December weather forecastMount Sinai, NY
December
Weather in December
The first month of the winter, December, is also a frosty month in Mount Sinai, New York, with an average temperature ranging between max 43.7°F (6.5°C) and min 36.5°F (2.5°C).Temperature
In December, the meteorological conditions change slightly, with the average high-temperature moving from a cool 51.8°F (11°C) in November to a frosty 43.7°F (6.5°C). A modest dip in temperatures to an average of 36.5°F (2.5°C) is observed throughout Mount Sinai's December nights.Humidity
In Mount Sinai, the average relative humidity in December is 73%.Rainfall
The month with the most rainfall in Mount Sinai is December, when the rain falls for 11.4 days and typically aggregates up to 3.58" (91mm) of precipitation.Snowfall
Months with snowfall in Mount Sinai are January through March, October through December. In Mount Sinai, in December, snow falls for 1.5 days, with typically accumulated 1.06" (27mm) of snow. Throughout the year, there are 12.6 snowfall days, and 5.59" (142mm) of snow is accumulated.Ocean temperature
In Mount Sinai, the average seawater temperature in December is 48.9°F (9.4°C).Note: One needs to be cautious in 48.9°F (9.4°C) waters. 55.4°F (13°C) is already forbidding, but sub14°F (-10°C) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being.
Daylight
December has the shortest days of the year in Mount Sinai, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 6:58 am and sunset at 4:24 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:34 pm EST.
Sunshine
In December, the average sunshine 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 Mount Sinai. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mount Sinai, NY
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in December: 36.5°F
The months with the highest average low temperature are July and August (71.1°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).
Average pressure in December
Mount Sinai, 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
Mount Sinai, NY
- Average wind speed in December: 12.7mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in December
Mount Sinai, NY
- Average humidity in December: 73%
The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).
Average rainfall in December
Mount Sinai, NY
- Average rainfall in December: 3.58"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in December
Mount Sinai, NY
- Average rainfall days in December: 11.4 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in December
Mount Sinai, NY
- Average snowfall in December: 1.06"
The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in December
Mount Sinai, NY
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in December
Mount Sinai, NY
- Average sea temperature in December: 49°F
The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).
Average daylight in December /
Average sunshine in December
Mount Sinai, NY
- Average daylight in December: 9h and 18min
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 48min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Mount Sinai, NY
- Average sunshine days in December: 17.6 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (13 days).
Average UV index in December
Mount Sinai, 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, November and December (UV index 2).
Average cloud cover in December
Mount Sinai, NY
- Average cloud cover in December: 49
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Mount Sinai, 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).
