Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
A shift in the average high-temperature occurs in December in Johnstown, reducing from a frosty 46.6°F (8.1°C) in November to an icy 36.9°F (2.7°C). An average nighttime temperature of 26.1°F (-3.3°C) is witnessed throughout December.Humidity
In Johnstown, the average relative humidity in December is 85%.Rainfall
In Johnstown, in December, during 9.4 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 152.7 rainfall days, and 21.1" (536mm) of precipitation is accumulated.Snowfall
Months with snowfall in Johnstown are January through May, October through December. In Johnstown, during December, snow falls for 8.1 days and regularly aggregates up to 2.8" (71mm) of snow. In Johnstown, during the entire year, snow falls for 47.7 days and aggregates up to 18.23" (463mm) of snow.Daylight
The month with the shortest days in Johnstown is December, with an average of 9h and 24min of daylight.On the first day of December in Johnstown, 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.
Sunshine
The average sunshine in December in Johnstown is 3.4h.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 low health risk from exposure to the Sun's UV radiation for ordinary individuals.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. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Frequently asked questions
How cold is it in Johnstown in December?
What is the average humidity in December in Johnstown?
How many days does it rain in December in Johnstown?
How many days does it snow in December in Johnstown?
What is the month with the shortest days in Johnstown?
How many hours of daylight does Johnstown have in December?
When are sunrise and sunset in December in Johnstown?
How many hours of sunshine does Johnstown have in December?
What is the month with the lowest UV index in Johnstown?
What is the UV index intensity in December in Johnstown?
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in December /
Average sunshine in December
Johnstown, 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: 3h and 2min
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).
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).
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).
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).
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).
Johnstown, Pennsylvania, USA
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