December weather forecast
Harmonyville, PA

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Weather in December

The first month of the winter, December, is still a cold month in Harmonyville, Pennsylvania, with an average temperature fluctuating between 30°F (-1.1°C) and 41.4°F (5.2°C).

Temperature

During the shift to December, a minor reduction in average high-temperature is observed, shifting from a cool 50.4°F (10.2°C) in November to a cold 41.4°F (5.2°C). Throughout December nights, Harmonyville registers an average low-temperature of 30°F (-1.1°C).

Humidity

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

Rainfall

In Harmonyville, during December, the rain falls for 11.1 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Harmonyville, during the entire year, the rain falls for 162.2 days and collects up to 27.87" (708mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Harmonyville, in December, snow falls for 3.6 days, with typically accumulated 1.42" (36mm) of snow. In Harmonyville, during the entire year, snow falls for 22.9 days and aggregates up to 10.35" (263mm) of snow.

Daylight

December has the shortest days of the year, 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

In December, the average sunshine 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 value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.

Frequently asked questions

Is it cold during December?

In Harmonyville, 41.4°F (5.2°C) is the average high-temperature and 30°F (-1.1°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December in Harmonyville is 80%.

How many days does it rain in December?

In Harmonyville, in December, it is raining for 11.1 days, with typically 2.24" (57mm) of accumulated precipitation.

How many days does it snow in December?

In Harmonyville, in December, snow falls for 3.6 days, with typically accumulated 1.42" (36mm) of snow.

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.

What is the average length of the day in December in Harmonyville?

In Harmonyville, the average day length in December is 9h and 22min.

When is the sunrise / sunset in December?

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.

How many hours of sunshine does Harmonyville have in December?

In Harmonyville, Pennsylvania, the average sunshine duration in December is 4.9h.

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 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
Harmonyville, PA

Average temperature in December - Harmonyville, 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
Harmonyville, PA

Average pressure in December - Harmonyville, 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
Harmonyville, PA

Average wind speed in December - Harmonyville, 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
Harmonyville, PA

Average humidity in December - Harmonyville, 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
Harmonyville, PA

Average rainfall in December - Harmonyville, 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
Harmonyville, PA

Average rainfall days in December - Harmonyville, 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
Harmonyville, PA

Average snowfall in December - Harmonyville, 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
Harmonyville, PA

Average snowfall days in December - Harmonyville, 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
Harmonyville, PA

Average daylight in December / Average sunshine in December - Harmonyville, 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
Harmonyville, PA

Average sunshine days in December - Harmonyville, 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
Harmonyville, PA

Average UV index in December - Harmonyville, 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
Harmonyville, PA

Average cloud cover in December - Harmonyville, 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
Harmonyville, PA

Average visibility in December - Harmonyville, 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).

Harmonyville, Pennsylvania, USA

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