Rochester
New York, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Rochester, NY

The High Falls in Rochester, New York, and the distant view of the city
The High Falls in Rochester, New York, and the distant view of the city
December, the first month of the winter, in Rochester, is still a cold month, with average temperature ranging between min 23.5°F (-4.7°C) and max 36.5°F (2.5°C).

Temperature

In December, the average high-temperature decreases, from a chilly 48°F (8.9°C) in November, to a cold 36.5°F (2.5°C). In December, in Rochester, the average low-temperature is 23.5°F (-4.7°C).

Humidity

With an average relative humidity of 77.5%, December is the most humid month.

Rainfall

In Rochester, New York, it is raining for 17.6 days, with typically 2.6" (66.8mm) of accumulated precipitation. In Rochester, New York, during the entire year, the rain falls for 166.8 days and collects up to 34.3" (870.4mm) of precipitation.

Snowfall

Months with snowfall in Rochester, New York, are January through May, October through December.

Ocean temperature

In Rochester, the average seawater temperature is 41.7°F (5.4°C). Swimming in 41.7°F (5.4°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

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

Sunshine

With an average of 2.5h of sunshine, December has the least sunshine of the year in Rochester.

What is the temperature in December in Rochester?

The average high-temperature, in December, is 36.5°F (2.5°C), while the average low-temperature is 23.5°F (-4.7°C).

What is the most humid month in Rochester?

With an average relative humidity of 77.5%, December is the most humid month.

What is the average humidity in December in Rochester?

The average relative humidity in December is 77.5%.

How many days does it rain in December in Rochester?

In December, in Rochester, New York, the rain falls for 17.6 days. Throughout December, 2.6" (66.8mm) of precipitation is accumulated.

How many days does it snow in December in Rochester?

In Rochester, New York, during December, snow falls for 14.5 days and regularly aggregates up to 21.8" (553.7mm) of snow.

What is the water temperature in December in Rochester?

In Rochester, in December, the average water temperature 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?

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

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

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

What is the month with the least sunshine in Rochester?

December has the least sunshine of the year, with an average of 2.5h of sunshine.

How long on average sun shines in December in Rochester?

In December, the average sunshine in Rochester, New York, is 2.5h.
Average temperature in December - Rochester, NY
  • Average high temperature in December: 36.5°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.7°F).

  • Average low temperature in December: 23.5°F

The month with the highest average low temperature is July (60.7°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).

Average humidity in December - Rochester, NY
  • Average humidity in December: 77.5%

The month with the highest relative humidity is December (77.5%).
The month with the lowest relative humidity is April (67%).

Average rainfall in December - Rochester, NY
  • Average rainfall in December: 2.6"

The wettest month (with the highest rainfall) is August (3.5").
The driest month (with the lowest rainfall) is February (2").

Average rainfall days in December - Rochester, NY
  • Average rainfall days in December: 17.6 days

The month with the highest number of rainy days is January (19.4 days).
Months with the lowest number of rainy days are July and August (10.8 days).

Average snowfall in December - Rochester, NY
  • Average snowfall in December: 21.8"

The month with the highest snowfall is January (28.2").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in December - Rochester, NY
  • Average snowfall days in December: 14.5 days

The month with the highest number of snowfall days is January (18 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 9h).

  • Average sunshine in December: 2.5h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 2.5h).