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Key findings

  • The highest monthly average temperature in Jefferson for August is 83 degrees
  • The lowest monthly average temperature in Jefferson for January is 54 degrees
  • The most monthly precipitation in Jefferson occurs in August with 8.5 inches
  • The air quality index in Jefferson is 10% better than the national average
  • The pollution index in Jefferson is 23% better than the national average

Compare Jefferson, LA Weather

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      Jefferson 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
      January45°F66°F54°F5.0"
      February47°F69°F57°F5.2"
      March53°F75°F64°F5.4"
      April60°F81°F71°F5.1"
      May67°F86°F76°F5.7"
      June74°F91°F82°F6.3"
      July75°F92°F83°F6.7"
      August76°F93°F83°F8.5"
      September73°F90°F81°F5.5"
      October62°F83°F72°F3.3"
      November52°F74°F62°F2.3"
      December48°F68°F57°F6.8"

      Jefferson 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.
      IndexJeffersonLouisianaNational
      Air quality index4510650
      Pollution index3,881,7302,540,2835,066,862

      Jefferson air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality229
      Days with moderate air quality134
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Jefferson air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.040%
      Carbon Tetrachloride0.002%
      Lead0.010%
      Mercury0.000%

      Average monthly Jefferson temperature with heat index

      Jefferson monthly precipitation with daily maximum

      Jefferson monthly snow depth with daily maximum

      Jefferson monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Boutte, LA2,5974118%
      Belle Chasse, LA13,7094510%
      Destrehan, LA11,2114510%
      Harahan, LA9,3214510%
      Lafourche Crossing, LA2,1254510%
      Jefferson, LA10,5324510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Royse City, TX10,532512%
      Milford, DE10,5324216%
      Forest, VA10,5372648%
      Maynard, MA10,5264020%
      Farmington, MI10,5265612%
      Jefferson, LA10,5324510%
      Source: The Jefferson, LA 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.