Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 24°F | 41°F | 32°F | 4.0" |
February | 24°F | 43°F | 33°F | 3.0" |
March | 31°F | 50°F | 40°F | 4.2" |
April | 41°F | 61°F | 50°F | 3.5" |
May | 51°F | 71°F | 60°F | 3.6" |
June | 60°F | 79°F | 69°F | 4.7" |
July | 68°F | 85°F | 76°F | 3.1" |
August | 65°F | 83°F | 74°F | 5.6" |
September | 60°F | 78°F | 68°F | 3.1" |
October | 49°F | 67°F | 58°F | 4.1" |
November | 37°F | 56°F | 46°F | 3.0" |
December | 31°F | 47°F | 39°F | 4.9" |
Index | Holtsville | New York | National |
Air quality index | 43 | 43 | 42 |
Pollution index | 39,208,800 | 6,179,275 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 262 |
Days with moderate air quality | 82 |
Days w/ poor A.Q. for sensitive groups | 18 |
Days with unhealthy air quality | 3 |
Pollutant | Total |
Arsenic | 0.060% |
Benzene | 0.320% |
Carbon Tetrachloride | 0.020% |
Lead | 0.320% |
Mercury | 0.130% |
City | Population | Air Quality Index | National Avg. |
Calverton, NY | 5,280 | 41 | 18.0% |
Bayport, NY | 8,584 | 43 | 14.0% |
Brentwood, NY | 62,743 | 43 | 14.0% |
North Bellport, NY | 10,468 | 43 | 14.0% |
Sayville, NY | 15,910 | 43 | 14.0% |
Holtsville, NY | 18,574 | 43 | 14.0% |
City | Population | Air Quality Index | National Avg. |
Central Saanich, BC | 18,572 | n/a | |
East Massapequa, NY | 18,564 | 51 | 2.0% |
Mayfield Heights, OH | 18,586 | 50 | = 100 |
Winthrop Town, MA | 18,558 | 43 | 14.0% |
Lake Ronkonkoma, NY | 18,555 | 43 | 14.0% |
Holtsville, NY | 18,574 | 43 | 14.0% |