December weather forecast
Zionsville, PA

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Weather in December

December, the first month of the winter in Zionsville, is also an icy month, with an average temperature varying between 28.9°F (-1.7°C) and 40.3°F (4.6°C).

Temperature

A shift in Zionsville's weather is observed as November turns into December, with the average high temperature reducing from a cool 50°F (10°C) to a wintry 40.3°F (4.6°C). Zionsville's nighttime temperature in December falls to an average of 28.9°F (-1.7°C).

Humidity

The average relative humidity in December is 80%.

Rainfall

In Zionsville, in December, it is raining for 10.8 days, with typically 3.03" (77mm) of accumulated precipitation. Throughout the year, there are 156.9 rainfall days, and 33.15" (842mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Zionsville, during December, snow falls for 5.2 days and regularly aggregates up to 2.87" (73mm) of snow. Throughout the year, there are 31.2 snowfall days, and 18.98" (482mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:45 pm EST.

Sunshine

In Zionsville, the average sunshine in December is 4.6h.

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 unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.

Frequently asked questions

How cold is December?

The average high-temperature, in December, in Zionsville, is 40.3°F (4.6°C), while the average low-temperature is 28.9°F (-1.7°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is appraised at 86°F (30°C).

What is the average humidity in December?

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

How much does it rain in December?

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

How many days does it snow in December?

In Zionsville, in December, snow falls for 5.2 days, with typically accumulated 2.87" (73mm) of snow.

What is the month with the shortest days in Zionsville?

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

What is the average length of the day in December?

The average day length in December is 9h and 20min.

When are sunrise and sunset in December in Zionsville?

On the first day of December, sunrise is at 7:06 am and sunset at 4:35 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 Zionsville have in December?

In Zionsville, Pennsylvania, the average sunshine duration in December is 4.6h.

When is the lowest UV index?

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

What is the UV index reading in December?

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

Average temperature in December - Zionsville, 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
Zionsville, PA

Average pressure in December - Zionsville, 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
Zionsville, PA

Average wind speed in December - Zionsville, 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
Zionsville, PA

Average humidity in December - Zionsville, 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
Zionsville, PA

Average rainfall in December - Zionsville, 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
Zionsville, PA

Average rainfall days in December - Zionsville, 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
Zionsville, PA

Average snowfall in December - Zionsville, 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
Zionsville, PA

Average snowfall days in December - Zionsville, 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
Zionsville, PA

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

Average sunshine days in December - Zionsville, 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
Zionsville, PA

Average UV index in December - Zionsville, 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
Zionsville, PA

Average cloud cover in December - Zionsville, 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
Zionsville, PA

Average visibility in December - Zionsville, 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).

Zionsville, Pennsylvania, USA

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