December weather forecast
Lancaster, PA

englishespañol中文
Share
The city of Lancaster, Pennsylvania, in a stunning early morning panorama
The city of Lancaster, Pennsylvania, in a stunning early morning panorama

Weather in December

The final month of the year, December in Lancaster, Pennsylvania, sees the return of true winter conditions. The mercury further sinks, recording an average high of a cold 42.1°F (5.6°C). Snowfall, though less frequent than January and February, starts to make an appearance. Despite the cold, December showcases many winter festivities that keep the city vibrant. Weather-wise, thick insulation and protective layers are required due to the dipping temperatures to fully enjoy what December has to offer.

Temperature

Lancaster, Pennsylvania, in December undergoes a mild reduction in the average high-temperature, shifting from November's fresh 51.3°F (10.7°C) to a wintry 42.1°F (5.6°C). An average low-temperature of 30°F (-1.1°C) marks the month of December.

Humidity

In December, the average relative humidity in Lancaster is 79%.

Rainfall

In Lancaster, during December, the rain falls for 10.7 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Lancaster, Pennsylvania, during the entire year, the rain falls for 153.4 days and collects up to 28.27" (718mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Lancaster, in December, snow falls for 3.5 days, with typically accumulated 1.22" (31mm) of snow. In Lancaster, during the entire year, snow falls for 20.8 days and aggregates up to 11.46" (291mm) 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 in Lancaster, sunrise is at 7:08 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:50 pm EST.

Sunshine

In December, the average sunshine in Lancaster, Pennsylvania, is 4.7h.

UV index

The months with the lowest UV index in Lancaster, Pennsylvania, are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
[Resources]

Frequently asked questions

Is it cold in Lancaster during December?

During December, Lancaster experiences an average high-temperature of 42.1°F (5.6°C) and a low-temperature of 30°F (-1.1°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 86°F (30°C).

What is the average humidity in December in Lancaster?

In Lancaster, Pennsylvania, the average relative humidity in December is 79%.

How many days does it rain in December in Lancaster?

In Lancaster, Pennsylvania, in December, it is raining for 10.7 days, with typically 2.09" (53mm) of accumulated precipitation.

How many days does it snow in December in Lancaster?

In December, it is snowing for 3.5 days. Throughout December, 1.22" (31mm) of snow is accumulated.

What is the month with the shortest days in Lancaster?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Lancaster have in December?

The average day length in December is 9h and 23min.

What time are sunrise and sunset in December in Lancaster?

In December, on the first day of the month, sunrise is at 7:08 am and sunset at 4:40 pm. On the last day of the month, in Lancaster, Pennsylvania, sunrise is at 7:27 am and sunset at 4:50 pm EST.

How many hours of sunshine does Lancaster have in December?

In December, the average sunshine duration in Lancaster is 4.7h.

When is the lowest UV index in Lancaster?

January, February, 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 Lancaster?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes 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
Lancaster, PA

Average temperature in December - Lancaster, PA
  • Average high temperature in December: 42.1°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

[Resources]

Average pressure in December
Lancaster, PA

Average pressure in December - Lancaster, 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 (29.94"Hg).

[Resources]

Average wind speed in December
Lancaster, PA

Average wind speed in December - Lancaster, PA
  • Average wind speed in December: 8.4mph

The windiest month (with the highest average wind speed) is March (9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

[Resources]

Average humidity in December
Lancaster, PA

Average humidity in December - Lancaster, PA
  • Average humidity in December: 79%

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is April (76%).

[Resources]

Average rainfall in December
Lancaster, PA

Average rainfall in December - Lancaster, PA
  • Average rainfall in December: 2.09"

The wettest month (with the highest rainfall) is August (3.35").
The driest months (with the least rainfall) are February and September (1.89").

[Resources]

Average rainfall days in December
Lancaster, PA

Average rainfall days in December - Lancaster, PA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (8 days).

[Resources]

Average snowfall in December
Lancaster, PA

Average snowfall in December - Lancaster, PA
  • Average snowfall in December: 1.22"

The month with the highest snowfall is March (3.66").
The months with the least snowfall are May, June, July, August, September and October (0").

[Resources]

Average snowfall days in December
Lancaster, PA

Average snowfall days in December - Lancaster, PA
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Lancaster, 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

[Resources]

Average sunshine days in December
Lancaster, PA

Average sunshine days in December - Lancaster, PA
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (11.3 days).

[Resources]

Average UV index in December
Lancaster, PA

Average UV index in December - Lancaster, 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).

[Resources]

Average cloud cover in December
Lancaster, PA

Average cloud cover in December - Lancaster, PA
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 33).

[Resources]

Average visibility in December
Lancaster, PA

Average visibility in December - Lancaster, PA
  • Average visibility in December: 6mi

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

[Resources]

Lancaster, Pennsylvania, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location