Flat Rock weather by month
What a typical year looks like in Flat Rock, Ohio: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at NORWALK WWTP, 21 km from Flat Rock; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 40.1 in1018 mm
- Snow a year
- 33 in83 cm
- Last spring freeze
- Apr 26
- First fall freeze
- Oct 21
- Heating degree days
- 6,085
- Cooling degree days
- 826
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −2°−19° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Flat Rock in January
Highs average 33°1° and lows 19°−7°, with 2.7 in68 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 72°22° (1906)
- Record low
- −23°−31° (1912)
- Heating degree days
- 1203
- Cooling degree days
- 0
Flat Rock in February
Highs average 36°2° and lows 20°−6°, with 2.3 in59 mm of precipitation and 8 in21 cm of snow in a typical February.
- Record high
- 75°24° (2017)
- Record low
- −25°−32° (1929)
- Heating degree days
- 1028
- Cooling degree days
- 0
Flat Rock in March
Highs average 46°8° and lows 28°−2°, with 2.9 in74 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 85°29° (1910)
- Record low
- −15°−26° (1948)
- Heating degree days
- 878
- Cooling degree days
- 1
Flat Rock in April
Highs average 59°15° and lows 38°3°, with 4 in100 mm of precipitation and 1.6 in4.1 cm of snow in a typical April.
- Record high
- 92°33° (1896)
- Record low
- 7°−14° (1982)
- Heating degree days
- 506
- Cooling degree days
- 8
Flat Rock in May
Highs average 70°21° and lows 50°10°, with 3.9 in99 mm of precipitation in a typical May.
- Record high
- 98°37° (1895)
- Record low
- 19°−7° (1895)
- Heating degree days
- 212
- Cooling degree days
- 58
Flat Rock in June
Highs average 79°26° and lows 60°15°, with 4.3 in109 mm of precipitation in a typical June.
- Record high
- 103°39° (1901)
- Record low
- 29°−2° (1894)
- Heating degree days
- 40
- Cooling degree days
- 176
Flat Rock in July
Highs average 83°28° and lows 64°18°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 108°42° (1934)
- Record low
- 34°1° (1895)
- Heating degree days
- 6
- Cooling degree days
- 263
Flat Rock in August
Highs average 81°27° and lows 62°16°, with 3.5 in90 mm of precipitation in a typical August.
- Record high
- 104°40° (1916)
- Record low
- 35°2° (1951)
- Heating degree days
- 11
- Cooling degree days
- 211
Flat Rock in September
Highs average 76°24° and lows 55°13°, with 3.6 in90 mm of precipitation in a typical September.
- Record high
- 102°39° (1939)
- Record low
- 23°−5° (1896)
- Heating degree days
- 95
- Cooling degree days
- 94
Flat Rock in OctoberThis month
Highs average 63°17° and lows 43°6°, with 3.3 in85 mm of precipitation in a typical October.
- Record high
- 92°33° (1928)
- Record low
- 12°−11° (1895)
- Heating degree days
- 378
- Cooling degree days
- 15
Flat Rock in November
Highs average 50°10° and lows 34°1°, with 2.8 in72 mm of precipitation and 1.5 in3.8 cm of snow in a typical November.
- Record high
- 82°28° (1933)
- Record low
- −2°−19° (1958)
- Heating degree days
- 699
- Cooling degree days
- 0
Flat Rock in December
Highs average 39°4° and lows 25°−4°, with 2.6 in65 mm of precipitation and 7 in17 cm of snow in a typical December.
- Record high
- 73°23° (1982)
- Record low
- −17°−27° (1950)
- Heating degree days
- 1029
- Cooling degree days
- 0