December weather forecast
Summit Hill, PA

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Weather in December

The first month of the winter, December, is also an icy month in Summit Hill, Pennsylvania, with an average temperature ranging between min 27.3°F (-2.6°C) and max 38.1°F (3.4°C).

Temperature

The decrease of average high-temperatures is mild in December, with a decline from a frosty 47.3°F (8.5°C) in November to an icy 38.1°F (3.4°C). During December, the average low-temperature is recorded at a subzero cold 27.3°F (-2.6°C).

Humidity

February and December, with an average relative humidity of 83%, are the most humid months.

Rainfall

In December, the rain falls for 12.2 days. Throughout December, 2.87" (73mm) of precipitation is accumulated. Throughout the year, there are 167.5 rainfall days, and 33.66" (855mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 8.7 days. Throughout December, 4.06" (103mm) of snow is accumulated. Throughout the year, there are 49.4 snowfall days, and 27.56" (700mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:45 pm EST.

Sunshine

In Summit Hill, the average sunshine in December is 4.4h.

UV index

January through March, November and 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 low health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.

Frequently asked questions

Is it cold during December?

Summit Hill in December has an average high-temperature of 38.1°F (3.4°C) and an average low-temperature of 27.3°F (-2.6°C). In July, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 86°F (30°C).

What are the most humid months?

The months with the highest humidity are February and December, with an average relative humidity of 83%.

What is the average humidity in December in Summit Hill?

In December, the average relative humidity is 83%.

How much does it rain in December?

In Summit Hill, Pennsylvania, in December, it is raining for 12.2 days, with typically 2.87" (73mm) of accumulated precipitation.

How many days does it snow in December?

In Summit Hill, during December, snow falls for 8.7 days and regularly aggregates up to 4.06" (103mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December in Summit Hill?

In December, the average day length is 9h and 18min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:09 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:45 pm EST.

How long on average sun shines in December?

In Summit Hill, the average sunshine duration in December is 4.4h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk 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
Summit Hill, PA

Average temperature in December - Summit Hill, PA
  • Average high temperature in December: 38.1°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in December
Summit Hill, PA

Average pressure in December - Summit Hill, 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
Summit Hill, PA

Average wind speed in December - Summit Hill, PA
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Summit Hill, PA

Average humidity in December - Summit Hill, PA
  • Average humidity in December: 83%

The months with the highest relative humidity are February and December (83%).
The month with the lowest relative humidity is April (77%).

Average rainfall in December
Summit Hill, PA

Average rainfall in December - Summit Hill, PA
  • Average rainfall in December: 2.87"

The wettest months (with the highest rainfall) are May, July and August (3.19").
The driest month (with the least rainfall) is September (2.01").

Average rainfall days in December
Summit Hill, PA

Average rainfall days in December - Summit Hill, PA
  • Average rainfall days in December: 12.2 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (9.6 days).

Average snowfall in December
Summit Hill, PA

Average snowfall in December - Summit Hill, PA
  • Average snowfall in December: 4.06"

The month with the highest snowfall is January (6.93").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Summit Hill, PA

Average snowfall days in December - Summit Hill, PA
  • Average snowfall days in December: 8.7 days

The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Summit Hill, PA

Average daylight in December / Average sunshine in December - Summit Hill, 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: 4h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

Average sunshine days in December
Summit Hill, PA

Average sunshine days in December - Summit Hill, PA
  • Average sunshine days in December: 14 days

The month with the most sunshine days is November (15.7 days).
The month with the least sunshine days is May (9.7 days).

Average UV index in December
Summit Hill, PA

Average UV index in December - Summit Hill, PA
  • Average UV index in December: 2

The month with the highest UV index is 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
Summit Hill, PA

Average cloud cover in December - Summit Hill, PA
  • Average cloud cover in December: 54

The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in December
Summit Hill, PA

Average visibility in December - Summit Hill, 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).

Summit Hill, Pennsylvania, USA

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