Average Annual Louisiana Temp °F Gulf Coast Hi , Low , Town 77 , 63 , Boothville 78 , 58 , Crowley 79 , 60 , Houma 79 , 60 , Lafayette 78 , 59 , Lake Charles 78 , 60 , Morgan City 79 , 59 , New Iberia 78 , 61 , New Orleans 76 , 60 , Rockefeller WR Florida Parishes Hi , Low , Town 79 , 58 , Baton Rouge 78 , 56 , Bogalusa 78 , 56 , Hammond 79 , 57 , New Roads 77 , 58 , Slidell Central Louisiana Hi , Low , Town 77 , 57 , Alexandria 77 , 54 , Leesville 78 , 56 , Natchitoches 77 , 53 , Winnfield North Louisiana Hi , Low , Town 75 , 54 , Lake Providence 76 , 52 , Monroe 75 , 52 , Ruston 77 , 55 , Shreveport National Climatic Data Center. NOAA's 1981-2010 Climate Normals. | 1 | 2 | 3 |