December weather forecast
Ketcham, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Ketcham, Pennsylvania, with an average temperature fluctuating between 25.7°F (-3.5°C) and 36.1°F (2.3°C).

Temperature

December ushers in a slight temperature change, with average high-temperatures reducing from November's frosty 45.7°F (7.6°C) to a wintry 36.1°F (2.3°C). In December, Ketcham reports a consistent average low-temperature of 25.7°F (-3.5°C) during the nights.

Humidity

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

Rainfall

In Ketcham, Pennsylvania, in December, during 10.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 154.5 rainfall days, and 25.63" (651mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Ketcham, in December, snow falls for 11.6 days, with typically accumulated 3.9" (99mm) of snow. In Ketcham, Pennsylvania, during the entire year, snow falls for 58.2 days and aggregates up to 26.1" (663mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:10 am and sunset at 4:35 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 in Ketcham is 3.8h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum high daily UV index of 1 during December translates into the following directions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Jul 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

An average high-temperature, in December, in Ketcham, is 36.1°F (2.3°C) and the average low-temperature is 25.7°F (-3.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in July is appraised at 86°F (30°C).

What is the most humid month?

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

What is the average humidity in December?

The average relative humidity in December is 84%.

How much does it rain in December?

In December, the rain falls for 10.5 days. Throughout December, 1.85" (47mm) of precipitation is accumulated.

How much does it snow in December?

In Ketcham, in December, snow falls for 11.6 days, with typically accumulated 3.9" (99mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

How many hours of daylight does Ketcham have in December?

In Ketcham, the average day length in December is 9h and 15min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In Ketcham, the average sunshine duration in December is 3.8h.

When is the lowest UV index?

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

What is the UV index intensity in December?

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

Average temperature in December - Ketcham, PA
  • Average high temperature in December: 36.1°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°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

Average pressure in December
Ketcham, PA

Average pressure in December - Ketcham, 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
Ketcham, PA

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

The windiest months (with the highest average wind speed) are March and April (8mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Ketcham, PA

Average humidity in December - Ketcham, 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
Ketcham, PA

Average rainfall in December - Ketcham, PA
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is August (2.48").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in December
Ketcham, PA

Average rainfall days in December - Ketcham, PA
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.6 days).

Average snowfall in December
Ketcham, PA

Average snowfall in December - Ketcham, PA
  • Average snowfall in December: 3.9"

The month with the highest snowfall is February (7.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Ketcham, PA

Average snowfall days in December - Ketcham, PA
  • Average snowfall days in December: 11.6 days

The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Ketcham, PA
  • Average daylight in December: 9h and 1min

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 12min).

  • Average sunshine in December: 3h and 5min

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

Average sunshine days in December
Ketcham, PA

Average sunshine days in December - Ketcham, PA
  • Average sunshine days in December: 12 days

The month with the most sunshine days is September (15.6 days).
The month with the least sunshine days is April (10.3 days).

Average UV index in December
Ketcham, PA

Average UV index in December - Ketcham, 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
Ketcham, PA

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

The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in December
Ketcham, PA

Average visibility in December - Ketcham, 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).

Ketcham, Pennsylvania, USA

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