TODAY DEC22
TEMPERATURE36
HUMIDITY75
PRESSURE102780
WIND COND.30 5.4
  • 5738Sun
  • 6648Mon
  • 7057Tue20%
  • 725950%
  • 7362Thu
daynightWeather update from Baton Rouge, Baton Rouge Metropolitan, Ryan Field at
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Weather Quick Facts

  • The highest monthly average temperature in Old Jefferson for August is 82.2 degrees
  • The lowest monthly average temperature in Old Jefferson for January is 52.8 degrees
  • The most monthly precipitation in Old Jefferson occurs in December with 9.3 inches
  • The air quality index in Old Jefferson is 7% worse than the national average
  • The pollution index in Old Jefferson is 29% better than the national average

Compare Old Jefferson, LA Weather

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      Old 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
      January44°F65°F53°F5.2"
      February45°F66°F54°F5.0"
      March51°F74°F62°F3.1"
      April58°F80°F68°F3.2"
      May66°F86°F75°F5.7"
      June72°F92°F81°F3.0"
      July74°F92°F82°F5.2"
      August74°F93°F82°F7.9"
      September70°F89°F78°F6.9"
      October58°F81°F69°F5.6"
      November49°F73°F59°F2.7"
      December45°F66°F54°F9.3"

      Old 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.
      IndexOld JeffersonLouisianaNational
      Air quality index4510642
      Pollution index1,932,4202,526,4752,726,193

      Old Jefferson air quality

      MeasurementTotal
      Days measured365
      Days with good air quality224
      Days with moderate air quality132
      Days w/ poor A.Q. for sensitive groups9
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.030%
      Carbon Tetrachloride0.060%
      Lead0.000%
      Mercury0.000%

      Average monthly Old Jefferson temperature with heat index

      Old Jefferson monthly precipitation with daily maximum

      Old Jefferson monthly snow depth with daily maximum

      Old Jefferson monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Port Vincent, LA3954510.0%
      Gonzales, LA10,9324510.0%
      Shenandoah, LA21,0454510.0%
      Baker, LA13,2334510.0%
      Gardere, LA10,6294510.0%
      Old Jefferson, LA7,3214510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Winooski, VT7,3203726.0%
      Whitewater Region, ON7,320n/a 
      Gorham, ME7,3224020.0%
      Mills River, NC7,3194412.0%
      Mexia, TX7,3194118.0%
      Old Jefferson, LA7,3214510.0%
      Source: The Old 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.