Greater Rochester International Airport
New York, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Greater Rochester International Airport, NY

The first month of the winter, December, is also a wintry month in Greater Rochester International Airport, New York, with average temperature fluctuating between 35.6°F (2°C) and 21.2°F (-6°C).

Temperature

In December, the average high-temperature drops, from a frosty 48.2°F (9°C) in November, to a cold 35.6°F (2°C). In Greater Rochester International Airport, in December, the average low-temperature is 21.2°F (-6°C).

Rainfall

In Greater Rochester International Airport, during December, the rain falls for 17 days and regularly aggregates up to 2.5" (64mm) of precipitation. In Greater Rochester International Airport, during the entire year, the rain falls for 152 days and collects up to 31.9" (810mm) of precipitation.

Ocean temperature

In Greater Rochester International Airport, the average seawater temperature is 41°F (5°C). 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 9.1h of daylight, December has the shortest days of the year.

Sunshine

Months with the least sunshine are January, November and December, with an average of 3h of sunshine.

UV index

Months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to the UV radiation for average individuals.
The daily maximum UV index of 1 interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in December in Greater Rochester International Airport?

In Greater Rochester International Airport, in December, the average high-temperature is 35.6°F (2°C), and the average low-temperature is 21.2°F (-6°C).

How many days does it rain in December in Greater Rochester International Airport?

In Greater Rochester International Airport, during December, the rain falls for 17 days and regularly aggregates up to 2.5" (64mm) of precipitation.

How cold is the water in December in Greater Rochester International Airport?

In Greater Rochester International Airport, the average seawater temperature in December is 41°F (5°C). Swimming in 41°F (5°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 Greater Rochester International Airport?

December has the shortest days of the year in Greater Rochester International Airport, with an average of 9.1h of daylight.

What is the average length of the day in December in Greater Rochester International Airport?

In Greater Rochester International Airport, the average length of the day in December is 9.1h.

What is the month with the least sunshine in Greater Rochester International Airport?

January, November and December, with an average of 3h of sunshine, are months with the least sunshine in Greater Rochester International Airport, New York.

How many hours of sunshine does Greater Rochester International Airport have in December?

In Greater Rochester International Airport, the average sunshine in December is 3h.

When is the lowest UV index in Greater Rochester International Airport?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Greater Rochester International Airport, New York.

What is the UV index reading in December in Greater Rochester International Airport?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - Greater Rochester International Airport, NY
  • Average high temperature in December: 36°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in December: 21°F

Months with the highest average low temperature are July and August (59°F).
Coldest months (with the lowest average low temperature) are January and February (16°F).

Average rainfall in December - Greater Rochester International Airport, NY
  • Average rainfall in December: 2.5"

The wettest month (with the highest rainfall) is August (3.3").
Driest months (with the lowest rainfall) are January and February (2").

Average rainfall days in December - Greater Rochester International Airport, NY
  • Average rainfall days in December: 17 days

The month with the highest number of rainy days is December (17 days).
The month with the lowest number of rainy days is July (9 days).

Average sea temperature in December - Greater Rochester International Airport, NY
  • Average sea temperature in December: 41°F

The best month for swimming (with the highest average sea temperature) is August (70°F).
Coldest months (with the lowest average sea temperature) are February and March (36°F).

Average daylight in December / Average sunshine in December - Greater Rochester International Airport, NY
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 3h

Months with most sunshine are June and July (Average sunshine: 10h).
Months with least sunshine are January, November and December (Average sunshine: 3).

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

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).