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
With December's onset, the weather reveals a slight temperature decrease, transitioning from a cool 52.5°F (11.4°C) in November to a chilly 44.8°F (7.1°C). Mastic sustains a near constant temperature throughout December, with nighttime averages of 37°F (2.8°C).Humidity
In December, the average relative humidity is 74%.Rainfall
The month with the most rainfall is December, when the rain falls for 12.8 days and typically aggregates up to 3.31" (84mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Mastic, in December, snow falls for 3.4 days, with typically accumulated 0.63" (16mm) of snow. Throughout the year, there are 17.9 snowfall days, and 4.57" (116mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 6:56 am and sunset at 4:24 pm. On the last day of December, in Mastic, sunrise is at 7:15 am and sunset at 4:33 pm EST.
Sunshine
The average sunshine in December in Mastic is 4.9h.UV index
The months with the lowest UV index in Mastic are January through March and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: A daily high UV index of 2 in December leads to these guidelines:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
What are December temperatures in Mastic?
What is the average humidity in December in Mastic?
What is the wettest month in Mastic?
How many days does it rain in December in Mastic?
How much does it snow in Mastic in December?
What is the month with the shortest days in Mastic?
What is the average length of the day in December in Mastic?
When is the sunrise / sunset in December in Mastic?
How many hours of sunshine does Mastic have in December?
When is the lowest UV index in Mastic?
How high is the UV index in December in Mastic?
Average temperature in December
Mastic, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, New York, USA
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