Allen weather by month
What a typical year looks like in Allen, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at RICHARDSON, 14 km from Allen; records cover 1965–2026.
The year at a glance
- Precipitation a year
- 41.9 in1065 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 5
- First fall freeze
- Nov 21
- Heating degree days
- 2,295
- Cooling degree days
- 2,614
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 21°−6° (heating, 99%) and 103°39° (cooling, 1%).
Month by month
Allen in January
Highs average 56°13° and lows 36°2°, with 2.8 in71 mm of precipitation in a typical January.
- Record high
- 82°28° (2023)
- Record low
- 6°−14° (2024)
- Heating degree days
- 595
- Cooling degree days
- 2
Allen in February
Highs average 60°16° and lows 40°4°, with 3.4 in86 mm of precipitation in a typical February.
- Record high
- 91°33° (2024)
- Record low
- 0°−18° (2021)
- Heating degree days
- 433
- Cooling degree days
- 6
Allen in March
Highs average 69°20° and lows 48°9°, with 3.6 in90 mm of precipitation in a typical March.
- Record high
- 92°33° (2026)
- Record low
- 13°−11° (1980)
- Heating degree days
- 247
- Cooling degree days
- 31
Allen in April
Highs average 75°24° and lows 55°13°, with 3.5 in89 mm of precipitation in a typical April.
- Record high
- 99°37° (2006)
- Record low
- 32°0° (2018)
- Heating degree days
- 90
- Cooling degree days
- 93
Allen in May
Highs average 83°28° and lows 64°18°, with 5.2 in132 mm of precipitation in a typical May.
- Record high
- 100°38° (2003)
- Record low
- 38°3° (2013)
- Heating degree days
- 13
- Cooling degree days
- 264
Allen in June
Highs average 90°32° and lows 71°22°, with 3.8 in97 mm of precipitation in a typical June.
- Record high
- 112°44° (1980)
- Record low
- 10°−12° (2001)
- Heating degree days
- 0
- Cooling degree days
- 468
Allen in July
Highs average 94°35° and lows 75°24°, with 2.2 in56 mm of precipitation in a typical July.
- Record high
- 107°42° (2018)
- Record low
- 5°−15° (2002)
- Heating degree days
- 0
- Cooling degree days
- 614
Allen in August
Highs average 95°35° and lows 75°24°, with 2.5 in63 mm of precipitation in a typical August.
- Record high
- 109°43° (2024)
- Record low
- 59°15° (2015)
- Heating degree days
- 0
- Cooling degree days
- 609
Allen in September
Highs average 87°31° and lows 67°19°, with 3.3 in84 mm of precipitation in a typical September.
- Record high
- 109°43° (2000)
- Record low
- 6°−14° (2002)
- Heating degree days
- 3
- Cooling degree days
- 369
Allen in OctoberThis month
Highs average 78°25° and lows 56°13°, with 5.3 in134 mm of precipitation in a typical October.
- Record high
- 100°38° (1979)
- Record low
- 29°−2° (2019)
- Heating degree days
- 78
- Cooling degree days
- 134
Allen in November
Highs average 66°19° and lows 46°8°, with 3 in77 mm of precipitation in a typical November.
- Record high
- 90°32° (2017)
- Record low
- 21°−6° (2019)
- Heating degree days
- 294
- Cooling degree days
- 20
Allen in December
Highs average 57°14° and lows 38°3°, with 3.4 in86 mm of precipitation in a typical December.
- Record high
- 87°31° (2005)
- Record low
- 9°−13° (2022)
- Heating degree days
- 542
- Cooling degree days
- 4