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
The transition to December results in a modest reduction in average high-temperature, moving from a fresh 53.6°F (12°C) in November to a chilly 46°F (7.8°C). Johnsontown observes a minimal variance in temperature, with a consistent average low of 37°F (2.8°C) during the nights of December.Humidity
In Johnsontown, the average relative humidity in December is 76%.Rainfall
December is the month with the most rainfall in Johnsontown, New Jersey. Rain falls for 5.5 days and accumulates 0.75" (19mm) of precipitation.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows in Johnsontown. Throughout December, in the average 1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 6 snowfall days, and 0.59" (15mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.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, in Johnsontown, sunrise is at 7:18 am and sunset at 4:44 pm EST.
Sunshine
In December, the average sunshine is 5.2h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
What is the temperature in December in Johnsontown?
What is the average humidity in December in Johnsontown?
What is the rainiest month in Johnsontown?
How much does it rain in Johnsontown in December?
When does it start to snow in Johnsontown?
What is the month with the shortest days in Johnsontown?
How many hours of daylight does Johnsontown have in December?
When are sunrise and sunset in December in Johnsontown?
How many hours of sunshine does Johnsontown have in December?
When is the lowest UV index in Johnsontown?
What is the UV index intensity in December in Johnsontown?
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 2min
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 1min
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).
Johnsontown, New Jersey, USA
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