Stillwater weather by month
What a typical year looks like in Stillwater, Oklahoma: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Stillwater Regional Airport, 4 km from Stillwater; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 33.2 in843 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 7
- First fall freeze
- Oct 26
- Heating degree days
- 3,449
- Cooling degree days
- 2,194
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 105°41° (cooling, 1%).
Month by month
Stillwater in January
Highs average 51°10° and lows 27°−3°, with 0.92 in23 mm of precipitation in a typical January.
- Record high
- 82°28° (2015)
- Record low
- −12°−24° (1918)
- Heating degree days
- 815
- Cooling degree days
- 0
Stillwater in February
Highs average 56°13° and lows 31°−1°, with 1.3 in34 mm of precipitation in a typical February.
- Record high
- 92°33° (1996)
- Record low
- −21°−29° (2011)
- Heating degree days
- 615
- Cooling degree days
- 2
Stillwater in March
Highs average 65°18° and lows 40°4°, with 2.2 in56 mm of precipitation in a typical March.
- Record high
- 98°37° (1907)
- Record low
- −5°−21° (1948)
- Heating degree days
- 416
- Cooling degree days
- 18
Stillwater in April
Highs average 73°23° and lows 49°9°, with 3.7 in94 mm of precipitation in a typical April.
- Record high
- 104°40° (1972)
- Record low
- 16°−9° (1936)
- Heating degree days
- 185
- Cooling degree days
- 63
Stillwater in May
Highs average 81°27° and lows 59°15°, with 4.6 in116 mm of precipitation in a typical May.
- Record high
- 101°38° (1985)
- Record low
- 29°−2° (1903)
- Heating degree days
- 41
- Cooling degree days
- 186
Stillwater in June
Highs average 90°32° and lows 68°20°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 106°41° (1936)
- Record low
- 43°6° (1919)
- Heating degree days
- 1
- Cooling degree days
- 409
Stillwater in July
Highs average 95°35° and lows 72°22°, with 3.1 in79 mm of precipitation in a typical July.
- Record high
- 113°45° (1936)
- Record low
- 50°10° (1894)
- Heating degree days
- 0
- Cooling degree days
- 581
Stillwater in August
Highs average 95°35° and lows 71°21°, with 3.3 in83 mm of precipitation in a typical August.
- Record high
- 115°46° (1936)
- Record low
- 43°6° (1915)
- Heating degree days
- 0
- Cooling degree days
- 550
Stillwater in September
Highs average 87°30° and lows 62°17°, with 3.1 in79 mm of precipitation in a typical September.
- Record high
- 110°43° (1939)
- Record low
- 31°−1° (1984)
- Heating degree days
- 16
- Cooling degree days
- 295
Stillwater in OctoberThis month
Highs average 75°24° and lows 49°10°, with 2.9 in75 mm of precipitation in a typical October.
- Record high
- 99°37° (1898)
- Record low
- 12°−11° (1917)
- Heating degree days
- 163
- Cooling degree days
- 81
Stillwater in November
Highs average 63°17° and lows 38°3°, with 2 in50 mm of precipitation in a typical November.
- Record high
- 90°32° (2023)
- Record low
- 7°−14° (1894)
- Heating degree days
- 449
- Cooling degree days
- 8
Stillwater in December
Highs average 52°11° and lows 30°−1°, with 1.5 in38 mm of precipitation in a typical December.
- Record high
- 85°29° (2025)
- Record low
- −15°−26° (1989)
- Heating degree days
- 748
- Cooling degree days
- 1