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
December suggests a modest reduction in the average high-temperature, shifting from a frosty 49.3°F (9.6°C) in November to a cold 39.9°F (4.4°C). Ironia, during the nights of December, experiences an average temperature drop to a freezing cold 28.2°F (-2.1°C).Humidity
In December, the average relative humidity is 80%.Rainfall
The month with the most rainfall is December, when the rain falls for 11.1 days and typically aggregates up to 3.27" (83mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Ironia, during December, snow falls for 5.2 days and regularly aggregates up to 3.5" (89mm) of snow. Throughout the year, there are 34.7 snowfall days, and 20.71" (526mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:40 pm EST.
Sunshine
The average sunshine in December is 4.8h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
What is the rainiest month?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Ironia have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December in Ironia?
Average temperature in December
Ironia, NJ
- Average high temperature in December: 39.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in December
Ironia, NJ
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Ironia, NJ
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in December
Ironia, NJ
- Average humidity in December: 80%
The months with the highest relative humidity are February and October (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Ironia, NJ
- Average rainfall in December: 3.27"
The wettest month (with the highest rainfall) is December (3.27").
The driest month (with the least rainfall) is September (1.02").
Average rainfall days in December
Ironia, NJ
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Ironia, NJ
- Average snowfall in December: 3.5"
The month with the highest snowfall is March (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Ironia, NJ
- Average snowfall days in December: 5.2 days
The month with the highest number of snowfall days is February (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Ironia, NJ
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Ironia, NJ
- Average sunshine days in December: 16.2 days
The month with the most sunshine days is September (19.6 days).
The month with the least sunshine days is April (12.3 days).
Average UV index in December
Ironia, NJ
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Ironia, NJ
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Ironia, NJ
- Average visibility in December: 6mi
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
Ironia, New Jersey, USA
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