December weather forecast
Rochester Mills, PA

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Weather in December

The first month of the winter, December, is still a cold month in Rochester Mills, Pennsylvania, with an average temperature varying between 36.7°F (2.6°C) and 25.7°F (-3.5°C).

Temperature

Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 46.2°F (7.9°C) in November to a wintry 36.7°F (2.6°C). Rochester Mills experiences a mean low-temperature of 25.7°F (-3.5°C) during December.

Humidity

In December, the average relative humidity is 86%.

Rainfall

In Rochester Mills, Pennsylvania, during December, the rain falls for 10.5 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Rochester Mills, Pennsylvania, during the entire year, the rain falls for 151.9 days and collects up to 22.13" (562mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Rochester Mills, in December, during 14.6 snowfall days, 4.21" (107mm) of snow is typically accumulated. Throughout the year, there are 71 snowfall days, and 22.32" (567mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:40 am and sunset at 4:58 pm EST.

Sunshine

In December, the average sunshine is 2.6h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: During December, 1 as the daily maximum UV index converts into the following advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Stay sun-safe with clothing that is both closely woven and worn loosely. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Rochester Mills, records 36.7°F (2.6°C), while the low-temperature is 25.7°F (-3.5°C). In July, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is appraised at 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 86%.

How much does it rain in December?

In December, the rain falls for 10.5 days. Throughout December, 1.73" (44mm) of precipitation is accumulated.

How much does it snow in December?

In Rochester Mills, during December, snow falls for 14.6 days and regularly aggregates up to 4.21" (107mm) of snow.

What is the month with the shortest days?

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 Rochester Mills, the average day length in December is 9h and 18min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:21 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:58 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 2.6h.

What is the month with the lowest UV index in Rochester Mills?

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

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 minimal health vulnerability from exposure to the Sun's 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
Rochester Mills, PA

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

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.4°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

Average pressure in December
Rochester Mills, PA

Average pressure in December - Rochester Mills, 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
Rochester Mills, PA

Average wind speed in December - Rochester Mills, PA
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Rochester Mills, PA

Average humidity in December - Rochester Mills, PA
  • Average humidity in December: 86%

The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are June, July and August (78%).

Average rainfall in December
Rochester Mills, PA

Average rainfall in December - Rochester Mills, PA
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is April (2.48").
The driest month (with the least rainfall) is November (1.26").

Average rainfall days in December
Rochester Mills, PA

Average rainfall days in December - Rochester Mills, PA
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December
Rochester Mills, PA

Average snowfall in December - Rochester Mills, PA
  • Average snowfall in December: 4.21"

The month with the highest snowfall is January (5.63").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Rochester Mills, PA

Average snowfall days in December - Rochester Mills, PA
  • Average snowfall days in December: 14.6 days

The month with the highest number of snowfall days is January (18.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Rochester Mills, PA

Average daylight in December / Average sunshine in December - Rochester Mills, 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 4min

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 30min).

Average sunshine days in December
Rochester Mills, PA

Average sunshine days in December - Rochester Mills, PA
  • Average sunshine days in December: 9.2 days

The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (7.8 days).

Average UV index in December
Rochester Mills, PA

Average UV index in December - Rochester Mills, 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
Rochester Mills, PA

Average cloud cover in December - Rochester Mills, PA
  • Average cloud cover in December: 72

The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is August (Cloud cover 39).

Average visibility in December
Rochester Mills, PA

Average visibility in December - Rochester Mills, PA
  • Average visibility in December: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).

Rochester Mills, Pennsylvania, USA

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