December weather forecastCopiague, NY
December
Weather in December
December, the first month of the winter in Copiague, is still a chilly month, with an average temperature varying between 37°F (2.8°C) and 44.1°F (6.7°C).Temperature
The transition into December subtly indicates a reduction in the average high-temperature, down to a chilly 44.1°F (6.7°C) from November's cool 52.2°F (11.2°C). A steady low-temperature average of 37°F (2.8°C) is logged during December, reflecting a modest dip from daytime readings.Humidity
In December, the average relative humidity in Copiague is 74%.Rainfall
In Copiague, in December, during 12.6 rainfall days, 3.27" (83mm) of precipitation is typically accumulated. Throughout the year, there are 158.8 rainfall days, and 31.38" (797mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In December, in Copiague, it is snowing for 2.7 days. Throughout December, 0.59" (15mm) of snow is accumulated. In Copiague, during the entire year, snow falls for 16.8 days and aggregates up to 4.17" (106mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:58 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:36 pm EST.
Sunshine
The average sunshine in December is 4.9h.UV index
The months with the lowest UV index are January through March and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the UV index of 2 transforms into the following advice:
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. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality 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
Average temperature in December
Copiague, NY
- Average high temperature in December: 44.1°F
The warmest months (with the highest average high temperature) are July and August (78.4°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 37°F
The months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).
Average pressure in December
Copiague, NY
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Copiague, NY
- Average wind speed in December: 13.4mph
The windiest month (with the highest average wind speed) is January (13.9mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).
Average humidity in December
Copiague, NY
- Average humidity in December: 74%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is November (71%).
Average rainfall in December
Copiague, NY
- Average rainfall in December: 3.27"
The wettest month (with the highest rainfall) is July (3.39").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in December
Copiague, NY
- Average rainfall days in December: 12.6 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in December
Copiague, NY
- Average snowfall in December: 0.59"
The month with the highest snowfall is March (1.34").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Copiague, NY
- Average snowfall days in December: 2.7 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Copiague, NY
- Average daylight in December: 9h and 18min
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 54min
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 48min).
Average sunshine days in December
Copiague, NY
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in December
Copiague, NY
- 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 and December (UV index 2).
Average cloud cover in December
Copiague, NY
- Average cloud cover in December: 48
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Copiague, NY
- 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).
