Guymon weather by month
What a typical year looks like in Guymon, Oklahoma: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Goodwell Research Station, 17 km from Guymon; records cover 1910–2026.
The year at a glance
- Precipitation a year
- 16.7 in425 mm
- Snow a year
- 2.7 in6.9 cm
- Last spring freeze
- Apr 18
- First fall freeze
- Oct 14
- Heating degree days
- 4,672
- Cooling degree days
- 1,380
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 5°−15° (heating, 99%) and 104°40° (cooling, 1%).
Month by month
Guymon in January
Highs average 49°9° and lows 20°−7°, with 0.38 in9.7 mm of precipitation and 0.9 in2.3 cm of snow in a typical January.
- Record high
- 83°28° (1911)
- Record low
- −22°−30° (1959)
- Heating degree days
- 950
- Cooling degree days
- 0
Guymon in February
Highs average 52°11° and lows 22°−5°, with 0.32 in8.1 mm of precipitation and 0.1 in0.3 cm of snow in a typical February.
- Record high
- 90°32° (2017)
- Record low
- −19°−28° (2021)
- Heating degree days
- 776
- Cooling degree days
- 0
Guymon in March
Highs average 61°16° and lows 31°−1°, with 1.1 in28 mm of precipitation and 0.9 in2.3 cm of snow in a typical March.
- Record high
- 102°39° (2026)
- Record low
- −9°−23° (1920)
- Heating degree days
- 598
- Cooling degree days
- 1
Guymon in April
Highs average 69°21° and lows 39°4°, with 1.5 in37 mm of precipitation in a typical April.
- Record high
- 100°38° (1989)
- Record low
- 8°−13° (1936)
- Heating degree days
- 342
- Cooling degree days
- 12
Guymon in May
Highs average 79°26° and lows 49°10°, with 1.9 in49 mm of precipitation in a typical May.
- Record high
- 104°40° (1916)
- Record low
- 24°−4° (2013)
- Heating degree days
- 119
- Cooling degree days
- 88
Guymon in June
Highs average 89°32° and lows 60°15°, with 2.4 in61 mm of precipitation in a typical June.
- Record high
- 112°44° (2011)
- Record low
- 38°3° (1919)
- Heating degree days
- 8
- Cooling degree days
- 290
Guymon in July
Highs average 93°34° and lows 64°18°, with 2.6 in66 mm of precipitation in a typical July.
- Record high
- 110°43° (2009)
- Record low
- 41°5° (1915)
- Heating degree days
- 1
- Cooling degree days
- 424
Guymon in August
Highs average 91°33° and lows 63°17°, with 2.6 in66 mm of precipitation in a typical August.
- Record high
- 109°43° (1936)
- Record low
- 40°4° (1920)
- Heating degree days
- 3
- Cooling degree days
- 370
Guymon in September
Highs average 84°29° and lows 55°13°, with 1.3 in34 mm of precipitation in a typical September.
- Record high
- 109°43° (1995)
- Record low
- 28°−2° (1985)
- Heating degree days
- 47
- Cooling degree days
- 172
Guymon in OctoberThis month
Highs average 72°22° and lows 41°5°, with 1.7 in43 mm of precipitation in a typical October.
- Record high
- 100°38° (1916)
- Record low
- 10°−12° (2019)
- Heating degree days
- 281
- Cooling degree days
- 22
Guymon in November
Highs average 59°15° and lows 30°−1°, with 0.37 in9.4 mm of precipitation in a typical November.
- Record high
- 89°32° (1915)
- Record low
- −5°−21° (1976)
- Heating degree days
- 613
- Cooling degree days
- 1
Guymon in December
Highs average 49°9° and lows 21°−6°, with 0.61 in15 mm of precipitation and 0.8 in2 cm of snow in a typical December.
- Record high
- 86°30° (2025)
- Record low
- −16°−27° (1924)
- Heating degree days
- 934
- Cooling degree days
- 0