December weather forecast and climate
Islip, NY

What is the temperature in December in Islip?

In December, in Islip, New York, the average high-temperature is 43°F (6.1°C), and the average low-temperature is 28.2°F (-2.1°C).

How much does it rain in Islip in December?

In Islip, New York, during December, the rain falls for 10.8 days and regularly aggregates up to 4.1" (103.1mm) of precipitation.

How many days does it snow in December in Islip?

In Islip, in December, during 2.4 snowfall days, typically, 5.4" (137.2mm) of snow is accumulated.

What is the water temperature in December in Islip?

The average seawater temperature, in December, in Islip, New York, is 48.9°F (9.4°C). Swimming in 48.9°F (9.4°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.
Average temperature in December - Islip, NY
  • Average high temperature in December: 43°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (38°F).

  • Average low temperature in December: 28.2°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (23.3°F).

Average rainfall in December - Islip, NY
  • Average rainfall in December: 4.1"

The wettest month (with the highest rainfall) is March (4.4").
The driest month (with the lowest rainfall) is February (3.3").

Average rainfall days in December - Islip, NY
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is April (11.3 days).
Months with the lowest number of rainy days are August and October (8.5 days).

Average snowfall in December - Islip, NY
  • Average snowfall in December: 5.4"

The month with the highest snowfall is February (7.1").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in December - Islip, NY
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is January (3.7 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in December - Islip, NY
  • Average sea temperature in December: 49°F

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

Average daylight in December - Islip, NY
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

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