December weather forecast and climate
Rochester, NY

Amazing High Falls in Rochester, New York, USA
Amazing High Falls in Rochester, New York, USA

Weather in December

The first month of the winter, December, is still a cold month in Rochester, New York, with average temperature ranging between min 27.5°F (-2.5°C) and max 36°F (2.2°C).

Temperature

In December, the average high-temperature drops, from a frosty 45.9°F (7.7°C) in November, to a cold 36°F (2.2°C). In December, the average low-temperature is 27.5°F (-2.5°C).

Humidity

The average relative humidity is 83%.

Rainfall

In Rochester, during December, the rain falls for 11.5 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, there are 172.4 rainfall days, and 29.45" (748mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Rochester. In Rochester, during December, snow falls for 14.2 days and regularly aggregates up to 5.31" (135mm) of snow. In Rochester, during the entire year, snow falls for 70.9 days, and aggregates up to 27.44" (697mm) of snow.

Ocean temperature

In Rochester, the average seawater temperature is 41.7°F (5.4°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

With an average of 9h of daylight, December has the shortest days of the year.

Sunshine

The average sunshine in Rochester is 3.1h.

UV index

Months with the lowest UV index in Rochester are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Rochester?

In Rochester, New York, in December, the average high-temperature is 36°F (2.2°C), and the average low-temperature is 27.5°F (-2.5°C).

What is the average humidity in December in Rochester?

In Rochester, New York, the average relative humidity in December is 83%.

How much does it rain in Rochester in December?

In Rochester, in December, it is raining for 11.5 days, with typically 2.48" (63mm) of accumulated precipitation.

How much does it snow in Rochester in December?

In Rochester, during December, snow falls for 14.2 days and regularly aggregates up to 5.31" (135mm) of snow.

How cold is the water in December in Rochester?

In Rochester, the average seawater temperature in December is 41.7°F (5.4°C). Swimming in 41.7°F (5.4°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Rochester?

December has the shortest days of the year in Rochester, New York, with an average of 9h of daylight.

What is the average length of the day in December in Rochester?

In December, the average length of the day in Rochester is 9h.

How many hours of sunshine does Rochester have in December?

The average sunshine in December is 3.1h.

What are the months with the lowest UV index in Rochester?

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

How high is the UV index in December in Rochester?

In Rochester, New York, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Rochester, NY

Average temperature in December - Rochester, NY
  • Average high temperature in December: 36°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in December
Rochester, NY

Average pressure in December - Rochester, NY
  • Average pressure in December: 30.06"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in December
Rochester, NY

Average wind speed in December - Rochester, NY
  • Average wind speed in December: 10.7mph

The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).

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Average humidity in December
Rochester, NY

Average humidity in December - Rochester, NY
  • Average humidity in December: 83%

Months with the highest relative humidity are January and February (84%).
Months with the lowest relative humidity are August and September (76%).

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Average rainfall in December
Rochester, NY

Average rainfall in December - Rochester, NY
  • Average rainfall in December: 2.48"

The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is September (1.85").

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Average rainfall days in December
Rochester, NY

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

The month with the highest number of rainy days is August (18.7 days).
The month with the least rainy days is February (7.8 days).

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Average snowfall in December
Rochester, NY

Average snowfall in December - Rochester, NY
  • Average snowfall in December: 5.31"

The month with the highest snowfall is February (7.01").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Rochester, NY

Average snowfall days in December - Rochester, NY
  • Average snowfall days in December: 14.2 days

The month with the highest number of snowfall days is January (17.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Rochester, NY

Average sea temperature in December - Rochester, NY
  • Average sea temperature in December: 41.7°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is March (35.8°F).

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

Average daylight in December / Average sunshine in December - Rochester, NY
  • Average daylight in December: 9h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in December: 3.1h

The month with the most sunshine is July (Average sunshine: 10.6h).
Months with the least sunshine are January and February (Average sunshine: 2.7).

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Average sunshine days in December
Rochester, NY

Average sunshine days in December - Rochester, NY
  • Average sunshine days in December: 8.4 days

The month with the most sunshine days is September (13.9 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in December
Rochester, NY

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

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

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Average cloud cover in December
Rochester, NY

Average cloud cover in December - Rochester, 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 28).

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Average visibility in December
Rochester, NY

Average visibility in December - Rochester, NY
  • Average visibility in December: 6mi

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

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