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Weather History
Islip Weather History

Summary
  Temp.
(ºF)		 Relative Humidity
(Percentage)		 Extreme Temp.
(Days Per Month)		 Rain
(Inches) 		Cloudiness
(Days Per Month)
  Average A.M. P.M. Below
32º		 Above
90º 		Average Clear Partly
Cloudy		 Cloudy
January 28.6 76% 62% 25 0 3.7
February 29.8 76% 58% 21 0 3.5
March 38.4 77% 56% 17 0 4.1
April 48.3 76% 55% 3 0 4.2
May 58.3 76% 56% 0 1 3.9
June 67.1 71% 53% 0 2 3.8
July 73.2 74% 56% 0 3 3.5
August 73.0 77% 56% 0 1 4.0
September 66.5 78% 56% 0 N/A 3.5
October 54.6 78% 53% 1 0 3.6
November 44.0 73% 55% 10 0 4.2
December 34.3 70% 54% 21 0 4.1
Annual 51.3 75% 56% 98 7 46.1

Average Temperature (ºF)
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
28.6 29.8 38.4 48.3 58.3 67.1 73.2 73.0 66.5 54.6 44.0 34.3

Relative Humidity (Percentage)
Morning
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
76% 76% 77% 76% 76% 71% 74% 77% 78% 78% 73% 70%
Afternoon
62% 58% 56% 55% 56% 53% 56% 56% 56% 53% 55% 54%

Rain (Inches)
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
3.7 3.5 4.1 4.2 3.9 3.8 3.5 4.0 3.5 3.6 4.2 4.1

Cloudiness (Days Per Month)
  January February March
Clear Days Days Days
Partly Cloudy Days Days Days
Cloudy Days Days Days
  April May June
Clear Days Days Days
Partly Cloudy Days Days Days
Cloudy Days Days Days
  July August September
Clear Days Days Days
Partly Cloudy Days Days Days
Cloudy Days Days Days
  October November December
Clear Days Days Days
Partly Cloudy Days Days Days
Cloudy Days Days Days
  Clear Partly Cloudy Cloudy
 
Days Per Year


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