December weather forecast
Black River, NY

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Weather in December

December, the first month of the winter in Black River, is also a wintry month, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 32.2°F (0.1°C).

Temperature

Black River's progression into December involves a drop in the average high-temperature, receding from a frosty 42.8°F (6°C) in November to an icy 32.2°F (0.1°C). December nights in Black River cool to an average low-temperature of 23.2°F (-4.9°C), a marginal decrease from its daytime equivalent.

Humidity

The average relative humidity in December in Black River, New York, is 85%.

Rainfall

In December, in Black River, New York, the rain falls for 10.7 days. Throughout December, 3.27" (83mm) of precipitation is accumulated. In Black River, New York, during the entire year, the rain falls for 163.9 days and collects up to 33.19" (843mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Black River, New York, during December, snow falls for 15.9 days and regularly aggregates up to 9.96" (253mm) of snow. In Black River, New York, during the entire year, snow falls for 84.4 days and aggregates up to 43.58" (1107mm) of snow.

Daylight

With an average of 9h and 0min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:37 am and sunset at 4:35 pm EST.

Sunshine

In Black River, the average sunshine in December is 3h.

UV index

The months with the lowest UV index in Black River are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 1 during December translates into the following guidance:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Enhance your sun protection with tightly woven, yet airy clothing. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
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Frequently asked questions

How cold is it in Black River in December?

December temperatures in Black River, New York, vary between a high-temperature of 32.2°F (0.1°C) and a low-temperature of 23.2°F (-4.9°C).

What is the average humidity in December in Black River?

In December, the average relative humidity in Black River, New York, is 85%.

How much does it rain in Black River in December?

In Black River, New York, during December, the rain falls for 10.7 days and regularly aggregates up to 3.27" (83mm) of precipitation.

How many days does it snow in December in Black River?

In Black River, New York, in December, snow falls for 15.9 days, with typically accumulated 9.96" (253mm) of snow.

What is the month with the shortest days in Black River?

December has the shortest days of the year, with an average of 9h and 0min of daylight.

How many hours of daylight does Black River have in December?

In Black River, New York, the average day length in December is 8h and 58min.

What time are sunrise and sunset in December in Black River?

On the first day of December in Black River, sunrise is at 7:18 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:35 pm EST.

How many hours of sunshine does Black River have in December?

The average sunshine duration in December in Black River, New York, is 3h.

When is the lowest UV index in Black River?

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

What is the UV index intensity in December in Black River?

In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a low health risk 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
Black River, NY

Average temperature in December - Black River, NY
  • Average high temperature in December: 32.2°F

The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (26.1°F).

  • Average low temperature in December: 23.2°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).

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Average pressure in December
Black River, NY

Average pressure in December - Black River, NY
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Black River, NY

Average wind speed in December - Black River, NY
  • Average wind speed in December: 10mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

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Average humidity in December
Black River, NY

Average humidity in December - Black River, NY
  • Average humidity in December: 85%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and September (77%).

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Average rainfall in December
Black River, NY

Average rainfall in December - Black River, NY
  • Average rainfall in December: 3.27"

The wettest month (with the highest rainfall) is October (3.54").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in December
Black River, NY

Average rainfall days in December - Black River, NY
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is October (17.7 days).
The month with the least rainy days is February (7 days).

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Average snowfall in December
Black River, NY

Average snowfall in December - Black River, NY
  • Average snowfall in December: 9.96"

The month with the highest snowfall is January (10.47").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Black River, NY

Average snowfall days in December - Black River, NY
  • Average snowfall days in December: 15.9 days

The month with the highest number of snowfall days is January (19.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Black River, NY

Average daylight in December / Average sunshine in December - Black River, NY
  • Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 3h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).

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Average sunshine days in December
Black River, NY

Average sunshine days in December - Black River, NY
  • Average sunshine days in December: 7.9 days

The month with the most sunshine days is September (15.1 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in December
Black River, NY

Average UV index in December - Black River, NY
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in December
Black River, NY

Average cloud cover in December - Black River, NY
  • Average cloud cover in December: 69

The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in December
Black River, NY

Average visibility in December - Black River, NY
  • Average visibility in December: 5mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).

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Black River, New York, USA

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