December weather forecast
Emmaus, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Emmaus, Pennsylvania, with an average temperature ranging between max 40.1°F (4.5°C) and min 28.9°F (-1.7°C).

Temperature

The transition into December indicates a reduction in the average high-temperature, down to an icy 40.1°F (4.5°C) from November's frosty 49.8°F (9.9°C). In December, Emmaus experiences a temperature dip to an average of 28.9°F (-1.7°C) at night.

Humidity

In Emmaus, the average relative humidity in December is 81%.

Rainfall

In Emmaus, Pennsylvania, in December, it is raining for 9.2 days, with typically 2.32" (59mm) of accumulated precipitation. In Emmaus, during the entire year, the rain falls for 145.1 days and collects up to 27.24" (692mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Emmaus, in December, during 2.5 snowfall days, 2.28" (58mm) of snow is typically accumulated. In Emmaus, Pennsylvania, during the entire year, snow falls for 20.4 days and aggregates up to 13.82" (351mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:45 pm EST.

Sunshine

In Emmaus, the average sunshine in December is 4.7h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard 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:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

In December, the average high-temperature and low-temperature are 40.1°F (4.5°C) and 28.9°F (-1.7°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is appraised at 86°F (30°C).

What is the average humidity in December?

In Emmaus, the average relative humidity in December is 81%.

How much does it rain in December?

In Emmaus, in December, it is raining for 9.2 days, with typically 2.32" (59mm) of accumulated precipitation.

How many days does it snow in December in Emmaus?

In Emmaus, in December, snow falls for 2.5 days, with typically accumulated 2.28" (58mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In Emmaus, the average day length in December is 9h and 20min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:45 pm EST.

How many hours of sunshine does Emmaus have in December?

The average sunshine duration in December is 4.7h.

What are the months with the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Emmaus, PA

Average temperature in December - Emmaus, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Emmaus, PA

Average pressure in December - Emmaus, 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
Emmaus, PA

Average wind speed in December - Emmaus, 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
Emmaus, PA

Average humidity in December - Emmaus, PA
  • Average humidity in December: 81%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in December
Emmaus, PA

Average rainfall in December - Emmaus, PA
  • Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.61").

Average rainfall days in December
Emmaus, PA

Average rainfall days in December - Emmaus, PA
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.7 days).

Average snowfall in December
Emmaus, PA

Average snowfall in December - Emmaus, PA
  • Average snowfall in December: 2.28"

The month with the highest snowfall is March (4.37").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Emmaus, PA

Average snowfall days in December - Emmaus, PA
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is February (6.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Emmaus, 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 18min).

  • 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 24min).

Average sunshine days in December
Emmaus, PA

Average sunshine days in December - Emmaus, PA
  • Average sunshine days in December: 19.2 days

The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in December
Emmaus, PA

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

The months with the highest UV index are 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
Emmaus, PA

Average cloud cover in December - Emmaus, PA
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in December
Emmaus, PA

Average visibility in December - Emmaus, PA
  • Average visibility in December: 5mi

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

Emmaus, Pennsylvania, USA

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