Islip Li Macarthur Ap, New York
  ID: USW00004781  Latitude:  40.7939  Longitude:  -73.1017
  Elevation: 84 feet (  25.6 meters)
  Source: NOAA Climate Normals 1991-2020
  
  
      
  
  
   
  
      
  
  
    Precipitation Total: 45.99 in., 18.11 cm.
   
  
      
  
  
   
  
      
  Monthly Data Table for Islip Li Macarthur Ap, New York
  Monthly Data from NOAA Monthly Normals 2006-2020
  
  
    Imperial Units
    
      | Statistic | Units | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 
          
      | Maximum Temperature | °F | 39.8 | 41.2 | 48.4 | 59.1 | 69.1 | 77.7 | 83.9 | 82.1 | 75.6 | 65.2 | 54.2 | 45.2 | 
          
      | Minimum Temperature | °F | 25.2 | 25.7 | 32.4 | 41.5 | 51.8 | 61.3 | 68.4 | 66.3 | 59.6 | 48.8 | 37.8 | 30.8 | 
      
      
          
      | Heating Degree Days | °F | 1007.4 | 883.4 | 762.6 | 443.6 | 167.3 | 22.6 | 0.4 | 1.8 | 39.0 | 265.3 | 570.1 | 837.0 | 
          
      | Cooling Degree Days | °F | 0.0 | 0.0 | 0.0 | 2.6 | 26.2 | 157.6 | 346.0 | 287.0 | 116.9 | 17.3 | 0.2 | 0.0 | 
          
      | Precipitation | I | 3.5 | 3.7 | 4.3 | 4.1 | 3.4 | 4.0 | 3.8 | 4.5 | 3.3 | 4.3 | 3.4 | 5.2 | 
  
   
  
  
  
  
    Metric Units
    
      | Statistic | Units | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 
          
      | Maximum Temperature | °C | 4.3 | 5.1 | 9.1 | 15.1 | 20.6 | 25.4 | 28.8 | 27.8 | 24.2 | 18.4 | 12.3 | 7.3 | 
          
      | Minimum Temperature | °C | -3.8 | -3.5 | 0.2 | 5.3 | 11.0 | 16.3 | 20.2 | 19.1 | 15.3 | 9.3 | 3.2 | -0.7 | 
      
      
          
      | Heating Degree Days | °C | 541.9 | 473.0 | 405.9 | 228.7 | 75.2 | -5.2 | -17.6 | -16.8 | 3.9 | 129.6 | 298.9 | 447.2 | 
          
      | Cooling Degree Days | °C | -17.8 | -17.8 | -17.8 | -16.3 | -3.2 | 69.8 | 174.4 | 141.7 | 47.2 | -8.2 | -17.7 | -17.8 | 
          
      | Precipitation | M | 8.8 | 9.3 | 10.9 | 10.5 | 8.5 | 10.3 | 9.6 | 11.4 | 8.4 | 10.9 | 8.7 | 13.2 |