December weather forecast
Mill Run, PA

Weather in December

December, the first month of the winter, in Mill Run, is still a cold month, with average temperature fluctuating between 27.9°F (-2.3°C) and 39.7°F (4.3°C).

Temperature

In December, the average high-temperature decreases, from a frosty 49.3°F (9.6°C) in November, to a cold 39.7°F (4.3°C). The average low-temperature, in December, is 27.9°F (-2.3°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Mill Run, Pennsylvania, during December, the rain falls for 9.4 days and regularly aggregates up to 1.42" (36mm) of precipitation. Throughout the year, there are 150.7 rainfall days, and 16.65" (423mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Mill Run, Pennsylvania. In Mill Run, Pennsylvania,, during 11.5 snowfall days, 3.74" (95mm) of snow is typically accumulated. In Mill Run, during the entire year, snow falls for 58.2 days, and aggregates up to 17.44" (443mm) of snow.

Daylight

With an average of 9.4h of daylight, December has the shortest days of the year.

Sunshine

In December, the average sunshine in Mill Run is 3.5h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Mill Run?

The average relative humidity in December in Mill Run, Pennsylvania, is 84%.

How much does it rain in Mill Run in December?

In Mill Run, Pennsylvania, in December, during 9.4 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

How much does it snow in Mill Run in December?

In Mill Run, Pennsylvania, in December, during 11.5 snowfall days, 3.74" (95mm) of snow is typically accumulated.

What is the month with the shortest days in Mill Run?

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

What is the average length of the day in December in Mill Run?

In December, the average length of the day in Mill Run is 9.4h.

How long on average sun shines in December in Mill Run?

The average sunshine in December in Mill Run is 3.5h.

What are the months with the lowest UV index in Mill Run?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Mill Run, Pennsylvania.

What is the UV index intensity in December in Mill Run?

In Mill Run, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Mill Run, PA

Average temperature in December - Mill Run, PA
  • Average high temperature in December: 39.7°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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Average pressure in December
Mill Run, PA

Average pressure in December - Mill Run, PA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.95").

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Average wind speed in December
Mill Run, PA

Average wind speed in December - Mill Run, PA
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in December
Mill Run, PA

Average humidity in December - Mill Run, PA
  • Average humidity in December: 84%

Months with the highest relative humidity are January and February (85%).
Months with the lowest relative humidity are July and August (77%).

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Average rainfall in December
Mill Run, PA

Average rainfall in December - Mill Run, PA
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is May (1.97").
The driest months (with the least rainfall) are September and November (0.91").

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Average rainfall days in December
Mill Run, PA

Average rainfall days in December - Mill Run, PA
  • Average rainfall days in December: 9.4 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is February (7.9 days).

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Average snowfall in December
Mill Run, PA

Average snowfall in December - Mill Run, PA
  • Average snowfall in December: 3.74"

The month with the highest snowfall is January (4.29").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Mill Run, PA

Average snowfall days in December - Mill Run, PA
  • Average snowfall days in December: 11.5 days

The month with the highest number of snowfall days is January (15.9 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Mill Run, PA

Average daylight in December / Average sunshine in December - Mill Run, 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: 3.5h

The month with the most sunshine is August (Average sunshine: 9.9h).
The month with the least sunshine is January (Average sunshine: 2.9h).

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Average sunshine days in December
Mill Run, PA

Average sunshine days in December - Mill Run, PA
  • Average sunshine days in December: 12.1 days

The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is January (8.6 days).

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Average UV index in December
Mill Run, PA

Average UV index in December - Mill Run, PA
  • Average UV index in December: 2

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

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Average cloud cover in December
Mill Run, PA

Average cloud cover in December - Mill Run, PA
  • Average cloud cover in December: 65

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 37).

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Average visibility in December
Mill Run, PA

Average visibility in December - Mill Run, PA
  • Average visibility in December: 5mi

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

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