TODAY MAR19
TEMPERATURE33
HUMIDITY58
PRESSURE100780
WIND COND.270 13
  • 4635Tue
  • 5330Wed20%
  • 4425Thu
  • 4634Fri40%
  • 5330Sat70%40%
daynightWeather update from Trenton, Mercer County Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Princeton for July is 77 degrees
  • The lowest monthly average temperature in Princeton for January is 32.7 degrees
  • The most monthly precipitation in Princeton occurs in June with 5.3 inches
  • The air quality index in Princeton is 3% better than the national average
  • The pollution index in Princeton is 22% worse than the national average

Compare Princeton, NJ Weather

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      Princeton 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
      January25°F42°F33°F3.3"
      February25°F43°F34°F2.4"
      March33°F53°F42°F3.4"
      April43°F66°F54°F3.8"
      May52°F75°F63°F3.9"
      June62°F83°F72°F5.3"
      July67°F88°F77°F5.1"
      August65°F85°F75°F4.7"
      September59°F79°F68°F3.5"
      October48°F68°F57°F4.2"
      November37°F57°F46°F2.9"
      December31°F47°F38°F4.3"

      Princeton 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.
      IndexPrincetonNew JerseyNational
      Air quality index414542
      Pollution index3,313,9207,246,8912,726,193

      Princeton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality280
      Days with moderate air quality83
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Princeton air quality information

      PollutantTotal
      Arsenic0.350%
      Benzene0.020%
      Carbon Tetrachloride0.004%
      Lead0.350%
      Mercury0.340%

      Average monthly Princeton temperature with heat index

      Princeton monthly precipitation with daily maximum

      Princeton monthly snow depth with daily maximum

      Princeton monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Belle Mead, NJ5,4924118.0%
      Dayton, NJ8,1584118.0%
      Harlingen, NJ4814118.0%
      Kingston, NJ9634118.0%
      Rocky Hill, NJ6554118.0%
      Princeton, NJ31,1614118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Needham, MA31,1774314.0%
      Michigan City, IN31,1913726.0%
      Naugatuck, CT31,2014118.0%
      Centereach, NY31,1004314.0%
      Sherwood, AR31,2254510.0%
      Princeton, NJ31,1614118.0%
      Source: The Princeton, NJ 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.