Cynthiana weather by month
What a typical year looks like in Cynthiana, Ohio: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Hillsboro, 23 km from Cynthiana; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 46.7 in1186 mm
- Snow a year
- 18 in46 cm
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 23
- Heating degree days
- 5,443
- Cooling degree days
- 828
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 1°−17° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Cynthiana in January
Highs average 39°4° and lows 19°−7°, with 3.4 in87 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 76°24° (1950)
- Record low
- −23°−31° (1985)
- Heating degree days
- 1113
- Cooling degree days
- 0
Cynthiana in February
Highs average 43°6° and lows 22°−6°, with 3.3 in83 mm of precipitation and 5 in13 cm of snow in a typical February.
- Record high
- 77°25° (2018)
- Record low
- −30°−34° (1899)
- Heating degree days
- 924
- Cooling degree days
- 0
Cynthiana in March
Highs average 53°11° and lows 29°−1°, with 4.2 in107 mm of precipitation and 3 in9 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −10°−23° (2015)
- Heating degree days
- 747
- Cooling degree days
- 1
Cynthiana in April
Highs average 65°18° and lows 39°4°, with 4.9 in123 mm of precipitation and 0.2 in0.5 cm of snow in a typical April.
- Record high
- 94°34° (1896)
- Record low
- 11°−12° (1923)
- Heating degree days
- 400
- Cooling degree days
- 9
Cynthiana in May
Highs average 74°23° and lows 50°10°, with 5.1 in129 mm of precipitation in a typical May.
- Record high
- 99°37° (1895)
- Record low
- 23°−5° (1966)
- Heating degree days
- 164
- Cooling degree days
- 63
Cynthiana in June
Highs average 82°28° and lows 59°15°, with 4.8 in122 mm of precipitation in a typical June.
- Record high
- 103°39° (1895)
- Record low
- 37°3° (1945)
- Heating degree days
- 24
- Cooling degree days
- 174
Cynthiana in July
Highs average 85°29° and lows 62°17°, with 4.3 in108 mm of precipitation in a typical July.
- Record high
- 105°41° (1897)
- Record low
- 41°5° (1898)
- Heating degree days
- 2
- Cooling degree days
- 256
Cynthiana in August
Highs average 83°29° and lows 60°16°, with 3.7 in94 mm of precipitation in a typical August.
- Record high
- 103°39° (1894)
- Record low
- 38°3° (1946)
- Heating degree days
- 6
- Cooling degree days
- 217
Cynthiana in September
Highs average 78°26° and lows 53°12°, with 3.2 in81 mm of precipitation in a typical September.
- Record high
- 105°41° (1895)
- Record low
- 25°−4° (1974)
- Heating degree days
- 80
- Cooling degree days
- 94
Cynthiana in OctoberThis month
Highs average 67°19° and lows 42°5°, with 3.2 in81 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 95°35° (1897)
- Record low
- 11°−12° (1952)
- Heating degree days
- 348
- Cooling degree days
- 14
Cynthiana in November
Highs average 54°12° and lows 32°0°, with 3.1 in79 mm of precipitation and 0.2 in0.5 cm of snow in a typical November.
- Record high
- 85°29° (1895)
- Record low
- −1°−18° (1929)
- Heating degree days
- 669
- Cooling degree days
- 0
Cynthiana in December
Highs average 43°6° and lows 25°−4°, with 3.6 in92 mm of precipitation and 2.2 in5.6 cm of snow in a typical December.
- Record high
- 76°24° (1982)
- Record low
- −23°−31° (1917)
- Heating degree days
- 966
- Cooling degree days
- 0