December weather forecast
Johnstown, PA

Weather in December

December, the first month of the winter in Johnstown, is also a wintry month, with an average temperature fluctuating between 26.1°F (-3.3°C) and 36.9°F (2.7°C).

Temperature

In December, the average high-temperature decreases from a chilly 46.6°F (8.1°C) in November to a cold 36.9°F (2.7°C). In Johnstown, the average low-temperature is 26.1°F (-3.3°C).

Humidity

The average relative humidity in December in Johnstown is 85%.

Rainfall

In Johnstown, Pennsylvania, in December, it is raining for 9.4 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 152.7 rainfall days, and 21.1" (536mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In December, in Johnstown, it is snowing for 8.1 days. Throughout December, 2.8" (71mm) of snow is accumulated. Throughout the year, there are 47.7 snowfall days, and 18.23" (463mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Johnstown, with an average of 9h and 21min of daylight.
On the first day of the month, sunrise is at 7:19 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:59 pm EST.

Sunshine

The average sunshine in December in Johnstown is 3.4h.

UV index

December is the month with the lowest UV index in Johnstown, Pennsylvania, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 1 in December interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Johnstown?

In December, the average high-temperature is 36.9°F (2.7°C), and the average low-temperature is 26.1°F (-3.3°C).

What is the average humidity in December in Johnstown?

The average relative humidity in December in Johnstown, Pennsylvania, is 85%.

How many days does it rain in December in Johnstown?

In December, the rain falls for 9.4 days. Throughout December, 1.85" (47mm) of precipitation is accumulated.

How many days does it snow in December in Johnstown?

In December, in Johnstown, Pennsylvania, it is snowing for 8.1 days. Throughout December, 2.8" (71mm) of snow is accumulated.

What is the month with the shortest days in Johnstown?

December has the shortest days of the year, with an average of 9h and 21min of daylight.

What is the average length of the day in December in Johnstown?

In December, the average day length is 9h and 21min.

What time are sunrise and sunset in December in Johnstown?

On the first day of December, sunrise is at 7:19 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:59 pm EST.

How many hours of sunshine does Johnstown have in December?

In Johnstown, the average sunshine duration in December is 3.4h.

When is the lowest UV index in Johnstown?

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

What is the UV index reading in December in Johnstown?

In Johnstown, Pennsylvania, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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
Johnstown, PA

Average temperature in December - Johnstown, PA
  • Average high temperature in December: 36.9°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in December: 26.1°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 (18.9°F).

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Average pressure in December
Johnstown, PA

Average pressure in December - Johnstown, PA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in December
Johnstown, PA

Average wind speed in December - Johnstown, PA
  • Average wind speed in December: 9.4mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

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Average humidity in December
Johnstown, PA

Average humidity in December - Johnstown, PA
  • Average humidity in December: 85%

The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is July (78%).

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Average rainfall in December
Johnstown, PA

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

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is November (1.1").

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Average rainfall days in December
Johnstown, PA

Average rainfall days in December - Johnstown, PA
  • Average rainfall days in December: 9.4 days

The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (6.8 days).

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Average snowfall in December
Johnstown, PA

Average snowfall in December - Johnstown, PA
  • Average snowfall in December: 2.8"

The month with the highest snowfall is March (4.21").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Johnstown, PA

Average snowfall days in December - Johnstown, PA
  • Average snowfall days in December: 8.1 days

The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Johnstown, PA
  • Average daylight in December: 9h and 21min

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 21min).

  • Average sunshine in December: 3h and 24min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

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Average sunshine days in December
Johnstown, PA

Average sunshine days in December - Johnstown, PA
  • Average sunshine days in December: 15.4 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (9 days).

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Average UV index in December
Johnstown, PA

Average UV index in December - Johnstown, 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).

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Average cloud cover in December
Johnstown, PA

Average cloud cover in December - Johnstown, PA
  • Average cloud cover in December: 67

The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is August (Cloud cover 39).

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Average visibility in December
Johnstown, PA

Average visibility in December - Johnstown, 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).

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