December weather forecast
Exeter, PA

Share

Weather in December

The first month of the winter, December, is also a wintry month in Exeter, Pennsylvania, with an average temperature fluctuating between 25.9°F (-3.4°C) and 36.5°F (2.5°C).

Temperature

In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 46.2°F (7.9°C) in November to a cold 36.5°F (2.5°C). December's average low-temperature reading settles at a subzero cold 25.9°F (-3.4°C).

Humidity

February and December, with an average relative humidity of 84%, are the most humid months in Exeter.

Rainfall

In Exeter, during December, the rain falls for 11 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Exeter, during the entire year, the rain falls for 162.1 days and collects up to 24.53" (623mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Exeter. In December, it is snowing for 9.6 days. Throughout December, 3.46" (88mm) of snow is accumulated. In Exeter, during the entire year, snow falls for 49.4 days and aggregates up to 19.92" (506mm) 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 7:10 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:44 pm EST.

Sunshine

The average sunshine in December is 3.8h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In December, an average UV index of 1 transforms into the following instructions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.

Frequently asked questions

How cold is December in Exeter?

In December, the average high-temperature and low-temperature are 36.5°F (2.5°C) and 25.9°F (-3.4°C) respectively. The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in July is calculated to be 86°F (30°C).

What are the most humid months?

The months with the highest humidity are February and December, with an average relative humidity of 84%.

What is the average humidity in December?

In Exeter, the average relative humidity in December is 84%.

How much does it rain in December?

In Exeter, during December, the rain falls for 11 days and regularly aggregates up to 1.73" (44mm) of precipitation.

How much does it snow in December?

In Exeter, during December, snow falls for 9.6 days and regularly aggregates up to 3.46" (88mm) 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 December, the average day length is 9h and 15min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:44 pm EST.

How many hours of sunshine does Exeter have in December?

The average sunshine duration in December is 3.8h.

When is the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 1.

What is the UV index intensity in December?

In Exeter, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a low health threat 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
Exeter, PA

Average temperature in December - Exeter, PA
  • Average high temperature in December: 36.5°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.4°F).

  • Average low temperature in December: 25.9°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

Average pressure in December
Exeter, PA

Average pressure in December - Exeter, 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
Exeter, PA

Average wind speed in December - Exeter, PA
  • Average wind speed in December: 7.6mph

The windiest months (with the highest average wind speed) are March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Exeter, PA

Average humidity in December - Exeter, PA
  • Average humidity in December: 84%

The months with the highest relative humidity are February and December (84%).
The months with the lowest relative humidity are April, June and July (78%).

Average rainfall in December
Exeter, PA

Average rainfall in December - Exeter, PA
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is July (2.6").
The driest month (with the least rainfall) is September (1.54").

Average rainfall days in December
Exeter, PA

Average rainfall days in December - Exeter, PA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in December
Exeter, PA

Average snowfall in December - Exeter, PA
  • Average snowfall in December: 3.46"

The month with the highest snowfall is February (5.87").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Exeter, PA

Average snowfall days in December - Exeter, PA
  • Average snowfall days in December: 9.6 days

The month with the highest number of snowfall days is January (13.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Exeter, PA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).

Average sunshine days in December
Exeter, PA

Average sunshine days in December - Exeter, PA
  • Average sunshine days in December: 13.5 days

The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is July (10.3 days).

Average UV index in December
Exeter, PA

Average UV index in December - Exeter, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Exeter, PA

Average cloud cover in December - Exeter, PA
  • Average cloud cover in December: 61

The months with the most cloud cover are January, February and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in December
Exeter, PA

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

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

Exeter, Pennsylvania, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location