Cornish weather by month
What a typical year looks like in Cornish, Oklahoma: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Healdton 3 E, 18 km from Cornish; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 37 in940 mm
- Snow a year
- 2.2 in5.6 cm
- Last spring freeze
- Apr 2
- First fall freeze
- Nov 4
- Heating degree days
- 3,355
- Cooling degree days
- 1,998
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 13°−11° (heating, 99%) and 104°40° (cooling, 1%).
Month by month
Cornish in January
Highs average 53°11° and lows 27°−3°, with 1.8 in44 mm of precipitation and 0.6 in1.5 cm of snow in a typical January.
- Record high
- 90°32° (1911)
- Record low
- −10°−23° (1977)
- Heating degree days
- 789
- Cooling degree days
- 0
Cornish in February
Highs average 57°14° and lows 31°−1°, with 2.1 in52 mm of precipitation and 0.5 in1.3 cm of snow in a typical February.
- Record high
- 94°34° (1918)
- Record low
- −17°−27° (2021)
- Heating degree days
- 589
- Cooling degree days
- 1
Cornish in March
Highs average 65°18° and lows 39°4°, with 2.8 in70 mm of precipitation and 0.1 in0.3 cm of snow in a typical March.
- Record high
- 99°37° (1904)
- Record low
- 1°−17° (1989)
- Heating degree days
- 416
- Cooling degree days
- 10
Cornish in April
Highs average 74°23° and lows 47°8°, with 3.3 in83 mm of precipitation in a typical April.
- Record high
- 98°37° (1972)
- Record low
- 19°−7° (1915)
- Heating degree days
- 183
- Cooling degree days
- 45
Cornish in May
Highs average 81°27° and lows 57°14°, with 5.2 in132 mm of precipitation in a typical May.
- Record high
- 102°39° (1896)
- Record low
- 24°−4° (1903)
- Heating degree days
- 45
- Cooling degree days
- 170
Cornish in June
Highs average 89°32° and lows 66°19°, with 3.9 in100 mm of precipitation in a typical June.
- Record high
- 114°46° (1980)
- Record low
- 38°3° (1896)
- Heating degree days
- 1
- Cooling degree days
- 379
Cornish in July
Highs average 95°35° and lows 69°21°, with 2.8 in72 mm of precipitation in a typical July.
- Record high
- 112°44° (1980)
- Record low
- 50°10° (1971)
- Heating degree days
- 0
- Cooling degree days
- 528
Cornish in August
Highs average 95°35° and lows 68°20°, with 2.6 in67 mm of precipitation in a typical August.
- Record high
- 115°46° (1896)
- Record low
- 45°7° (1906)
- Heating degree days
- 0
- Cooling degree days
- 510
Cornish in September
Highs average 87°30° and lows 60°16°, with 3.7 in94 mm of precipitation in a typical September.
- Record high
- 111°44° (2000)
- Record low
- 31°−1° (1909)
- Heating degree days
- 19
- Cooling degree days
- 275
Cornish in OctoberThis month
Highs average 76°25° and lows 48°9°, with 3.9 in98 mm of precipitation in a typical October.
- Record high
- 101°38° (1898)
- Record low
- 10°−12° (1917)
- Heating degree days
- 158
- Cooling degree days
- 73
Cornish in November
Highs average 64°18° and lows 38°3°, with 2.7 in68 mm of precipitation and 0.2 in0.5 cm of snow in a typical November.
- Record high
- 90°32° (2025)
- Record low
- 7°−14° (1911)
- Heating degree days
- 429
- Cooling degree days
- 7
Cornish in December
Highs average 54°12° and lows 29°−2°, with 2.4 in60 mm of precipitation and 0.8 in2 cm of snow in a typical December.
- Record high
- 83°28° (2021)
- Record low
- −10°−23° (1989)
- Heating degree days
- 726
- Cooling degree days
- 0