December weather forecast
Millheim, PA

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Weather in December

December, the first month of the winter in Millheim, is also a wintry month, with temperature in the range of an average high of 37.4°F (3°C) and an average low of 26.8°F (-2.9°C).

Temperature

The arrival of December indicates a decrease in the average high-temperature, moving from a chilly 47.1°F (8.4°C) in November to a wintry 37.4°F (3°C). In December, Millheim encounters an average low-temperature of 26.8°F (-2.9°C) during the night.

Humidity

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

Rainfall

In Millheim, in December, it is raining for 12.9 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 173.6 rainfall days, and 33.23" (844mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Millheim. In Millheim, in December, snow falls for 10.9 days, with typically accumulated 5.04" (128mm) of snow. Throughout the year, there are 55.7 snowfall days, and 28.62" (727mm) 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 the month, sunrise is at 7:15 am and sunset at 4:42 pm. On the last day of December, in Millheim, Pennsylvania, sunrise is at 7:34 am and sunset at 4:52 pm EST.

Sunshine

The average sunshine in December is 4.1h.

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 threat to health from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. When the Sun is at its strongest around midday, find shade and limit exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.

Frequently asked questions

How cold is it in December?

December temperatures vary between a high-temperature of 37.4°F (3°C) and a low-temperature of 26.8°F (-2.9°C). In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, is appraised at 89.6°F (32°C).

What is the most humid month?

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

What is the average humidity in December?

The average relative humidity in December is 83%.

How much does it rain in December?

In Millheim, in December, it is raining for 12.9 days, with typically 2.68" (68mm) of accumulated precipitation.

How many days does it snow in December?

In Millheim, in December, during 10.9 snowfall days, 5.04" (128mm) of snow is typically accumulated.

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.

How many hours of daylight does Millheim have in December?

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 7:15 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:52 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.1h.

When is 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 reading in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe exposure to Sun's UV rays.
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
Millheim, PA

Average temperature in December - Millheim, PA
  • Average high temperature in December: 37.4°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in December: 26.8°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in December
Millheim, PA

Average pressure in December - Millheim, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Millheim, PA

Average wind speed in December - Millheim, PA
  • Average wind speed in December: 6.9mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in December
Millheim, PA

Average humidity in December - Millheim, 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 July (76%).

Average rainfall in December
Millheim, PA

Average rainfall in December - Millheim, PA
  • Average rainfall in December: 2.68"

The wettest month (with the highest rainfall) is May (3.54").
The driest month (with the least rainfall) is November (2.2").

Average rainfall days in December
Millheim, PA

Average rainfall days in December - Millheim, PA
  • Average rainfall days in December: 12.9 days

The month with the highest number of rainy days is May (19.7 days).
The month with the least rainy days is February (8.8 days).

Average snowfall in December
Millheim, PA

Average snowfall in December - Millheim, PA
  • Average snowfall in December: 5.04"

The month with the highest snowfall is February (7.44").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Millheim, PA

Average snowfall days in December - Millheim, PA
  • Average snowfall days in December: 10.9 days

The month with the highest number of snowfall days is January (15 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Millheim, 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 1min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).

Average sunshine days in December
Millheim, PA

Average sunshine days in December - Millheim, PA
  • Average sunshine days in December: 11.5 days

The month with the most sunshine days is November (15.9 days).
The month with the least sunshine days is May (9.4 days).

Average UV index in December
Millheim, PA

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

The month with the highest UV index is June (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
Millheim, PA

Average cloud cover in December - Millheim, PA
  • Average cloud cover in December: 58

The months with the most cloud cover are January, February and December (Cloud cover 58).
The month with the least cloud cover is July (Cloud cover 35).

Average visibility in December
Millheim, PA

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

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

Millheim, Pennsylvania, USA

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