TODAY NOV21
TEMPERATURE50
HUMIDITY86
PRESSURE99730
WIND COND.10 16.6
  • 4837Fri40%60%
  • 5139Sat40%30%
  • 5234Sun
  • 5441Mon
  • 5734Tue40%
daynightWeather update from New Haven, Tweed-New Haven Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Prospect Hill for July is 74.9 degrees
  • The lowest monthly average temperature in Prospect Hill for January is 31.5 degrees
  • The most monthly precipitation in Prospect Hill occurs in June with 4.7 inches
  • The air quality index in Prospect Hill is 3% better than the national average
  • The pollution index in Prospect Hill is 432% worse than the national average

Compare New Haven, CT Weather

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      Prospect Hill 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
      January23°F40°F32°F2.6"
      February23°F41°F32°F2.8"
      March30°F48°F39°F3.4"
      April40°F60°F50°F4.5"
      May50°F69°F59°F3.8"
      June60°F78°F68°F4.7"
      July66°F84°F75°F3.1"
      August64°F82°F74°F3.7"
      September58°F77°F67°F3.2"
      October47°F66°F57°F4.5"
      November37°F55°F46°F2.9"
      December30°F45°F37°F4.2"

      Prospect Hill 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.
      IndexProspect HillNew HavenConnecticut
      Air quality index414143
      Pollution index14,500,30014,500,3008,629,883

      Prospect Hill air quality

      MeasurementTotal
      Days measured365
      Days with good air quality280
      Days with moderate air quality71
      Days w/ poor A.Q. for sensitive groups12
      Days with unhealthy air quality2

      Air quality details

      PollutantTotal
      Arsenic0.030%
      Benzene0.140%
      Carbon Tetrachloride0.050%
      Lead0.080%
      Mercury0.060%

      Average monthly Prospect Hill temperature with heat index

      Prospect Hill monthly precipitation with daily maximum

      Prospect Hill monthly snow depth with daily maximum

      Prospect Hill monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Woodmont, CT1,6014118.0%
      Naugatuck, CT31,2014118.0%
      Shelton, CT41,1624118.0%
      Guilford Center, CT2,6534118.0%
      Meriden, CT59,5124118.0%
      New Haven, CT130,3814118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Stamford, CT130,0574314.0%
      Kent, WA130,0384510.0%
      Concord, CA129,2274020.0%
      Round Rock, TX128,8124412.0%
      Langley, BC132,088n/a 
      New Haven, CT130,3814118.0%
      Source: The Prospect Hill, New Haven, CT 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.