Isabella weather by month
What a typical year looks like in Isabella, Oklahoma: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Fairview 5nw Mesonet, 22 km from Isabella; records cover 2007–2026.
The year at a glance
- Precipitation a year
- 31.1 in789 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 7
- First fall freeze
- Oct 31
- Heating degree days
- 3,869
- Cooling degree days
- 2,047
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 10°−12° (heating, 99%) and 106°41° (cooling, 1%).
Month by month
Isabella in January
Highs average 49°9° and lows 26°−3°, with 0.91 in23 mm of precipitation in a typical January.
- Record high
- 81°27° (2015)
- Record low
- −8°−22° (2025)
- Heating degree days
- 856
- Cooling degree days
- 0
Isabella in February
Highs average 53°11° and lows 28°−2°, with 1.2 in30 mm of precipitation in a typical February.
- Record high
- 92°33° (2017)
- Record low
- −15°−26° (2011)
- Heating degree days
- 693
- Cooling degree days
- 1
Isabella in March
Highs average 62°17° and lows 37°3°, with 2.2 in55 mm of precipitation in a typical March.
- Record high
- 98°37° (2026)
- Record low
- −1°−18° (2014)
- Heating degree days
- 488
- Cooling degree days
- 8
Isabella in April
Highs average 71°22° and lows 46°8°, with 3.1 in79 mm of precipitation in a typical April.
- Record high
- 97°36° (2022)
- Record low
- 21°−6° (2018)
- Heating degree days
- 229
- Cooling degree days
- 37
Isabella in May
Highs average 81°27° and lows 57°14°, with 4.2 in107 mm of precipitation in a typical May.
- Record high
- 104°40° (2011)
- Record low
- 34°1° (2013)
- Heating degree days
- 64
- Cooling degree days
- 179
Isabella in June
Highs average 91°33° and lows 67°19°, with 4.5 in115 mm of precipitation in a typical June.
- Record high
- 109°43° (2011)
- Record low
- 50°10° (2012)
- Heating degree days
- 1
- Cooling degree days
- 411
Isabella in July
Highs average 96°35° and lows 71°22°, with 3.2 in82 mm of precipitation in a typical July.
- Record high
- 112°44° (2011)
- Record low
- 54°12° (2019)
- Heating degree days
- 0
- Cooling degree days
- 561
Isabella in August
Highs average 93°34° and lows 70°21°, with 3.3 in84 mm of precipitation in a typical August.
- Record high
- 113°45° (2012)
- Record low
- 50°10° (2010)
- Heating degree days
- 0
- Cooling degree days
- 505
Isabella in September
Highs average 86°30° and lows 61°16°, with 2.6 in67 mm of precipitation in a typical September.
- Record high
- 108°42° (2026)
- Record low
- 42°6° (2009)
- Heating degree days
- 18
- Cooling degree days
- 273
Isabella in OctoberThis month
Highs average 74°23° and lows 48°9°, with 2.9 in73 mm of precipitation in a typical October.
- Record high
- 97°36° (2021)
- Record low
- 19°−7° (2019)
- Heating degree days
- 194
- Cooling degree days
- 68
Isabella in November
Highs average 60°16° and lows 37°3°, with 1.6 in41 mm of precipitation in a typical November.
- Record high
- 89°32° (2012)
- Record low
- 11°−12° (2019)
- Heating degree days
- 508
- Cooling degree days
- 4
Isabella in December
Highs average 49°10° and lows 28°−2°, with 1.3 in34 mm of precipitation in a typical December.
- Record high
- 84°29° (2025)
- Record low
- −2°−19° (2016)
- Heating degree days
- 818
- Cooling degree days
- 0