Islip
The tables below display average monthly climate and weather indicators in Islip New York.
Temperature by: Fahrenheit / Centigrade
| Islip Temperature |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Avg. Temperature | 28.6 | 29.8 | 38.4 | 48.3 | 58.3 | 67.1 | 73.2 | 73.0 | 66.5 | 54.6 | 44.0 | 34.3 | 51.3 |
| Avg. Max Temperature | 35.9 | 37.8 | 45.9 | 57.1 | 67.2 | 75.4 | 80.8 | 80.8 | 72.9 | 63.4 | 52.1 | 41.9 | 59.3 |
| Avg. Min Temperature | 21.3 | 21.7 | 30.8 | 39.5 | 49.4 | 58.7 | 65.7 | 65.1 | 60.0 | 45.7 | 35.8 | 26.5 | 43.4 |
| Days with Max Temp of 90 F or Higher | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 2.0 | 3.0 | 1.0 | < 0.5 | 0.0 | 0.0 | 0.0 | 7.0 |
| Days with Min Temp Below Freezing | 25.0 | 21.0 | 17.0 | 3.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 10.0 | 21.0 | 98.0 |
| |
|
| Islip Heating and Cooling |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Heating Degree Days | 1128 | 986 | 825 | 501 | 221 | 24.0 | 0.0 | 0.0 | 51.0 | 329 | 630 | 952 | 5647 |
| Cooling Degree Days | 0.0 | 0.0 | 0.0 | 0.0 | 14.0 | 87.0 | 254 | 248 | 96.0 | 7.0 | 0.0 | 0.0 | 706 |
| |
|
| Islip Precipitation |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Precipitation (inches) | 3.7 | 3.5 | 4.1 | 4.2 | 3.9 | 3.8 | 3.5 | 4.0 | 3.5 | 3.6 | 4.2 | 4.1 | 46.1 |
| Days with Precipitation 0.01 inch or More | 11.0 | 9.0 | 10.0 | 12.0 | 11.0 | 9.0 | 9.0 | 8.0 | 9.0 | 8.0 | 10.0 | 11.0 | 118 |
| Monthly Snowfall (inches) | 6.7 | 5.9 | 4.4 | 1.1 | < 0.05 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.9 | 3.7 | 22.7 |
| |
|
| Other Islip Weather Indicators |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Average Wind Speed | 9.6 | 10.1 | 10.3 | 9.8 | 8.8 | 8.3 | 7.5 | 7.3 | 7.7 | 8.2 | 9.3 | 9.2 | 8.8 |
| Clear Days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Partly Cloudy Days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Cloudy Days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Percent of Possible Sunshine | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Avg. Relative Humidity | 44.0 | 68.5 | 67.0 | 66.0 | 65.5 | 63.5 | 63.5 | 66.5 | 67.0 | 67.0 | 63.0 | 61.5 | 64.5 |
Weather information for other cities in New York