December weather forecastJohnsontown, NJ
December
Weather in December
The first month of the winter, December, is also a frosty month in Johnsontown, New Jersey, with an average temperature fluctuating between 37°F (2.8°C) and 46°F (7.8°C).Temperature
Johnsontown's December weather features a light decline in high-temperatures, reducing from a cool 53.6°F (12°C) in November to a chilly 46°F (7.8°C). Johnsontown observes a consistent average low-temperature of 37°F (2.8°C) throughout December nights.Humidity
The average relative humidity in December is 76%.Rainfall
The month with the most rainfall in Johnsontown is December, when the rain falls for 5.5 days and typically aggregates up to 0.75" (19mm) of precipitation.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows. Throughout December, in the average 1 snowfall days, it receives 0.08" (2mm) of snow. In Johnsontown, during the entire year, snow falls for 6 days and aggregates up to 0.59" (15mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:59 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:44 pm EST.
Sunshine
The average sunshine in December is 5.2h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Johnsontown, NJ
- Average high temperature in December: 46°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (39.9°F).
- Average low temperature in December: 37°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in December
Johnsontown, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Johnsontown, NJ
- Average wind speed in December: 11.1mph
The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in December
Johnsontown, NJ
- Average humidity in December: 76%
The months with the highest relative humidity are May and June (80%).
The months with the lowest relative humidity are January, March, April and November (74%).
Average rainfall in December
Johnsontown, NJ
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is December (0.75").
The driest month (with the least rainfall) is September (0.28").
Average rainfall days in December
Johnsontown, NJ
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is July (10.3 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Johnsontown, NJ
- Average snowfall in December: 0.08"
The month with the highest snowfall is January (0.2").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Johnsontown, NJ
- Average snowfall days in December: 1 days
The month with the highest number of snowfall days is January (1.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Johnsontown, NJ
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Johnsontown, NJ
- Average sunshine days in December: 23.6 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is August (18.2 days).
Average UV index in December
Johnsontown, NJ
- 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 and December (UV index 2).
Average cloud cover in December
Johnsontown, NJ
- Average cloud cover in December: 45
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Johnsontown, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
