December weather forecast
Boyertown, PA

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Weather in December

December, the first month of the winter in Boyertown, is also a wintry month, with an average temperature ranging between max 41.5°F (5.3°C) and min 30.4°F (-0.9°C).

Temperature

In Boyertown, the average high-temperature in December drops from a fresh 50.9°F (10.5°C) in November to a wintry 41.5°F (5.3°C). Boyertown's average low-temperature in the month of December is recorded at a subzero cold 30.4°F (-0.9°C).

Humidity

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

Rainfall

In Boyertown, in December, it is raining for 8 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, there are 128.6 rainfall days, and 15.16" (385mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In Boyertown, during December, snow falls for 2 days and regularly aggregates up to 1.34" (34mm) of snow. In Boyertown, during the entire year, snow falls for 17 days and aggregates up to 5.43" (138mm) of snow.

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 7:06 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:46 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

The high-temperature during December is 41.5°F (5.3°C) and the low-temperature is 30.4°F (-0.9°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is estimated at 87.8°F (31°C).

What is the average humidity in December?

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

How many days does it rain in December?

In December, the rain falls for 8 days. Throughout December, 1.34" (34mm) of precipitation is accumulated.

How many days does it snow in December?

In Boyertown, during December, snow falls for 2 days and regularly aggregates up to 1.34" (34mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December is 9h and 21min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:46 pm EST.

How many hours of sunshine does Boyertown have in December?

In December, the average sunshine duration is 4.8h.

What is the month with the lowest UV index in Boyertown?

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

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from 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
Boyertown, PA

Average temperature in December - Boyertown, PA
  • Average high temperature in December: 41.5°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 30.4°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure in December
Boyertown, PA

Average pressure in December - Boyertown, PA
  • Average pressure in December: 30.09"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
Boyertown, PA

Average wind speed in December - Boyertown, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Boyertown, PA

Average humidity in December - Boyertown, PA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (75%).

Average rainfall in December
Boyertown, PA

Average rainfall in December - Boyertown, PA
  • Average rainfall in December: 1.34"

The wettest month (with the highest rainfall) is July (1.97").
The driest month (with the least rainfall) is January (0.87").

Average rainfall days in December
Boyertown, PA

Average rainfall days in December - Boyertown, PA
  • Average rainfall days in December: 8 days

The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is January (5.7 days).

Average snowfall in December
Boyertown, PA

Average snowfall in December - Boyertown, PA
  • Average snowfall in December: 1.34"

The month with the highest snowfall is March (1.46").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Boyertown, PA

Average snowfall days in December - Boyertown, PA
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Boyertown, 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 5min

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 36min).

Average sunshine days in December
Boyertown, PA

Average sunshine days in December - Boyertown, PA
  • Average sunshine days in December: 20.1 days

The month with the most sunshine days is November (21.4 days).
The month with the least sunshine days is July (12.8 days).

Average UV index in December
Boyertown, PA

Average UV index in December - Boyertown, 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
Boyertown, PA

Average cloud cover in December - Boyertown, 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 32).

Average visibility in December
Boyertown, PA

Average visibility in December - Boyertown, 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).

Boyertown, Pennsylvania, USA

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