, it is raining for 9.5 days, with typically 2.32" (59mm) of accumulated precipitation.

How many days does it snow in December in Pottstown?

In Pottstown, in December, during 2.7 snowfall days, 1.89" (48mm) of snow is typically accumulated.

What is the month with the shortest days in Pottstown?

December has the shortest days of the year in Pottstown, with an average of 9.4h of daylight.

How many hours of daylight does Pottstown have in December?

In December, the average length of the day in Pottstown, Pennsylvania, is 9.4h.

How many hours of sunshine does Pottstown have in December?

In Pottstown, Pennsylvania, the average sunshine in December is 4.9h.

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

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

What is the UV index reading in December in Pottstown?

In Pottstown, Pennsylvania, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to the Sun's UV rays.

Average temperature in December
Pottstown, PA

Average temperature in December - Pottstown, PA
  • Average high temperature in December: 41.5°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

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Average pressure in December
Pottstown, PA

Average pressure in December - Pottstown, PA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is November (30.12").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in December
Pottstown, PA

Average wind speed in December - Pottstown, 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 (5mph).

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Average humidity in December
Pottstown, PA

Average humidity in December - Pottstown, PA
  • Average humidity in December: 79%

Months with the highest relative humidity are February and October (80%).
Months with the lowest relative humidity are April and July (75%).

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Average rainfall in December
Pottstown, PA

Average rainfall in December - Pottstown, PA
  • Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in December
Pottstown, PA

Average rainfall days in December - Pottstown, PA
  • Average rainfall days in December: 9.5 days

Months with the highest number of rainy days are May and July (17 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in December
Pottstown, PA

Average snowfall in December - Pottstown, PA
  • Average snowfall in December: 1.89"

The month with the highest snowfall is March (3.7").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Pottstown, PA

Average snowfall days in December - Pottstown, PA
  • Average snowfall days in December: 2.7 days

The month with the highest number of snowfall days is January (5.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Pottstown, PA
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in December
Pottstown, PA

Average sunshine days in December - Pottstown, PA
  • Average sunshine days in December: 19.4 days

The month with the most sunshine days is November (21 days).
The month with the least sunshine days is May (12.3 days).

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Average UV index in December
Pottstown, PA

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

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

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Average cloud cover in December
Pottstown, PA

Average cloud cover in December - Pottstown, PA
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in December
Pottstown, PA

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

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

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