Islip Weather In December

In the last 22 years the highest measured December temperature in Islip was 77°F, while the regular high temperature is 43.9°F. The lowest documented temperature for Islip for the past 22 years in December was 5°F, and the typical low is 27.5°F.

Islip usually receives an average of 4.13 inches of precipitation during December and averages 4.1 inches of snow.