Old Jefferson weather by month
What a typical year looks like in Old Jefferson, Louisiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Baton Rouge Metro Airport, 22 km from Old Jefferson; records cover 1892–2026.
The year at a glance
- Precipitation a year
- 61.9 in1573 mm
- Snow a year
- 0.2 in0.5 cm
- Last spring freeze
- Feb 18
- First fall freeze
- Nov 25
- Heating degree days
- 1,535
- Cooling degree days
- 2,817
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 27°−3° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Old Jefferson in January
Highs average 62°17° and lows 42°5°, with 6.4 in162 mm of precipitation in a typical January.
- Record high
- 85°29° (1909)
- Record low
- 7°−14° (2025)
- Heating degree days
- 418
- Cooling degree days
- 13
Old Jefferson in February
Highs average 67°19° and lows 45°7°, with 4.4 in112 mm of precipitation in a typical February.
- Record high
- 88°31° (1922)
- Record low
- 2°−17° (1899)
- Heating degree days
- 279
- Cooling degree days
- 25
Old Jefferson in March
Highs average 73°23° and lows 51°11°, with 4.5 in113 mm of precipitation in a typical March.
- Record high
- 93°34° (1909)
- Record low
- 20°−7° (1980)
- Heating degree days
- 158
- Cooling degree days
- 65
Old Jefferson in April
Highs average 79°26° and lows 57°14°, with 5.1 in129 mm of precipitation in a typical April.
- Record high
- 96°36° (1908)
- Record low
- 31°−1° (1940)
- Heating degree days
- 51
- Cooling degree days
- 141
Old Jefferson in May
Highs average 86°30° and lows 65°18°, with 5.2 in133 mm of precipitation in a typical May.
- Record high
- 101°38° (1922)
- Record low
- 40°4° (1908)
- Heating degree days
- 4
- Cooling degree days
- 328
Old Jefferson in June
Highs average 91°33° and lows 72°22°, with 6.5 in164 mm of precipitation in a typical June.
- Record high
- 103°39° (1914)
- Record low
- 53°12° (1984)
- Heating degree days
- 0
- Cooling degree days
- 480
Old Jefferson in July
Highs average 92°33° and lows 74°23°, with 5.1 in129 mm of precipitation in a typical July.
- Record high
- 103°39° (1901)
- Record low
- 58°14° (1967)
- Heating degree days
- 0
- Cooling degree days
- 553
Old Jefferson in August
Highs average 92°33° and lows 73°23°, with 6.4 in162 mm of precipitation in a typical August.
- Record high
- 110°43° (1909)
- Record low
- 58°14° (2004)
- Heating degree days
- 0
- Cooling degree days
- 550
Old Jefferson in September
Highs average 89°32° and lows 69°21°, with 4.4 in112 mm of precipitation in a typical September.
- Record high
- 104°40° (2000)
- Record low
- 43°6° (1908)
- Heating degree days
- 1
- Cooling degree days
- 415
Old Jefferson in OctoberThis month
Highs average 81°27° and lows 58°15°, with 4.8 in123 mm of precipitation in a typical October.
- Record high
- 98°37° (1904)
- Record low
- 30°−1° (1993)
- Heating degree days
- 45
- Cooling degree days
- 184
Old Jefferson in November
Highs average 71°22° and lows 48°9°, with 3.9 in99 mm of precipitation in a typical November.
- Record high
- 91°33° (2024)
- Record low
- 21°−6° (1976)
- Heating degree days
- 210
- Cooling degree days
- 42
Old Jefferson in December
Highs average 64°18° and lows 43°6°, with 5.3 in135 mm of precipitation and 0.2 in0.5 cm of snow in a typical December.
- Record high
- 88°31° (1894)
- Record low
- 8°−13° (1989)
- Heating degree days
- 369
- Cooling degree days
- 21