December weather forecast
Walnut Hill, PA

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Weather in December

The first month of the winter, December, is still a chilly month in Walnut Hill, Pennsylvania, with an average temperature fluctuating between 43°F (6.1°C) and 31.8°F (-0.1°C).

Temperature

A subtle decrease in the average high-temperature marks December, falling from November's cool 52°F (11.1°C) to a frosty 43°F (6.1°C). The mean low-temperature during December nights is a subzero cold 31.8°F (-0.1°C).

Humidity

In Walnut Hill, the average relative humidity in December is 78%.

Rainfall

In December, the rain falls for 9.4 days. Throughout December, 1.54" (39mm) of precipitation is accumulated. Throughout the year, there are 135 rainfall days, and 17.76" (451mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In December, it is snowing for 2.4 days. Throughout December, 0.79" (20mm) of snow is accumulated. In Walnut Hill, during the entire year, snow falls for 16.6 days and aggregates up to 5.47" (139mm) of snow.

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 7:03 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:45 pm EST.

Sunshine

In Walnut Hill, the average sunshine in December is 5h.

UV index

The months with the lowest UV index in Walnut Hill are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 2 in December transforms into the following instructions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Updated: Aug 20, 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, in December, in Walnut Hill, records 43°F (6.1°C), while the low-temperature is 31.8°F (-0.1°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is computed to be 89.6°F (32°C).

What is the average humidity in December?

In Walnut Hill, the average relative humidity in December is 78%.

How much does it rain in December?

In December, the rain falls for 9.4 days. Throughout December, 1.54" (39mm) of precipitation is accumulated.

How many days does it snow in December?

In Walnut Hill, in December, snow falls for 2.4 days, with typically accumulated 0.79" (20mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Walnut Hill have in December?

In Walnut Hill, the average day length in December is 9h and 23min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:45 pm EST.

How many hours of sunshine does Walnut Hill have in December?

In December, the average sunshine duration is 5h.

What are the months with the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index estimate 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
Walnut Hill, PA

Average temperature in December - Walnut Hill, PA
  • Average high temperature in December: 43°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in December: 31.8°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in December
Walnut Hill, PA

Average pressure in December - Walnut Hill, 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
Walnut Hill, PA

Average wind speed in December - Walnut Hill, PA
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are January, February and March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
Walnut Hill, PA

Average humidity in December - Walnut Hill, PA
  • Average humidity in December: 78%

The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (74%).

Average rainfall in December
Walnut Hill, PA

Average rainfall in December - Walnut Hill, PA
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is August (2.36").
The driest month (with the least rainfall) is November (1.06").

Average rainfall days in December
Walnut Hill, PA

Average rainfall days in December - Walnut Hill, PA
  • Average rainfall days in December: 9.4 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is January (6.6 days).

Average snowfall in December
Walnut Hill, PA

Average snowfall in December - Walnut Hill, PA
  • Average snowfall in December: 0.79"

The month with the highest snowfall is March (1.5").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Walnut Hill, PA

Average snowfall days in December - Walnut Hill, PA
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Walnut Hill, PA

Average daylight in December / Average sunshine in December - Walnut Hill, 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: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Walnut Hill, PA

Average sunshine days in December - Walnut Hill, PA
  • Average sunshine days in December: 19.5 days

The month with the most sunshine days is November (21 days).
The month with the least sunshine days is July (12.8 days).

Average UV index in December
Walnut Hill, PA

Average UV index in December - Walnut Hill, 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, November and December (UV index 2).

Average cloud cover in December
Walnut Hill, PA

Average cloud cover in December - Walnut Hill, PA
  • Average cloud cover in December: 46

The months with the most cloud cover are February, March and May (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Walnut Hill, PA

Average visibility in December - Walnut Hill, 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).

Walnut Hill, Pennsylvania, USA

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