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 into December involves a decrease in the average high-temperature, falling from a cool 50.4°F (10.2°C) in November to a wintry 41.2°F (5.1°C). Throughout the month of December, the nighttime temperature dips to an average of 29.7°F (-1.3°C).Humidity
In December, the average relative humidity in Lyons is 79%.Rainfall
In Lyons, during December, the rain falls for 9.9 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, in Lyons, there are 155.7 rainfall days, and 27.64" (702mm) of precipitation is accumulated.Snowfall
Months with snowfall in Lyons are January through May, November and December. In Lyons, during December, snow falls for 3.7 days and regularly aggregates up to 1.34" (34mm) of snow. Throughout the year, in Lyons, there are 24.7 snowfall days, and 10.83" (275mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Lyons, New Jersey.On the first day of the month, sunrise is at 7:03 am and sunset at 4:31 pm. On the last day of December, in Lyons, sunrise is at 7:21 am and sunset at 4:41 pm EST.
Sunshine
In December, the average sunshine in Lyons, New Jersey, is 4.8h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Lyons. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Lyons in December?
What is the average humidity in December in Lyons?
How much does it rain in Lyons in December?
How many days does it snow in December in Lyons?
What is the month with the shortest days in Lyons?
What is the average length of the day in December in Lyons?
When are sunrise and sunset in December in Lyons?
How many hours of sunshine does Lyons have in December?
What is the month with the lowest UV index in Lyons?
What is the UV index intensity in December in Lyons?
Average temperature in December
Lyons, NJ
- Average high temperature in December: 41.2°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in December: 29.7°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Lyons, 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
Lyons, NJ
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in December
Lyons, NJ
- Average humidity in December: 79%
The months with the highest relative humidity are February and October (80%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Lyons, NJ
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is July (3.11").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in December
Lyons, NJ
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Lyons, NJ
- Average snowfall in December: 1.34"
The month with the highest snowfall is March (4.09").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Lyons, NJ
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Lyons, NJ
- 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 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Lyons, NJ
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in December
Lyons, 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, March, November and December (UV index 2).
Average cloud cover in December
Lyons, NJ
- Average cloud cover in December: 49
The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Lyons, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, July, August, October, November and December (6mi).
The months with the lowest visibility are May, June and September (5mi).
Lyons, New Jersey, USA
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