Olean weather by month
What a typical year looks like in Olean, New York: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at OLEAN, 2 km from Olean; records cover 1927–2026.
The year at a glance
- Precipitation a year
- 40.7 in1033 mm
- Snow a year
- 65 in164 cm
- Last spring freeze
- May 12
- First fall freeze
- Oct 13
- Heating degree days
- 7,121
- Cooling degree days
- 357
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −6°−21° (heating, 99%) and 89°32° (cooling, 1%).
Month by month
Olean in January
Highs average 32°0° and lows 13°−10°, with 2.7 in69 mm of precipitation and 18 in45 cm of snow in a typical January.
- Record high
- 66°19° (2008)
- Record low
- −22°−30° (2022)
- Heating degree days
- 1320
- Cooling degree days
- 0
Olean in February
Highs average 34°1° and lows 15°−10°, with 2 in50 mm of precipitation and 14 in35 cm of snow in a typical February.
- Record high
- 73°23° (2017)
- Record low
- −21°−29° (2015)
- Heating degree days
- 1131
- Cooling degree days
- 0
Olean in March
Highs average 43°6° and lows 21°−6°, with 2.6 in67 mm of precipitation and 10 in26 cm of snow in a typical March.
- Record high
- 80°27° (2012)
- Record low
- −16°−27° (2015)
- Heating degree days
- 1020
- Cooling degree days
- 0
Olean in April
Highs average 57°14° and lows 32°0°, with 3.4 in85 mm of precipitation and 1.8 in4.6 cm of snow in a typical April.
- Record high
- 87°31° (2002)
- Record low
- 15°−9° (2007)
- Heating degree days
- 617
- Cooling degree days
- 1
Olean in May
Highs average 68°20° and lows 44°7°, with 3.7 in93 mm of precipitation in a typical May.
- Record high
- 92°33° (2006)
- Record low
- 23°−5° (2020)
- Heating degree days
- 296
- Cooling degree days
- 17
Olean in June
Highs average 76°24° and lows 53°11°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 92°33° (2005)
- Record low
- 30°−1° (1967)
- Heating degree days
- 82
- Cooling degree days
- 60
Olean in July
Highs average 80°27° and lows 57°14°, with 4.3 in109 mm of precipitation in a typical July.
- Record high
- 99°37° (2011)
- Record low
- 42°6° (2001)
- Heating degree days
- 22
- Cooling degree days
- 135
Olean in August
Highs average 79°26° and lows 55°13°, with 4 in102 mm of precipitation in a typical August.
- Record high
- 93°34° (2001)
- Record low
- 41°5° (2025)
- Heating degree days
- 37
- Cooling degree days
- 99
Olean in September
Highs average 73°23° and lows 49°9°, with 3.9 in98 mm of precipitation in a typical September.
- Record high
- 94°34° (2002)
- Record low
- 30°−1° (2020)
- Heating degree days
- 168
- Cooling degree days
- 42
Olean in OctoberThis month
Highs average 60°15° and lows 38°4°, with 3.6 in91 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 86°30° (2019)
- Record low
- 17°−8° (2018)
- Heating degree days
- 496
- Cooling degree days
- 3
Olean in November
Highs average 47°8° and lows 29°−2°, with 2.9 in73 mm of precipitation and 6 in16 cm of snow in a typical November.
- Record high
- 78°26° (2015)
- Record low
- −2°−19° (2018)
- Heating degree days
- 813
- Cooling degree days
- 0
Olean in December
Highs average 37°3° and lows 21°−6°, with 3.2 in82 mm of precipitation and 15 in38 cm of snow in a typical December.
- Record high
- 70°21° (2001)
- Record low
- −12°−24° (2017)
- Heating degree days
- 1119
- Cooling degree days
- 0