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
Arrival of December comes with a reduction in the average high-temperature, falling from a chilly 48.6°F (9.2°C) in November to a wintry 38.7°F (3.7°C). In December, Johnstown reports a consistent average low-temperature of 28.4°F (-2°C) during the nights.Humidity
The average relative humidity in December in Johnstown, Ohio, is 82%.Rainfall
In Johnstown, in December, it is raining for 12.5 days, with typically 2.56" (65mm) of accumulated precipitation. Throughout the year, in Johnstown, there are 176.7 rainfall days, and 33.7" (856mm) of precipitation is accumulated.Snowfall
Months with snowfall in Johnstown are January through May, October through December. In Johnstown, during December, snow falls for 9.9 days and regularly aggregates up to 3.15" (80mm) of snow. Throughout the year, there are 47.1 snowfall days, and 15.43" (392mm) of snow is accumulated.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, sunrise is at 7:34 am and sunset at 5:05 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 5:15 pm EST.
Sunshine
In December, the average sunshine in Johnstown is 3.9h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index, 2 during December, leads to the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Johnstown?
What is the average humidity in December in Johnstown?
How many days does it rain in December in Johnstown?
How much does it snow in Johnstown in December?
What is the month with the shortest days in Johnstown?
What is the average length of the day in December in Johnstown?
When are sunrise and sunset in December in Johnstown?
How long on average sun shines in December in Johnstown?
When is the lowest UV index in Johnstown?
How high is the UV index in December in Johnstown?
Average temperature in December
Johnstown, OH
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Johnstown, OH
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Johnstown, OH
- Average wind speed in December: 9mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
Average humidity in December
Johnstown, OH
- Average humidity in December: 82%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is November (76%).
Average rainfall in December
Johnstown, OH
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is May (3.86").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Johnstown, OH
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is May (20.2 days).
The month with the least rainy days is February (9.6 days).
Average snowfall in December
Johnstown, OH
- Average snowfall in December: 3.15"
The month with the highest snowfall is January (4.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Johnstown, OH
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is January (13.9 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, OH
- 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 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Johnstown, OH
- Average sunshine days in December: 12.1 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is May (8.2 days).
Average UV index in December
Johnstown, OH
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Johnstown, OH
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Johnstown, OH
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, October, November and December (6mi).
The months with the lowest visibility are January, February and September (5mi).
Johnstown, Ohio, USA
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