Gretna weather by month
What a typical year looks like in Gretna, Louisiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at New Orleans Airport, 24 km from Gretna; records cover 1946–2026.
The year at a glance
- Precipitation a year
- 63.4 in1609 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 30
- First fall freeze
- Dec 10
- Heating degree days
- 1,176
- Cooling degree days
- 3,205
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 31°−1° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Gretna in January
Highs average 63°17° and lows 46°8°, with 5.2 in132 mm of precipitation in a typical January.
- Record high
- 83°28° (1957)
- Record low
- 14°−10° (1962)
- Heating degree days
- 350
- Cooling degree days
- 18
Gretna in February
Highs average 66°19° and lows 50°10°, with 4.1 in105 mm of precipitation in a typical February.
- Record high
- 86°30° (2026)
- Record low
- 16°−9° (1996)
- Heating degree days
- 226
- Cooling degree days
- 32
Gretna in March
Highs average 72°22° and lows 55°13°, with 4.4 in111 mm of precipitation in a typical March.
- Record high
- 89°32° (1982)
- Record low
- 25°−4° (1980)
- Heating degree days
- 118
- Cooling degree days
- 81
Gretna in April
Highs average 79°26° and lows 62°17°, with 5.2 in133 mm of precipitation in a typical April.
- Record high
- 92°33° (1987)
- Record low
- 32°0° (1971)
- Heating degree days
- 27
- Cooling degree days
- 180
Gretna in May
Highs average 85°30° and lows 69°21°, with 5.6 in143 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 41°5° (1960)
- Heating degree days
- 1
- Cooling degree days
- 378
Gretna in June
Highs average 90°32° and lows 75°24°, with 7.6 in194 mm of precipitation in a typical June.
- Record high
- 101°38° (2009)
- Record low
- 50°10° (1984)
- Heating degree days
- 0
- Cooling degree days
- 520
Gretna in July
Highs average 91°33° and lows 77°25°, with 6.8 in172 mm of precipitation in a typical July.
- Record high
- 101°38° (1980)
- Record low
- 60°16° (1967)
- Heating degree days
- 0
- Cooling degree days
- 587
Gretna in August
Highs average 91°33° and lows 77°25°, with 6.9 in176 mm of precipitation in a typical August.
- Record high
- 105°41° (2023)
- Record low
- 60°16° (1968)
- Heating degree days
- 0
- Cooling degree days
- 587
Gretna in September
Highs average 88°31° and lows 74°23°, with 5.1 in130 mm of precipitation in a typical September.
- Record high
- 101°38° (1980)
- Record low
- 42°6° (1967)
- Heating degree days
- 0
- Cooling degree days
- 474
Gretna in OctoberThis month
Highs average 81°27° and lows 64°18°, with 3.7 in94 mm of precipitation in a typical October.
- Record high
- 97°36° (2019)
- Record low
- 35°2° (1968)
- Heating degree days
- 21
- Cooling degree days
- 252
Gretna in November
Highs average 71°22° and lows 54°12°, with 3.9 in98 mm of precipitation in a typical November.
- Record high
- 88°31° (2016)
- Record low
- 24°−4° (1970)
- Heating degree days
- 143
- Cooling degree days
- 66
Gretna in December
Highs average 65°18° and lows 48°9°, with 4.8 in122 mm of precipitation in a typical December.
- Record high
- 85°29° (2017)
- Record low
- 11°−12° (1989)
- Heating degree days
- 290
- Cooling degree days
- 30