December weather forecast
Greenlawn, NY

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Weather in December

The first month of the winter, December, is also a frosty month in Greenlawn, New York, with an average temperature varying between 35.4°F (1.9°C) and 43.3°F (6.3°C).

Temperature

In the transition to December, Greenlawn observes a minor drop in the average high-temperature, shifting from a cool 51.4°F (10.8°C) in November to a frosty 43.3°F (6.3°C). Greenlawn maintains an average of approximately an icy 35.4°F (1.9°C) during December nights, with only a minimal decrease from the daytime temperature.

Humidity

In Greenlawn, the average relative humidity in December is 74%.

Rainfall

In Greenlawn, in December, it is raining for 11.5 days, with typically 3.62" (92mm) of accumulated precipitation. Throughout the year, in Greenlawn, there are 152.5 rainfall days, and 35.04" (890mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Greenlawn, New York, in December, during 2.8 snowfall days, 1.46" (37mm) of snow is typically accumulated. In Greenlawn, during the entire year, snow falls for 15.5 days and aggregates up to 5.71" (145mm) of snow.

Daylight

December has the shortest days of the year in Greenlawn, with an average of 9h and 18min of daylight.
On the first day of December in Greenlawn, sunrise is at 6:59 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:35 pm EST.

Sunshine

In December, the average sunshine in Greenlawn is 4.9h.

UV index

The months with the lowest UV index in Greenlawn, New York, are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index of 2 during December leads to these instructions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
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Frequently asked questions

How cold is December in Greenlawn?

In December, in Greenlawn, the average high-temperature is 43.3°F (6.3°C), and the average low-temperature is 35.4°F (1.9°C).

What is the average humidity in December in Greenlawn?

In Greenlawn, the average relative humidity in December is 74%.

How much does it rain in Greenlawn in December?

In Greenlawn, in December, during 11.5 rainfall days, 3.62" (92mm) of precipitation is typically accumulated.

How much does it snow in Greenlawn in December?

In December, it is snowing for 2.8 days. Throughout December, 1.46" (37mm) of snow is accumulated.

What is the month with the shortest days in Greenlawn?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

How many hours of daylight does Greenlawn have in December?

The average day length in December is 9h and 18min.

When is the sunrise / sunset in December in Greenlawn?

On the first day of December, sunrise is at 6:59 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:35 pm EST.

How many hours of sunshine does Greenlawn have in December?

In Greenlawn, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Greenlawn?

The months with the lowest UV index in Greenlawn, New York, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Greenlawn?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Greenlawn, NY

Average temperature in December - Greenlawn, NY
  • Average high temperature in December: 43.3°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 35.4°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).

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Average pressure in December
Greenlawn, NY

Average pressure in December - Greenlawn, 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).

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Average wind speed in December
Greenlawn, NY

Average wind speed in December - Greenlawn, NY
  • Average wind speed in December: 11.7mph

The windiest month (with the highest average wind speed) is January (12.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).

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Average humidity in December
Greenlawn, NY

Average humidity in December - Greenlawn, NY
  • Average humidity in December: 74%

The months with the highest relative humidity are May and June (76%).
The month with the lowest relative humidity is November (71%).

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Average rainfall in December
Greenlawn, NY

Average rainfall in December - Greenlawn, NY
  • Average rainfall in December: 3.62"

The wettest month (with the highest rainfall) is July (4.09").
The driest month (with the least rainfall) is January (2.09").

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Average rainfall days in December
Greenlawn, NY

Average rainfall days in December - Greenlawn, NY
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.1 days).

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Average snowfall in December
Greenlawn, NY

Average snowfall in December - Greenlawn, NY
  • Average snowfall in December: 1.46"

The month with the highest snowfall is March (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Greenlawn, NY

Average snowfall days in December - Greenlawn, NY
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is February (4.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Greenlawn, NY

Average daylight in December / Average sunshine in December - Greenlawn, 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 month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in December
Greenlawn, NY

Average sunshine days in December - Greenlawn, NY
  • Average sunshine days in December: 16.9 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.4 days).

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Average UV index in December
Greenlawn, NY

Average UV index in December - Greenlawn, 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).

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Average cloud cover in December
Greenlawn, NY

Average cloud cover in December - Greenlawn, NY
  • Average cloud cover in December: 48

The month with the most cloud cover is December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 29).

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Average visibility in December
Greenlawn, NY

Average visibility in December - Greenlawn, 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).

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Greenlawn, New York, USA

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