December weather forecast
Pleasant Hill, PA

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Weather in December

The first month of the winter, December, is still a cold month in Pleasant Hill, Pennsylvania, with temperature in the range of an average low of 29.3°F (-1.5°C) and an average high of 40.3°F (4.6°C).

Temperature

As December commences, the average high-temperature shows a reduction, transitioning from a frosty 49.5°F (9.7°C) in November to an icy 40.3°F (4.6°C). Pleasant Hill's temperature tends to fall to an average low of 29.3°F (-1.5°C) during the nights of December.

Humidity

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

Rainfall

In Pleasant Hill, in December, it is raining for 9.2 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, there are 137.4 rainfall days, and 16.26" (413mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Pleasant Hill, during December, snow falls for 3.3 days and regularly aggregates up to 0.98" (25mm) of snow. Throughout the year, there are 19.5 snowfall days, and 6.69" (170mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:49 pm EST.

Sunshine

In Pleasant Hill, the average sunshine in December 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 estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A daily high UV index of 2 in December leads to these guidelines:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In Pleasant Hill, 40.3°F (4.6°C) is the average high-temperature and 29.3°F (-1.5°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in July is appraised at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 80%.

How many days does it rain in December?

In Pleasant Hill, Pennsylvania, during December, the rain falls for 9.2 days and regularly aggregates up to 1.1" (28mm) of precipitation.

How many days does it snow in December?

In Pleasant Hill, in December, during 3.3 snowfall days, 0.98" (25mm) of snow is typically accumulated.

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.

What is the average length of the day in December in Pleasant Hill?

In Pleasant Hill, the average day length in December is 9h and 21min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:49 pm EST.

How many hours of sunshine does Pleasant Hill have in December?

In December, the average sunshine duration is 4.6h.

What is the month with 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.

How high is the UV index in December?

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

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

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 29.3°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Pleasant Hill, PA

Average pressure in December - Pleasant Hill, 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).

Average wind speed in December
Pleasant Hill, PA

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

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Pleasant Hill, PA

Average humidity in December - Pleasant Hill, PA
  • Average humidity in December: 80%

The months with the highest relative humidity are February, May and October (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Pleasant Hill, PA

Average rainfall in December - Pleasant Hill, PA
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is August (2.13").
The driest month (with the least rainfall) is February (0.94").

Average rainfall days in December
Pleasant Hill, PA

Average rainfall days in December - Pleasant Hill, PA
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (6.7 days).

Average snowfall in December
Pleasant Hill, PA

Average snowfall in December - Pleasant Hill, PA
  • Average snowfall in December: 0.98"

The month with the highest snowfall is January (1.97").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Pleasant Hill, PA

Average snowfall days in December - Pleasant Hill, PA
  • Average snowfall days in December: 3.3 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Pleasant Hill, PA

Average daylight in December / Average sunshine in December - Pleasant Hill, 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).

Average sunshine days in December
Pleasant Hill, PA

Average sunshine days in December - Pleasant Hill, PA
  • Average sunshine days in December: 18.7 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is May (11.5 days).

Average UV index in December
Pleasant Hill, PA

Average UV index in December - Pleasant Hill, 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, March, November and December (UV index 2).

Average cloud cover in December
Pleasant Hill, PA

Average cloud cover in December - Pleasant Hill, PA
  • Average cloud cover in December: 51

The months with the most cloud cover are February and December (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Pleasant Hill, PA

Average visibility in December - Pleasant Hill, PA
  • Average visibility in December: 6mi

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

Pleasant Hill, Pennsylvania, USA

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