December weather forecast
Lenni, PA

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Weather in December

December, the first month of the winter in Lenni, is also a frosty month, with an average temperature varying between 32.5°F (0.3°C) and 43.5°F (6.4°C).

Temperature

The commencement of December includes a gentle temperature shift, with the average high-temperature dropping a bit from a cool 52.2°F (11.2°C) in November to a chilly 43.5°F (6.4°C). In the month of December, Lenni records a consistent average low-temperature of 32.5°F (0.3°C).

Humidity

In Lenni, Pennsylvania, the average relative humidity in December is 77%.

Rainfall

In Lenni, in December, during 11.1 rainfall days, 3.31" (84mm) of precipitation is typically accumulated. Throughout the year, there are 166.6 rainfall days, and 35.59" (904mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Lenni, in December, snow falls for 3.4 days, with typically accumulated 1.61" (41mm) of snow. Throughout the year, there are 22 snowfall days, and 11.81" (300mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:47 pm EST.

Sunshine

In Lenni, Pennsylvania, the average sunshine in December is 5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 2 suggests these recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The high-temperature, in December, in Lenni, records 43.5°F (6.4°C), while the low-temperature is 32.5°F (0.3°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is evaluated at 89.6°F (32°C).

What is the average humidity in December?

In Lenni, the average relative humidity in December is 77%.

How many days does it rain in December?

In Lenni, in December, during 11.1 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

How much does it snow in December?

In Lenni, Pennsylvania, during December, snow falls for 3.4 days and regularly aggregates up to 1.61" (41mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

How many hours of daylight does Lenni have in December?

The average day length in December is 9h and 24min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:47 pm EST.

How many hours of sunshine does Lenni have in December?

The average sunshine duration in December is 5h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December in Lenni is 2. A UV Index 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
Lenni, PA

Average temperature in December - Lenni, PA
  • Average high temperature in December: 43.5°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 32.5°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).

Average pressure in December
Lenni, PA

Average pressure in December - Lenni, PA
  • Average pressure in December: 30.1"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
Lenni, PA

Average wind speed in December - Lenni, PA
  • Average wind speed in December: 8mph

The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Lenni, PA

Average humidity in December - Lenni, PA
  • Average humidity in December: 77%

The months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).

Average rainfall in December
Lenni, PA

Average rainfall in December - Lenni, PA
  • Average rainfall in December: 3.31"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (2.36").

Average rainfall days in December
Lenni, PA

Average rainfall days in December - Lenni, PA
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in December
Lenni, PA

Average snowfall in December - Lenni, PA
  • Average snowfall in December: 1.61"

The month with the highest snowfall is February (3.19").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Lenni, PA

Average snowfall days in December - Lenni, PA
  • Average snowfall days in December: 3.4 days

The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Lenni, 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: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Lenni, PA

Average sunshine days in December - Lenni, PA
  • Average sunshine days in December: 16.5 days

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (10 days).

Average UV index in December
Lenni, PA

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

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Lenni, PA

Average cloud cover in December - Lenni, PA
  • Average cloud cover in December: 47

The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Lenni, PA

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

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

Lenni, Pennsylvania, USA

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