TODAY MAR19
TEMPERATURE35
HUMIDITY61
PRESSURE100510
WIND COND.280 18.4
  • 4737Tue
  • 5230Wed20%
  • 4326Thu
  • 4336Fri
  • 5230Sat60%50%
daynightWeather update from Islip, Long Island Mac Arthur Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Holtsville for July is 75.9 degrees
  • The lowest monthly average temperature in Holtsville for January is 32.3 degrees
  • The most monthly precipitation in Holtsville occurs in August with 5.6 inches
  • The air quality index in Holtsville is 2% worse than the national average
  • The pollution index in Holtsville is 1338% worse than the national average

Compare Holtsville, NY Weather

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      Holtsville Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January24°F41°F32°F4.0"
      February24°F43°F33°F3.0"
      March31°F50°F40°F4.2"
      April41°F61°F50°F3.5"
      May51°F71°F60°F3.6"
      June60°F79°F69°F4.7"
      July68°F85°F76°F3.1"
      August65°F83°F74°F5.6"
      September60°F78°F68°F3.1"
      October49°F67°F58°F4.1"
      November37°F56°F46°F3.0"
      December31°F47°F39°F4.9"

      Holtsville air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexHoltsvilleNew YorkNational
      Air quality index434342
      Pollution index39,208,8006,179,2752,726,193

      Holtsville air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality262
      Days with moderate air quality82
      Days w/ poor A.Q. for sensitive groups18
      Days with unhealthy air quality3

      Holtsville air quality information

      PollutantTotal
      Arsenic0.060%
      Benzene0.320%
      Carbon Tetrachloride0.020%
      Lead0.320%
      Mercury0.130%

      Average monthly Holtsville temperature with heat index

      Holtsville monthly precipitation with daily maximum

      Holtsville monthly snow depth with daily maximum

      Holtsville monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Calverton, NY5,2804118.0%
      Bellport, NY1,8994314.0%
      Central Islip, NY33,5914314.0%
      North Patchogue, NY8,2024314.0%
      Brookhaven, NY3,2034314.0%
      Holtsville, NY18,5744314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Central Saanich, BC18,572n/a 
      East Massapequa, NY18,564512.0%
      Mayfield Heights, OH18,58650= 100
      Winthrop Town, MA18,5584314.0%
      Lake Ronkonkoma, NY18,5554314.0%
      Holtsville, NY18,5744314.0%
      Source: The Holtsville, NY weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.