Seymour weather by month
What a typical year looks like in Seymour, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Lake Kemp, 21 km from Seymour; records cover 1962–2026.
The year at a glance
- Precipitation a year
- 25.1 in639 mm
- Snow a year
- 2.1 in5.3 cm
- Last spring freeze
- Mar 15
- First fall freeze
- Nov 17
- Heating degree days
- 2,891
- Cooling degree days
- 2,517
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 16°−9° (heating, 99%) and 107°42° (cooling, 1%).
Month by month
Seymour in January
Highs average 54°12° and lows 31°−1°, with 1.1 in28 mm of precipitation and 0.5 in1.3 cm of snow in a typical January.
- Record high
- 87°31° (2006)
- Record low
- 1°−17° (1963)
- Heating degree days
- 707
- Cooling degree days
- 0
Seymour in February
Highs average 58°14° and lows 34°1°, with 1.4 in35 mm of precipitation and 0.3 in0.8 cm of snow in a typical February.
- Record high
- 93°34° (2017)
- Record low
- −4°−20° (2021)
- Heating degree days
- 539
- Cooling degree days
- 2
Seymour in March
Highs average 67°19° and lows 42°6°, with 1.8 in46 mm of precipitation in a typical March.
- Record high
- 101°38° (2026)
- Record low
- 9°−13° (1980)
- Heating degree days
- 344
- Cooling degree days
- 19
Seymour in April
Highs average 76°24° and lows 50°10°, with 1.9 in48 mm of precipitation in a typical April.
- Record high
- 107°42° (2012)
- Record low
- 27°−3° (2018)
- Heating degree days
- 138
- Cooling degree days
- 77
Seymour in May
Highs average 84°29° and lows 61°16°, with 3.6 in91 mm of precipitation in a typical May.
- Record high
- 113°45° (2000)
- Record low
- 33°1° (1978)
- Heating degree days
- 25
- Cooling degree days
- 252
Seymour in June
Highs average 92°33° and lows 69°21°, with 3.2 in82 mm of precipitation in a typical June.
- Record high
- 115°46° (1980)
- Record low
- 47°8° (1990)
- Heating degree days
- 0
- Cooling degree days
- 472
Seymour in July
Highs average 97°36° and lows 74°23°, with 2.1 in54 mm of precipitation in a typical July.
- Record high
- 113°45° (1980)
- Record low
- 58°14° (1995)
- Heating degree days
- 0
- Cooling degree days
- 622
Seymour in August
Highs average 96°36° and lows 73°23°, with 2.1 in53 mm of precipitation in a typical August.
- Record high
- 113°45° (2023)
- Record low
- 53°12° (1966)
- Heating degree days
- 0
- Cooling degree days
- 600
Seymour in September
Highs average 88°31° and lows 65°18°, with 2.6 in66 mm of precipitation in a typical September.
- Record high
- 111°44° (2023)
- Record low
- 36°2° (1983)
- Heating degree days
- 10
- Cooling degree days
- 344
Seymour in OctoberThis month
Highs average 77°25° and lows 53°12°, with 2.6 in66 mm of precipitation in a typical October.
- Record high
- 106°41° (1977)
- Record low
- 22°−6° (1993)
- Heating degree days
- 107
- Cooling degree days
- 116
Seymour in November
Highs average 64°18° and lows 42°5°, with 1.6 in40 mm of precipitation and 0.7 in1.8 cm of snow in a typical November.
- Record high
- 92°33° (2025)
- Record low
- 13°−11° (1986)
- Heating degree days
- 370
- Cooling degree days
- 13
Seymour in December
Highs average 55°13° and lows 33°0°, with 1.2 in30 mm of precipitation and 0.6 in1.5 cm of snow in a typical December.
- Record high
- 88°31° (2021)
- Record low
- −6°−21° (1989)
- Heating degree days
- 651
- Cooling degree days
- 0