December weather forecast
Clay Hill, PA

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Weather in December

December, the first month of the winter in Clay Hill, is also a wintry month, with an average temperature ranging between min 28.9°F (-1.7°C) and max 41.2°F (5.1°C).

Temperature

Clay Hill, Pennsylvania, in December undergoes a mild reduction in the average high-temperature, shifting from November's fresh 50.5°F (10.3°C) to a cold 41.2°F (5.1°C). In the month of December, the average temperature dips to a subzero cold 28.9°F (-1.7°C) during the night.

Humidity

The months with the highest humidity in Clay Hill are February, May, October and December, with an average relative humidity of 79%.

Rainfall

In December, the rain falls for 10.3 days. Throughout December, 2.01" (51mm) of precipitation is accumulated. In Clay Hill, during the entire year, the rain falls for 161.8 days and collects up to 28.07" (713mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Clay Hill. In Clay Hill, in December, snow falls for 4.7 days, with typically accumulated 2.13" (54mm) of snow. Throughout the year, there are 26.6 snowfall days, and 14.69" (373mm) of snow is accumulated.

Daylight

The month with the shortest days in Clay Hill is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:13 am and sunset at 4:46 pm. On the last day of December, in Clay Hill, sunrise is at 7:31 am and sunset at 4:56 pm EST.

Sunshine

The average sunshine in December in Clay Hill is 4.8h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In December, the maximum UV index of 2 suggests this advice:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

How cold does it get in Clay Hill in December?

In Clay Hill, in December, the average high-temperature is 41.2°F (5.1°C), and the average low-temperature is 28.9°F (-1.7°C). The average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, in August is appraised at 87.8°F (31°C).

What are the most humid months in Clay Hill?

The months with the highest humidity are February, May, October and December, with an average relative humidity of 79%.

What is the average humidity in December in Clay Hill?

The average relative humidity in December is 79%.

How many days does it rain in December in Clay Hill?

In Clay Hill, in December, it is raining for 10.3 days, with typically 2.01" (51mm) of accumulated precipitation.

How much does it snow in Clay Hill in December?

In Clay Hill, Pennsylvania, in December, snow falls for 4.7 days, with typically accumulated 2.13" (54mm) of snow.

What is the month with the shortest days in Clay Hill?

With an average of 9h and 24min of daylight, December has the shortest days of the year in Clay Hill.

How many hours of daylight does Clay Hill have in December?

The average day length in December in Clay Hill, Pennsylvania, is 9h and 24min.

When is the sunrise / sunset in December in Clay Hill?

In December, on the first day of the month, sunrise is at 7:13 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:56 pm EST.

How many hours of sunshine does Clay Hill have in December?

The average sunshine duration in December in Clay Hill, Pennsylvania, is 4.8h.

What are the months with the lowest UV index in Clay Hill?

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

What is the UV index intensity in December in Clay Hill?

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 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
Clay Hill, PA

Average temperature in December - Clay Hill, PA
  • Average high temperature in December: 41.2°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in December
Clay Hill, PA

Average pressure in December - Clay Hill, PA
  • Average pressure in December: 30.11"Hg

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

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Average wind speed in December
Clay Hill, PA

Average wind speed in December - Clay Hill, PA
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is January (7.7mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).

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Average humidity in December
Clay Hill, PA

Average humidity in December - Clay Hill, PA
  • Average humidity in December: 79%

The months with the highest relative humidity are February, May, October and December (79%).
The months with the lowest relative humidity are April and July (75%).

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Average rainfall in December
Clay Hill, PA

Average rainfall in December - Clay Hill, PA
  • Average rainfall in December: 2.01"

The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in December
Clay Hill, PA

Average rainfall days in December - Clay Hill, PA
  • Average rainfall days in December: 10.3 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is November (9 days).

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Average snowfall in December
Clay Hill, PA

Average snowfall in December - Clay Hill, PA
  • Average snowfall in December: 2.13"

The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Clay Hill, PA

Average snowfall days in December - Clay Hill, PA
  • Average snowfall days in December: 4.7 days

The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Clay Hill, PA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Clay Hill, PA

Average sunshine days in December - Clay Hill, PA
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.4 days).

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Average UV index in December
Clay Hill, PA

Average UV index in December - Clay Hill, 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, November and December (UV index 2).

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Average cloud cover in December
Clay Hill, PA

Average cloud cover in December - Clay Hill, PA
  • Average cloud cover in December: 50

The months with the most cloud cover are January, February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in December
Clay Hill, PA

Average visibility in December - Clay Hill, PA
  • Average visibility in December: 5mi

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

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Clay Hill, Pennsylvania, USA

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