December weather forecastErma, NJ
December
Weather in December
The first month of the winter, December, is also a frosty month in Erma, New Jersey, with an average temperature varying between 39.4°F (4.1°C) and 46.8°F (8.2°C).Temperature
Erma's weather in December involves a mild decrease in the average high-temperature, moving down slightly from November's cool 54.5°F (12.5°C) to a chilly 46.8°F (8.2°C). Consistently, Erma reports average nighttime temperatures of 39.4°F (4.1°C) during December, a marginal step down from its daytime highs.Humidity
In Erma, New Jersey, the average relative humidity in December is 75%.Rainfall
In December, the rain falls for 10.6 days. Throughout December, 3.15" (80mm) of precipitation is accumulated. Throughout the year, in Erma, there are 158 rainfall days, and 35.47" (901mm) of precipitation is accumulated.Snowfall
January through March and December are months with snowfall. The month with the most snowfall is December, when snow falls for 1.3 days and typically aggregates up to 1.06" (27mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year in Erma.On the first day of December, sunrise is at 7:00 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:47 pm EST.
Sunshine
In Erma, the average sunshine in December is 5.1h.UV index
The months with the lowest UV index in Erma are January, February and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Minimize direct exposure to the Sun during midday when its radiation is at its peak. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Erma, NJ
- Average high temperature in December: 46.8°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in December: 39.4°F
The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (32.2°F).
Average pressure in December
Erma, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Erma, NJ
- Average wind speed in December: 13mph
The windiest month (with the highest average wind speed) is January (13.5mph).
The calmest month (with the lowest average wind speed) is July (9.2mph).
Average humidity in December
Erma, NJ
- Average humidity in December: 75%
The month with the highest relative humidity is May (82%).
The month with the lowest relative humidity is November (73%).
Average rainfall in December
Erma, NJ
- Average rainfall in December: 3.15"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (2.13").
Average rainfall days in December
Erma, NJ
- Average rainfall days in December: 10.6 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in December
Erma, NJ
- Average snowfall in December: 1.06"
The month with the highest snowfall is December (1.06").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Erma, NJ
- Average snowfall days in December: 1.3 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Erma, NJ
- Average daylight in December: 9h and 30min
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 30min).
- Average sunshine in December: 5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Erma, NJ
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (18.9 days).
The months with the least sunshine days are May and June (12.5 days).
Average UV index in December
Erma, NJ
- Average UV index in December: 2
The months with the highest UV index are 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
Erma, NJ
- Average cloud cover in December: 45
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in December
Erma, 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).
