December weather forecast
Marcellus, NY

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Weather in December

December, the first month of the winter in Marcellus, is also an icy month, with an average temperature fluctuating between 34.5°F (1.4°C) and 25.5°F (-3.6°C).

Temperature

Setting in of December comes with a decrease in the average high-temperature, moving from a chilly 44.8°F (7.1°C) in November to a cold 34.5°F (1.4°C). A minimal decline in temperature from daytime highs is anticipated throughout the December nights, averaging a subzero cold 25.5°F (-3.6°C).

Humidity

In Marcellus, the average relative humidity in December is 85%.

Rainfall

In Marcellus, in December, during 9.2 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, there are 141.4 rainfall days, and 16.57" (421mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Marcellus. The months with the most snowfall are February and December, with an average 3.62" (92mm) of accumulated snow.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 7:17 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:40 pm EST.

Sunshine

In Marcellus, the average sunshine in December is 2.9h.

UV index

The months with the lowest UV index in Marcellus are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 1 during December translates into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

December temperatures vary between a high-temperature of 34.5°F (1.4°C) and a low-temperature of 25.5°F (-3.6°C).

What is the average humidity in December?

In Marcellus, the average relative humidity in December is 85%.

How many days does it rain in December?

In December, the rain falls for 9.2 days. Throughout December, 1.26" (32mm) of precipitation is accumulated.

When does it snow the most?

The months with the most snowfall are February and December, with an average 3.62" (92mm) of accumulated snow.

How much does it snow in December?

In Marcellus, in December, snow falls for 14.3 days, with typically accumulated 3.62" (92mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 6min of daylight.

How many hours of daylight does Marcellus have in December?

In December, the average day length is 9h and 4min.

When is the sunrise / sunset in December in Marcellus?

On the first day of December, sunrise is at 7:17 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:40 pm EST.

How many hours of sunshine does Marcellus have in December?

In Marcellus, the average sunshine duration in December is 2.9h.

When is the lowest UV index in Marcellus?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes 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
Marcellus, NY

Average temperature in December - Marcellus, NY
  • Average high temperature in December: 34.5°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in December: 25.5°F

The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

Average pressure in December
Marcellus, NY

Average pressure in December - Marcellus, 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 (29.92"Hg).

Average wind speed in December
Marcellus, NY

Average wind speed in December - Marcellus, NY
  • Average wind speed in December: 9.9mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

Average humidity in December
Marcellus, NY

Average humidity in December - Marcellus, NY
  • Average humidity in December: 85%

The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is April (78%).

Average rainfall in December
Marcellus, NY

Average rainfall in December - Marcellus, NY
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is May (1.77").
The driest month (with the least rainfall) is September (1.02").

Average rainfall days in December
Marcellus, NY

Average rainfall days in December - Marcellus, NY
  • Average rainfall days in December: 9.2 days

The months with the highest number of rainy days are May and July (15 days).
The month with the least rainy days is January (6.7 days).

Average snowfall in December
Marcellus, NY

Average snowfall in December - Marcellus, NY
  • Average snowfall in December: 3.62"

The months with the highest snowfall are February and December (3.62").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Marcellus, NY

Average snowfall days in December - Marcellus, NY
  • Average snowfall days in December: 14.3 days

The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 2h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 2h and 24min).

Average sunshine days in December
Marcellus, NY

Average sunshine days in December - Marcellus, NY
  • Average sunshine days in December: 10.3 days

The month with the most sunshine days is September (17.2 days).
The month with the least sunshine days is February (7.2 days).

Average UV index in December
Marcellus, NY

Average UV index in December - Marcellus, 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 January and December (UV index 1).

Average cloud cover in December
Marcellus, NY

Average cloud cover in December - Marcellus, NY
  • Average cloud cover in December: 71

The months with the most cloud cover are January and February (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 32).

Average visibility in December
Marcellus, NY

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

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

Marcellus, New York, USA

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