December weather forecast
Rockdale, NY

Share

Weather in December

The first month of the winter, December, is also a wintry month in Rockdale, New York, with an average temperature ranging between max 32.9°F (0.5°C) and min 23.2°F (-4.9°C).

Temperature

The onset of December entails a temperature shift, as the average high-temperature decreases from a frosty 43.2°F (6.2°C) in November to a wintry 32.9°F (0.5°C). In the month of December, an average of 23.2°F (-4.9°C) marks the low-temperature in Rockdale.

Humidity

The average relative humidity in December is 87%.

Rainfall

In Rockdale, in December, during 9.9 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Rockdale, during the entire year, the rain falls for 142.2 days and collects up to 18.58" (472mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Rockdale, during December, snow falls for 15.5 days and regularly aggregates up to 4.25" (108mm) of snow. Throughout the year, there are 82.5 snowfall days, and 23.31" (592mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:11 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:39 pm EST.

Sunshine

In December, the average sunshine is 2.7h.

UV index

February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 1 during December translates into the following guidance:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Updated: Jul 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In Rockdale, in December, the average high-temperature is 32.9°F (0.5°C), and the average low-temperature is 23.2°F (-4.9°C).

What is the average humidity in December?

In Rockdale, the average relative humidity in December is 87%.

How much does it rain in December?

In December, the rain falls for 9.9 days. Throughout December, 1.38" (35mm) of precipitation is accumulated.

How many days does it snow in December?

In Rockdale, in December, snow falls for 15.5 days, with typically accumulated 4.25" (108mm) of snow.

What is the month with the shortest days?

The month with the shortest days in Rockdale is December, with an average of 9h and 6min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 8min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:11 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:39 pm EST.

How long on average sun shines in December in Rockdale?

The average sunshine duration in December is 2.7h.

What is the month with the lowest UV index?

February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in December in Rockdale?

In Rockdale, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Rockdale, NY

Average temperature in December - Rockdale, NY
  • Average high temperature in December: 32.9°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (26.8°F).

  • Average low temperature in December: 23.2°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).

Average pressure in December
Rockdale, NY

Average pressure in December - Rockdale, NY
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Rockdale, NY

Average wind speed in December - Rockdale, NY
  • Average wind speed in December: 9.1mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Rockdale, NY

Average humidity in December - Rockdale, NY
  • Average humidity in December: 87%

The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is July (79%).

Average rainfall in December
Rockdale, NY

Average rainfall in December - Rockdale, NY
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is August (2.05").
The driest month (with the least rainfall) is September (1.1").

Average rainfall days in December
Rockdale, NY

Average rainfall days in December - Rockdale, NY
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in December
Rockdale, NY

Average snowfall in December - Rockdale, NY
  • Average snowfall in December: 4.25"

The month with the highest snowfall is January (4.65").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Rockdale, NY

Average snowfall days in December - Rockdale, NY
  • Average snowfall days in December: 15.5 days

The month with the highest number of snowfall days is January (18.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Rockdale, NY
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 2h and 4min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 2h and 30min).

Average sunshine days in December
Rockdale, NY

Average sunshine days in December - Rockdale, NY
  • Average sunshine days in December: 8.7 days

The month with the most sunshine days is September (16.3 days).
The month with the least sunshine days is February (7.1 days).

Average UV index in December
Rockdale, NY

Average UV index in December - Rockdale, NY
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are February, November and December (UV index 1).

Average cloud cover in December
Rockdale, NY

Average cloud cover in December - Rockdale, NY
  • Average cloud cover in December: 73

The month with the most cloud cover is February (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 40).

Average visibility in December
Rockdale, NY

Average visibility in December - Rockdale, NY
  • Average visibility in December: 5mi

The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).

Rockdale, New York, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location