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
As November transitions into December, Mastic Beach sees a gentle drop in the average high-temperature, transitioning from a cool 52.5°F (11.4°C) to a frosty 44.8°F (7.1°C). Mastic Beach documents a consistent average low-temperature of 37°F (2.8°C) at night during December.Humidity
The average relative humidity in December in Mastic Beach is 74%.Rainfall
December is the month with the most rainfall. Rain falls for 12.8 days and accumulates 3.31" (84mm) of precipitation.Snowfall
Months with snowfall in Mastic Beach are January through April, November and December. In Mastic Beach, in December, snow falls for 3.4 days, with typically accumulated 0.63" (16mm) of snow. In Mastic Beach, during the entire year, snow falls for 17.9 days and aggregates up to 4.57" (116mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December in Mastic Beach, sunrise is at 6:56 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:34 pm EST.
Sunshine
The average sunshine in December in Mastic Beach is 4.9h.UV index
The months with the lowest UV index in Mastic Beach are January through March and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average December temperature in Mastic Beach?
What is the average humidity in December in Mastic Beach?
What is the rainiest month in Mastic Beach?
How much does it rain in Mastic Beach in December?
How much does it snow in Mastic Beach in December?
What is the month with the shortest days in Mastic Beach?
What is the average length of the day in December in Mastic Beach?
What time are sunrise and sunset in December in Mastic Beach?
How long on average sun shines in December in Mastic Beach?
What are the months with the lowest UV index in Mastic Beach?
How high is the UV index in December in Mastic Beach?
Average temperature in December
Mastic Beach, NY
- Average high temperature in December: 44.8°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in December: 37°F
The months with the highest average low temperature are July and August (71.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in December
Mastic Beach, 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
Mastic Beach, NY
- Average wind speed in December: 14mph
The windiest month (with the highest average wind speed) is January (14.5mph).
The calmest months (with the lowest average wind speed) are July and August (9.6mph).
Average humidity in December
Mastic Beach, NY
- Average humidity in December: 74%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is November (71%).
Average rainfall in December
Mastic Beach, NY
- Average rainfall in December: 3.31"
The wettest month (with the highest rainfall) is December (3.31").
The driest months (with the least rainfall) are January, February and September (2.01").
Average rainfall days in December
Mastic Beach, NY
- Average rainfall days in December: 12.8 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (9 days).
Average snowfall in December
Mastic Beach, NY
- Average snowfall in December: 0.63"
The month with the highest snowfall is January (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mastic Beach, NY
- Average snowfall days in December: 3.4 days
The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Mastic Beach, NY
- 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 months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Mastic Beach, NY
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is February (12.8 days).
Average UV index in December
Mastic Beach, 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
Mastic Beach, 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 26).
Average visibility in December
Mastic Beach, 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).
Mastic Beach, New York, USA
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