December weather forecast
Macungie, PA

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Weather in December

December, the first month of the winter in Macungie, is still a cold month, with an average temperature ranging between min 28.9°F (-1.7°C) and max 40.3°F (4.6°C).

Temperature

Start of December brings a shift in the average high-temperature, falling from November's cool 50°F (10°C) to a cold 40.3°F (4.6°C). During December nights, Macungie records an average temperature of 28.9°F (-1.7°C).

Humidity

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

Rainfall

In Macungie, in December, it is raining for 10.8 days, with typically 3.03" (77mm) of accumulated precipitation. In Macungie, during the entire year, the rain falls for 156.9 days and collects up to 33.15" (842mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 5.2 days. Throughout December, 2.87" (73mm) of snow is accumulated. Throughout the year, there are 31.2 snowfall days, and 18.98" (482mm) 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 7:06 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:45 pm EST.

Sunshine

In December, the average sunshine is 4.6h.

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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 2 in December translates into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.

Frequently asked questions

Is it cold during December?

In December, in Macungie, the average high-temperature is 40.3°F (4.6°C), and the average low-temperature is 28.9°F (-1.7°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is estimated at 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 80%.

How much does it rain in December?

In Macungie, in December, during 10.8 rainfall days, 3.03" (77mm) of precipitation is typically accumulated.

How many days does it snow in December in Macungie?

In December, it is snowing for 5.2 days. Throughout December, 2.87" (73mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days in Macungie is December, with an average of 9h and 18min of daylight.

How many hours of daylight does Macungie have in December?

In Macungie, the average day length in December is 9h and 20min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:06 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:45 pm EST.

How many hours of sunshine does Macungie have in December?

The average sunshine duration in December is 4.6h.

What is the month 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.

How high is the UV index in December?

In Macungie, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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
Macungie, PA

Average temperature in December - Macungie, PA
  • Average high temperature in December: 40.3°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (34.5°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

Average pressure in December
Macungie, PA

Average pressure in December - Macungie, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Macungie, PA

Average wind speed in December - Macungie, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
Macungie, PA

Average humidity in December - Macungie, PA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (75%).

Average rainfall in December
Macungie, PA

Average rainfall in December - Macungie, PA
  • Average rainfall in December: 3.03"

The wettest month (with the highest rainfall) is July (3.19").
The driest month (with the least rainfall) is September (1.97").

Average rainfall days in December
Macungie, PA

Average rainfall days in December - Macungie, PA
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.1 days).

Average snowfall in December
Macungie, PA

Average snowfall in December - Macungie, PA
  • Average snowfall in December: 2.87"

The month with the highest snowfall is March (5.16").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Macungie, PA

Average snowfall days in December - Macungie, PA
  • Average snowfall days in December: 5.2 days

The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Macungie, PA

Average daylight in December / Average sunshine in December - Macungie, 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 18min).

  • Average sunshine in December: 4h and 4min

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 18min).

Average sunshine days in December
Macungie, PA

Average sunshine days in December - Macungie, PA
  • Average sunshine days in December: 15.8 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (11.3 days).

Average UV index in December
Macungie, PA

Average UV index in December - Macungie, PA
  • Average UV index in December: 2

The months with the highest UV index are 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
Macungie, PA

Average cloud cover in December - Macungie, PA
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Macungie, PA

Average visibility in December - Macungie, PA
  • Average visibility in December: 5mi

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

Macungie, Pennsylvania, USA

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