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Weather & Climate in Mer Rouge, LA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mer Rouge enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 44°F in January while summers reach 81°F in July. The area gets 304 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 58.4 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 91 feet.
Temperature
44°F Jan (7°C)
81°F Jul (27°C)
| Annual Average | 63.3°F |
| 17% above US avg | |
| January Average | 44°F (7°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 304 days/yr |
Geography
| Elevation | 91 ft (28 m) |
| Area | 0.5 sq mi (1.2 km²) |
| Population Density | 546/sq mi |
| Coordinates | 32.7769°N, 91.7944°W |
| Timezone | America/Chicago |
| County | Morehouse Parish County |
| Nearest Airport | Monroe Regional (MLU) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 55.3 / 100 |
| Social Vulnerability | 97.9 / 100 |
| Community Resilience | 43.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.
| Jan 8, 2019 | 8 km WNW of Hollandale, Mississippi | M3.7 | 93 km | 16 km |
| Jun 10, 1994 | 4 km E of Junction City, Arkansas | M3.2 | 86 km | 5 km |
| Aug 11, 1996 | 9 km WSW of Shaw, Mississippi | M3.1 | 124 km | 10 km |
| Mar 3, 2001 | 2 km SSE of El Dorado, Arkansas | M3.0 | 93 km | 5 km |
| May 16, 2007 | 5 km SW of Calion, Arkansas | M3.0 | 94 km | 5 km |
| Dec 17, 2001 | 3 km WSW of El Dorado, Arkansas | M2.8 | 97 km | 10 km |
| Jan 9, 1997 | 6 km E of El Dorado, Arkansas | M2.8 | 89 km | 5 km |
| Feb 24, 2020 | 12 km ENE of Junction City, Arkansas | M2.8 | 82 km | 14 km |
| May 11, 2020 | 13 km SSE of El Dorado, Arkansas | M2.8 | 84 km | 12 km |
| Apr 23, 2024 | 3 km N of Ringgold, Louisiana | M2.7 | 147 km | 5 km |
| Dec 24, 1997 | 7 km W of El Dorado, Arkansas | M2.6 | 101 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
6 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2021 | Ida | Category 2 | 75 mph | 260 km |
| 2020 | Laura | Category 3 | 98 mph | 150 km |
| 2008 | Gustav | Category 1 | — | 276 km |
| 2005 | Katrina | Category 3 | 121 mph | 245 km |
| 1992 | Andrew | Category 1 | 92 mph | 253 km |
| 1985 | Elena | Category 3 | 115 mph | 298 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
567 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 197 fatalities, 2,402 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Feb 21, 1971 | EF5 | 54 km | 109.2 mi | 47 |
| Dec 5, 1953 | EF5 | 97 km | 9.0 mi | 38 |
| Mar 24, 2023 | EF4 | 75 km | 59.2 mi | 17 |
| Apr 24, 2010 | EF4 | 62 km | 149.0 mi | 10 |
| Mar 9, 1992 | EF4 | 91 km | 20.0 mi | 0 |
| Apr 1, 1983 | EF4 | 25 km | 9.0 mi | 2 |
| Mar 28, 1975 | EF4 | 91 km | 5.4 mi | 7 |
| Feb 21, 1971 | EF4 | 73 km | 202.1 mi | 58 |
| Dec 13, 2022 | EF3 | 63 km | 9.1 mi | 0 |
| Nov 29, 2022 | EF3 | 93 km | 7.9 mi | 0 |
| Apr 12, 2020 | EF3 | 33 km | 2.6 mi | 0 |
| Apr 12, 2020 | EF3 | 49 km | 8.0 mi | 0 |
| Apr 25, 2019 | EF3 | 87 km | 11.2 mi | 2 |
| Feb 24, 2007 | EF3 | 91 km | 26.0 mi | 0 |
| Jan 12, 2005 | EF3 | 91 km | 24.0 mi | 2 |
| Nov 24, 2001 | EF3 | 8 km | 30.0 mi | 3 |
| Jan 21, 1999 | EF3 | 92 km | 22.0 mi | 0 |
| May 7, 1984 | EF3 | 56 km | 1.0 mi | 0 |
| Nov 19, 1983 | EF3 | 78 km | 2.0 mi | 0 |
| Nov 19, 1983 | EF3 | 95 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (4,134 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | UNNAMED | 4,134 | 44 km |
| 2006 | MOLLICY WARREN | 2,175 | 25 km |
| 2000 | UNNAMED | 2,042 | 66 km |
| 1996 | 007 CORNEY LAKE BED | 1,716 | 91 km |
| 2012 | LACEY | 1,439 | 78 km |
| 2010 | DREW | 1,283 | 75 km |
| 2006 | SHALLOW LAKE ROAD WEST 2 H | 1,146 | 53 km |
| 2013 | SINGLETON CREEK | 1,124 | 74 km |
| 2007 | BOULDIN HOUSE N 3F | 1,061 | 51 km |
| 2006 | UNNAMED | 1,057 | 51 km |
| 2011 | SHALLOW LAKE WEST | 900 | 53 km |
| 2000 | SHALLOW LAKE W | 892 | 53 km |
| 1986 | UNNAMED | 889 | 52 km |
| 1987 | UNNAMED | 839 | 51 km |
| 1989 | SHALLOW LAKE | 820 | 53 km |
| 1996 | RIDGE ROAD | 804 | 52 km |
| 2006 | PINE ISLAND | 757 | 49 km |
| 2014 | ARFSR-FY14-RX-JONES LAKE | 752 | 60 km |
| 1995 | BOULDINHSE | 748 | 51 km |
| 2007 | EAGLE LAKE | 742 | 53 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 44°F (7°C) | 5.1 in | Coldest |
| February | 49°F (9°C) | 5.3 in | |
| March | 56°F (13°C) | 5.8 in | Wettest |
| April | 64°F (18°C) | 4.9 in | |
| May | 72°F (22°C) | 5.5 in | |
| June | 79°F (26°C) | 4.3 in | |
| July | 81°F (27°C) | 3.6 in | Warmest |
| August | 81°F (27°C) | 3.2 in | |
| September | 76°F (24°C) | 3.0 in | Driest |
| October | 65°F (18°C) | 4.0 in | |
| November | 55°F (13°C) | 4.9 in | |
| December | 47°F (8°C) | 5.7 in |
Mer Rouge has a seasonal temperature swing of 37°F / from 44°F in January to 81°F in July. Total annual precipitation is 55.1 inches, with March being the wettest month (5.8") and September the driest (3.0").