December weather forecast
Saint Peters, PA

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Weather in December

December, the first month of the winter in Saint Peters, is still a cold month, with temperature in the range of an average high of 41.4°F (5.2°C) and an average low of 30°F (-1.1°C).

Temperature

The onset of December aligns with a soft reduction in the average high-temperature, gently falling from a fresh 50.4°F (10.2°C) in November to a wintry 41.4°F (5.2°C). Throughout the December nights, Saint Peters encounters a low-temperature of 30°F (-1.1°C).

Humidity

In December, the average relative humidity is 80%.

Rainfall

In December, the rain falls for 11.1 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. Throughout the year, in Saint Peters, Pennsylvania, there are 162.2 rainfall days, and 27.87" (708mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Saint Peters, during December, snow falls for 3.6 days and regularly aggregates up to 1.42" (36mm) of snow. Throughout the year, there are 22.9 snowfall days, and 10.35" (263mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:47 pm EST.

Sunshine

The average sunshine in December is 4.9h.

UV index

The 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 minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.

Frequently asked questions

Is it cold in Saint Peters during December?

The high-temperature during December is 41.4°F (5.2°C) and the low-temperature is 30°F (-1.1°C). The average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, in August is estimated at 86°F (30°C).

What is the average humidity in December?

In Saint Peters, the average relative humidity in December is 80%.

How much does it rain in December?

In Saint Peters, in December, during 11.1 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, in Saint Peters, it is snowing for 3.6 days. Throughout December, 1.42" (36mm) 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 24min of daylight.

How many hours of daylight does Saint Peters have in December?

The average day length in December is 9h and 22min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:47 pm EST.

How long on average sun shines in December?

In Saint Peters, the average sunshine duration in December is 4.9h.

When is the lowest UV index?

The 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?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Saint Peters, PA

Average temperature in December - Saint Peters, PA
  • Average high temperature in December: 41.4°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure in December
Saint Peters, PA

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

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Saint Peters, PA

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

The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Saint Peters, PA

Average humidity in December - Saint Peters, PA
  • Average humidity in December: 80%

The months with the highest relative humidity are February and October (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Saint Peters, PA

Average rainfall in December - Saint Peters, PA
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in December
Saint Peters, PA

Average rainfall days in December - Saint Peters, PA
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (9.4 days).

Average snowfall in December
Saint Peters, PA

Average snowfall in December - Saint Peters, PA
  • Average snowfall in December: 1.42"

The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Saint Peters, PA

Average snowfall days in December - Saint Peters, PA
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Saint Peters, PA

Average daylight in December / Average sunshine in December - Saint Peters, 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: 4h and 5min

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 42min).

Average sunshine days in December
Saint Peters, PA

Average sunshine days in December - Saint Peters, PA
  • Average sunshine days in December: 15.9 days

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is May (11.6 days).

Average UV index in December
Saint Peters, PA

Average UV index in December - Saint Peters, PA
  • Average UV index in December: 2

The months with the highest UV index are May, 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
Saint Peters, PA

Average cloud cover in December - Saint Peters, PA
  • Average cloud cover in December: 49

The months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Saint Peters, PA

Average visibility in December - Saint Peters, PA
  • Average visibility in December: 6mi

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

Saint Peters, Pennsylvania, USA

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