December weather forecast
South Coatesville, PA

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Weather in December

December, the first month of the winter in South Coatesville, is still a cold month, with an average temperature ranging between min 30.6°F (-0.8°C) and max 41.9°F (5.5°C).

Temperature

South Coatesville's December weather comes with a decrease in average high-temperatures, moving from a cool 50.9°F (10.5°C) in November to a cold 41.9°F (5.5°C). South Coatesville reports an average nighttime low-temperature of 30.6°F (-0.8°C) in December.

Humidity

The average relative humidity in December in South Coatesville is 80%.

Rainfall

In South Coatesville, during December, the rain falls for 8.7 days and regularly aggregates up to 1.54" (39mm) of precipitation. In South Coatesville, during the entire year, the rain falls for 138.3 days and collects up to 19.76" (502mm) of precipitation.

Snowfall

Months with snowfall in South Coatesville are January through May, October through December. In South Coatesville, in December, snow falls for 2.7 days, with typically accumulated 1.14" (29mm) of snow. Throughout the year, there are 19.6 snowfall days, and 7.64" (194mm) 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 7:06 am and sunset at 4:38 pm. On the last day of December, in South Coatesville, sunrise is at 7:24 am and sunset at 4:48 pm EST.

Sunshine

In December, the average sunshine is 4.7h.

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 of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 2 during December leads to these instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold in South Coatesville during December?

The high-temperature in South Coatesville during December is 41.9°F (5.5°C) and the low-temperature is 30.6°F (-0.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 86°F (30°C).

What is the average humidity in December in South Coatesville?

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

How many days does it rain in December in South Coatesville?

In South Coatesville, Pennsylvania, in December, during 8.7 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

How many days does it snow in December in South Coatesville?

In South Coatesville, Pennsylvania, in December, snow falls for 2.7 days, with typically accumulated 1.14" (29mm) of snow.

What is the month with the shortest days in South Coatesville?

With an average of 9h and 24min of daylight, December has the shortest days of the year in South Coatesville, Pennsylvania.

How many hours of daylight does South Coatesville have in December?

In December, the average day length in South Coatesville, Pennsylvania, is 9h and 23min.

What time are sunrise and sunset in December in South Coatesville?

On the first day of December in South Coatesville, sunrise is at 7:06 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:48 pm EST.

How many hours of sunshine does South Coatesville have in December?

The average sunshine duration in December in South Coatesville, Pennsylvania, is 4.7h.

When is the lowest UV index in South Coatesville?

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

How high is the UV index in December in South Coatesville?

The average daily maximum UV index in December in South Coatesville, Pennsylvania, is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
South Coatesville, PA

Average temperature in December - South Coatesville, PA
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in December: 30.6°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

Average pressure in December
South Coatesville, PA

Average pressure in December - South Coatesville, 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
South Coatesville, PA

Average wind speed in December - South Coatesville, PA
  • Average wind speed in December: 8.3mph

The windiest months (with the highest average wind speed) are January, February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
South Coatesville, PA

Average humidity in December - South Coatesville, PA
  • Average humidity in December: 80%

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

Average rainfall in December
South Coatesville, PA

Average rainfall in December - South Coatesville, PA
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is August (2.72").
The driest month (with the least rainfall) is February (1.14").

Average rainfall days in December
South Coatesville, PA

Average rainfall days in December - South Coatesville, PA
  • Average rainfall days in December: 8.7 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (6.4 days).

Average snowfall in December
South Coatesville, PA

Average snowfall in December - South Coatesville, PA
  • Average snowfall in December: 1.14"

The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
South Coatesville, PA

Average snowfall days in December - South Coatesville, PA
  • Average snowfall days in December: 2.7 days

The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
South Coatesville, PA

Average daylight in December / Average sunshine in December - South Coatesville, 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
South Coatesville, PA

Average sunshine days in December - South Coatesville, PA
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is July (12.4 days).

Average UV index in December
South Coatesville, PA

Average UV index in December - South Coatesville, 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, March, November and December (UV index 2).

Average cloud cover in December
South Coatesville, PA

Average cloud cover in December - South Coatesville, 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).

Average visibility in December
South Coatesville, PA

Average visibility in December - South Coatesville, 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).

South Coatesville, Pennsylvania, USA

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