December weather forecast
Petersburg, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Petersburg, Pennsylvania, with an average temperature ranging between min 27.3°F (-2.6°C) and max 37.6°F (3.1°C).

Temperature

Petersburg's weather in December involves a decrease in the average high-temperature, moving down from November's chilly 47.3°F (8.5°C) to a cold 37.6°F (3.1°C). During December, the temperature is averaged to a low of 27.3°F (-2.6°C) at night.

Humidity

The average relative humidity in December is 83%.

Rainfall

In December, the rain falls for 12.6 days. Throughout December, 2.01" (51mm) of precipitation is accumulated. In Petersburg, during the entire year, the rain falls for 166.2 days and collects up to 23.86" (606mm) of precipitation.

Snowfall

Months with snowfall in Petersburg are January through May, October through December. In Petersburg, during December, snow falls for 9.1 days and regularly aggregates up to 2.64" (67mm) of snow. In Petersburg, Pennsylvania, during the entire year, snow falls for 50 days and aggregates up to 16.77" (426mm) of snow.

Daylight

The month with the shortest days in Petersburg, Pennsylvania, is December, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:17 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:55 pm EST.

Sunshine

In Petersburg, the average sunshine in December is 3.9h.

UV index

December is the month with the lowest UV index in Petersburg, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 1 in December translates into this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.

Frequently asked questions

How cold is December?

The average high-temperature, in December, in Petersburg, is 37.6°F (3.1°C), while the average low-temperature is 27.3°F (-2.6°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 87.8°F (31°C).

What is the average humidity in December?

In Petersburg, the average relative humidity in December is 83%.

How many days does it rain in December?

In Petersburg, in December, during 12.6 rainfall days, 2.01" (51mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Petersburg, during December, snow falls for 9.1 days and regularly aggregates up to 2.64" (67mm) of snow.

What is the month with the shortest days in Petersburg?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In Petersburg, the average day length in December is 9h and 20min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:17 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:55 pm EST.

How many hours of sunshine does Petersburg have in December?

In Petersburg, the average sunshine duration in December is 3.9h.

When is 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 is 1. A UV Index value of 2, and less, symbolizes a low health threat 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
Petersburg, PA

Average temperature in December - Petersburg, PA
  • Average high temperature in December: 37.6°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (31.6°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in December
Petersburg, PA

Average pressure in December - Petersburg, 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
Petersburg, PA

Average wind speed in December - Petersburg, PA
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in December
Petersburg, PA

Average humidity in December - Petersburg, PA
  • Average humidity in December: 83%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is July (76%).

Average rainfall in December
Petersburg, PA

Average rainfall in December - Petersburg, PA
  • Average rainfall in December: 2.01"

The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is November (1.5").

Average rainfall days in December
Petersburg, PA

Average rainfall days in December - Petersburg, PA
  • Average rainfall days in December: 12.6 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (10.3 days).

Average snowfall in December
Petersburg, PA

Average snowfall in December - Petersburg, PA
  • Average snowfall in December: 2.64"

The month with the highest snowfall is January (4.49").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Petersburg, PA

Average snowfall days in December - Petersburg, PA
  • Average snowfall days in December: 9.1 days

The month with the highest number of snowfall days is January (15 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Petersburg, 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: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in December
Petersburg, PA

Average sunshine days in December - Petersburg, PA
  • Average sunshine days in December: 13.3 days

The month with the most sunshine days is November (15.6 days).
The month with the least sunshine days is February (9.5 days).

Average UV index in December
Petersburg, PA

Average UV index in December - Petersburg, PA
  • Average UV index in December: 1

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Petersburg, PA

Average cloud cover in December - Petersburg, PA
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 35).

Average visibility in December
Petersburg, PA

Average visibility in December - Petersburg, 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).

Petersburg, Pennsylvania, USA

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