December weather forecast
Ronkonkoma, NY

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Weather in December

December, the first month of the winter in Ronkonkoma, is also a frosty month, with temperature in the range of an average low of 37.2°F (2.9°C) and an average high of 44.1°F (6.7°C).

Temperature

Ronkonkoma's progression into December involves a gentle drop in the average high-temperature, from a fresh 52.3°F (11.3°C) in November to a chilly 44.1°F (6.7°C). In Ronkonkoma, December is characterized by an average low-temperature of 37.2°F (2.9°C), indicating a minor drop from daytime highs.

Humidity

The average relative humidity in December in Ronkonkoma is 74%.

Rainfall

The month with the most rainfall is December, when the rain falls for 12.3 days and typically aggregates up to 3.74" (95mm) of precipitation.

Snowfall

January through March, May, October and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 2.4 snowfall days, it receives 1.22" (31mm) of snow. Throughout the year, there are 14.7 snowfall days, and 6.14" (156mm) of snow is accumulated.

Daylight

The month with the shortest days in Ronkonkoma is December, with an average of 9h and 18min of daylight.
On the first day of December in Ronkonkoma, sunrise is at 6:58 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:34 pm EST.

Sunshine

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

UV index

The months with the lowest UV index in Ronkonkoma are January through March and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Ronkonkoma?

In Ronkonkoma, 44.1°F (6.7°C) is the average high-temperature and 37.2°F (2.9°C) is the average low-temperature during December.

What is the average humidity in December in Ronkonkoma?

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

What is the wettest month in Ronkonkoma?

The month with the most rainfall is December, when the rain falls for 12.3 days and typically aggregates up to 3.74" (95mm) of precipitation.

How many days does it rain in December in Ronkonkoma?

In Ronkonkoma, during December, the rain falls for 12.3 days and regularly aggregates up to 3.74" (95mm) of precipitation.

When does it start to snow in Ronkonkoma?

December is the first month it typically snows in Ronkonkoma, New York. Throughout December, in the average 2.4 snowfall days, it receives 1.22" (31mm) of snow.

What is the month with the shortest days in Ronkonkoma?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

How many hours of daylight does Ronkonkoma have in December?

In Ronkonkoma, New York, the average day length in December is 9h and 19min.

When is the sunrise / sunset in December in Ronkonkoma?

In December, on the first day of the month, sunrise is at 6:58 am and sunset at 4:25 pm. On the last day of the month, in Ronkonkoma, sunrise is at 7:16 am and sunset at 4:34 pm EST.

How long on average sun shines in December in Ronkonkoma?

The average sunshine duration in December in Ronkonkoma, New York, is 4.9h.

What is the month with the lowest UV index in Ronkonkoma?

January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Ronkonkoma.

How high is the UV index in December in Ronkonkoma?

In Ronkonkoma, New York, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
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
Ronkonkoma, NY

Average temperature in December - Ronkonkoma, NY
  • Average high temperature in December: 44.1°F

The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in December: 37.2°F

The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).

Average pressure in December
Ronkonkoma, NY

Average pressure in December - Ronkonkoma, 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
Ronkonkoma, NY

Average wind speed in December - Ronkonkoma, NY
  • Average wind speed in December: 13.4mph

The windiest month (with the highest average wind speed) is January (13.8mph).
The calmest months (with the lowest average wind speed) are July and August (9mph).

Average humidity in December
Ronkonkoma, NY

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

The months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (71%).

Average rainfall in December
Ronkonkoma, NY

Average rainfall in December - Ronkonkoma, NY
  • Average rainfall in December: 3.74"

The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in December
Ronkonkoma, NY

Average rainfall days in December - Ronkonkoma, NY
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in December
Ronkonkoma, NY

Average snowfall in December - Ronkonkoma, NY
  • Average snowfall in December: 1.22"

The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, June, July, August, September and November (0").

Average snowfall days in December
Ronkonkoma, NY

Average snowfall days in December - Ronkonkoma, NY
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is February (4.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

Average sunshine days in December
Ronkonkoma, NY

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

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in December
Ronkonkoma, NY

Average UV index in December - Ronkonkoma, 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
Ronkonkoma, NY

Average cloud cover in December - Ronkonkoma, 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
Ronkonkoma, NY

Average visibility in December - Ronkonkoma, 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).

Ronkonkoma, New York, USA

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