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Weather & Climate in Jefferson, LA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Jefferson has a warm climate with an average annual temperature of 72°F (22°C). Winters average 55°F in January while summers reach 85°F in July. The area gets 317 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 64.6 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 46. 61% of days have good air quality. The city sits at an elevation of 9 feet.
Temperature
55°F Jan (13°C)
85°F Jul (30°C)
| Annual Average | 71.8°F |
| 33% above US avg | |
| January Average | 55°F (13°C) |
| July Average | 85°F (30°C) |
| Sunny Days | 317 days/yr |
Geography
| Elevation | 9 ft (3 m) |
| Area | 3.3 sq mi (8.5 km²) |
| Population Density | 3,684/sq mi |
| Coordinates | 29.9604°N, 90.1559°W |
| Timezone | America/Chicago |
| County | St. Charles Parish County |
| Nearest Airport | Louis Armstrong New Orleans International (MSY) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 46.0 |
| Rating | Good |
| Good Days % | 61.2% |
| Unhealthy Days | 1 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 85.1 / 100 |
| Social Vulnerability | 41.7 / 100 |
| Community Resilience | 100.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.0.
| Aug 2, 2010 | 16 km ESE of Clinton, Louisiana | M3.0 | 116 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
25 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Francine | Category 2 | 104 mph | 82 km |
| 2021 | Ida | Category 4 | 150 mph | 43 km |
| 2020 | Zeta | Category 3 | 115 mph | 36 km |
| 2020 | Delta | Category 2 | 98 mph | 265 km |
| 2020 | Sally | Category 2 | 109 mph | 205 km |
| 2019 | Barry | Category 1 | 75 mph | 184 km |
| 2017 | Nate | Category 1 | 92 mph | 92 km |
| 2012 | Isaac | Category 1 | 81 mph | 71 km |
| 2009 | Ida | Category 1 | 86 mph | 215 km |
| 2008 | Gustav | Category 2 | 109 mph | 100 km |
| 2005 | Katrina | Category 4 | 144 mph | 60 km |
| 2005 | Dennis | Category 3 | 121 mph | 289 km |
| 2005 | Cindy | Category 1 | 75 mph | 85 km |
| 2004 | Ivan | Category 4 | 132 mph | 217 km |
| 2002 | Lili | Category 4 | 121 mph | 204 km |
| 1998 | Georges | Category 2 | 109 mph | 130 km |
| 1998 | Earl | Category 2 | 98 mph | 226 km |
| 1997 | Danny | Category 1 | 81 mph | 86 km |
| 1995 | Opal | Category 4 | 150 mph | 261 km |
| 1995 | Erin | Category 1 | 86 mph | 265 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
538 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 39 fatalities, 745 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Dec 6, 1983 | EF4 | 37 km | 7.0 mi | 0 |
| Oct 3, 1964 | EF4 | 45 km | 1.5 mi | 22 |
| Mar 22, 2022 | EF3 | 13 km | 11.5 mi | 1 |
| Feb 7, 2017 | EF3 | 16 km | 10.1 mi | 0 |
| Feb 23, 2016 | EF3 | 89 km | 7.8 mi | 0 |
| Dec 25, 2012 | EF3 | 89 km | 60.3 mi | 0 |
| May 26, 2011 | EF3 | 74 km | 6.1 mi | 0 |
| Aug 25, 1992 | EF3 | 31 km | 9.0 mi | 2 |
| May 19, 1980 | EF3 | 74 km | 13.1 mi | 0 |
| Apr 12, 1969 | EF3 | 76 km | 10.7 mi | 0 |
| Jan 28, 1966 | EF3 | 16 km | 0.1 mi | 0 |
| Mar 21, 1957 | EF3 | 67 km | 2.0 mi | 0 |
| Feb 6, 1953 | EF3 | 78 km | 15.6 mi | 2 |
| Apr 10, 2024 | EF2 | 46 km | 11.0 mi | 0 |
| Dec 14, 2022 | EF2 | 33 km | 4.7 mi | 1 |
| Dec 14, 2022 | EF2 | 10 km | 10.6 mi | 0 |
| Jun 6, 2019 | EF2 | 65 km | 1.6 mi | 0 |
| Nov 1, 2018 | EF2 | 92 km | 2.3 mi | 0 |
| Feb 7, 2017 | EF2 | 57 km | 23.1 mi | 0 |
| Feb 23, 2016 | EF2 | 83 km | 4.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: KILN (BAYOU BACON) (3,576 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | KILN (BAYOU BACON) | 3,576 | 81 km |
| 2000 | UNIT 1 B | 2,030 | 30 km |
| 1998 | UNIT 4 CD | 1,729 | 42 km |
| 2015 | BAYOU LACROIX | 1,714 | 77 km |
| 2009 | SLIDELL AIRPORT | 1,663 | 55 km |
| 1998 | UNIT 7 | 1,623 | 39 km |
| 2008 | UNNAMED | 1,594 | 63 km |
| 2006 | UNNAMED | 1,482 | 94 km |
| 2011 | BAD ROMANCE | 1,305 | 27 km |
| 2011 | TONEY ISLAND | 1,215 | 76 km |
| 2006 | UNNAMED | 1,206 | 66 km |
| 2006 | UNNAMED | 1,111 | 94 km |
| 2004 | UNITS 1A-1B | 1,108 | 30 km |
| 2006 | UNNAMED | 1,102 | 72 km |
| 2006 | UNNAMED | 1,049 | 97 km |
| 2001 | UNNAMED | 950 | 47 km |
| 2010 | UNNAMED | 904 | 20 km |
| 2006 | UNNAMED | 866 | 75 km |
| 2009 | GOOSEPOINT C | 864 | 41 km |
| 1996 | 1 B | 846 | 28 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 55°F (13°C) | 5.4 in | Coldest |
| February | 56°F (13°C) | 5.5 in | |
| March | 62°F (17°C) | 5.3 in | |
| April | 68°F (20°C) | 4.6 in | |
| May | 76°F (24°C) | 5.0 in | |
| June | 81°F (27°C) | 5.6 in | |
| July | 85°F (30°C) | 6.7 in | Warmest, Wettest |
| August | 83°F (28°C) | 6.3 in | |
| September | 79°F (26°C) | 5.6 in | |
| October | 71°F (21°C) | 3.2 in | Driest |
| November | 62°F (17°C) | 4.7 in | |
| December | 56°F (13°C) | 5.1 in |
Jefferson has a seasonal temperature swing of 30°F / from 55°F in January to 85°F in July. Total annual precipitation is 62.9 inches, with July being the wettest month (6.7") and October the driest (3.2").