Sam Rayburn weather by month
What a typical year looks like in Sam Rayburn, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Sam Rayburn Dam, 7 km from Sam Rayburn; records cover 1968–2026.
The year at a glance
- Precipitation a year
- 60 in1525 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 5
- First fall freeze
- Nov 17
- Heating degree days
- 1,671
- Cooling degree days
- 2,988
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 24°−4° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Sam Rayburn in January
Highs average 60°16° and lows 41°5°, with 5.6 in142 mm of precipitation in a typical January.
- Record high
- 83°28° (1971)
- Record low
- 11°−12° (1982)
- Heating degree days
- 454
- Cooling degree days
- 11
Sam Rayburn in February
Highs average 64°18° and lows 45°7°, with 4.8 in121 mm of precipitation in a typical February.
- Record high
- 88°31° (1986)
- Record low
- 14°−10° (1996)
- Heating degree days
- 318
- Cooling degree days
- 22
Sam Rayburn in March
Highs average 71°22° and lows 51°11°, with 5.4 in138 mm of precipitation in a typical March.
- Record high
- 93°34° (2012)
- Record low
- 19°−7° (1980)
- Heating degree days
- 180
- Cooling degree days
- 64
Sam Rayburn in April
Highs average 78°26° and lows 58°14°, with 4.6 in118 mm of precipitation in a typical April.
- Record high
- 93°34° (1987)
- Record low
- 24°−4° (1999)
- Heating degree days
- 60
- Cooling degree days
- 145
Sam Rayburn in May
Highs average 85°30° and lows 66°19°, with 4.5 in115 mm of precipitation in a typical May.
- Record high
- 101°38° (1998)
- Record low
- 38°3° (1992)
- Heating degree days
- 5
- Cooling degree days
- 338
Sam Rayburn in June
Highs average 91°33° and lows 73°23°, with 5.5 in141 mm of precipitation in a typical June.
- Record high
- 103°39° (1990)
- Record low
- 50°10° (1984)
- Heating degree days
- 0
- Cooling degree days
- 508
Sam Rayburn in July
Highs average 94°34° and lows 75°24°, with 3.5 in89 mm of precipitation in a typical July.
- Record high
- 107°42° (2000)
- Record low
- 59°15° (1968)
- Heating degree days
- 0
- Cooling degree days
- 601
Sam Rayburn in August
Highs average 95°35° and lows 74°24°, with 5 in126 mm of precipitation in a typical August.
- Record high
- 107°42° (1998)
- Record low
- 52°11° (1992)
- Heating degree days
- 0
- Cooling degree days
- 603
Sam Rayburn in September
Highs average 89°32° and lows 70°21°, with 4.4 in113 mm of precipitation in a typical September.
- Record high
- 109°43° (2000)
- Record low
- 39°4° (1993)
- Heating degree days
- 2
- Cooling degree days
- 444
Sam Rayburn in OctoberThis month
Highs average 81°27° and lows 59°15°, with 5.2 in133 mm of precipitation in a typical October.
- Record high
- 95°35° (1977)
- Record low
- 20°−7° (1993)
- Heating degree days
- 46
- Cooling degree days
- 190
Sam Rayburn in November
Highs average 70°21° and lows 50°10°, with 5.3 in134 mm of precipitation in a typical November.
- Record high
- 87°31° (1972)
- Record low
- 18°−8° (1976)
- Heating degree days
- 207
- Cooling degree days
- 47
Sam Rayburn in December
Highs average 62°17° and lows 43°6°, with 6.1 in155 mm of precipitation in a typical December.
- Record high
- 85°29° (1970)
- Record low
- 7°−14° (1989)
- Heating degree days
- 399
- Cooling degree days
- 15