St. Johns weather by month
What a typical year looks like in St. Johns, Ohio: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at LIMA WWTP, 19 km from St. Johns; records cover 1901–2026.
The year at a glance
- Precipitation a year
- 41.2 in1045 mm
- Snow a year
- 19 in47 cm
- Last spring freeze
- Apr 25
- First fall freeze
- Oct 22
- Heating degree days
- 5,926
- Cooling degree days
- 850
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −1°−18° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
St. Johns in January
Highs average 34°1° and lows 19°−7°, with 2.8 in72 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 77°25° (1906)
- Record low
- −21°−29° (1985)
- Heating degree days
- 1206
- Cooling degree days
- 0
St. Johns in February
Highs average 37°3° and lows 21°−6°, with 2.5 in64 mm of precipitation and 5 in13 cm of snow in a typical February.
- Record high
- 72°22° (2000)
- Record low
- −16°−27° (1905)
- Heating degree days
- 1011
- Cooling degree days
- 0
St. Johns in March
Highs average 48°9° and lows 29°−2°, with 3 in77 mm of precipitation and 2.8 in7.1 cm of snow in a typical March.
- Record high
- 86°30° (2012)
- Record low
- −8°−22° (1948)
- Heating degree days
- 835
- Cooling degree days
- 1
St. Johns in April
Highs average 61°16° and lows 39°4°, with 4 in101 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 89°32° (1925)
- Record low
- 8°−13° (1923)
- Heating degree days
- 463
- Cooling degree days
- 7
St. Johns in May
Highs average 72°22° and lows 50°10°, with 4.4 in111 mm of precipitation in a typical May.
- Record high
- 95°35° (1911)
- Record low
- 24°−4° (1966)
- Heating degree days
- 189
- Cooling degree days
- 58
St. Johns in June
Highs average 80°27° and lows 60°15°, with 4.3 in109 mm of precipitation in a typical June.
- Record high
- 103°39° (2012)
- Record low
- 34°1° (1966)
- Heating degree days
- 28
- Cooling degree days
- 181
St. Johns in July
Highs average 84°29° and lows 63°17°, with 4.4 in111 mm of precipitation in a typical July.
- Record high
- 109°43° (1936)
- Record low
- 43°6° (1940)
- Heating degree days
- 3
- Cooling degree days
- 264
St. Johns in August
Highs average 82°28° and lows 62°17°, with 3.8 in97 mm of precipitation in a typical August.
- Record high
- 103°39° (1934)
- Record low
- 36°2° (1965)
- Heating degree days
- 7
- Cooling degree days
- 221
St. Johns in September
Highs average 77°25° and lows 55°13°, with 3.2 in81 mm of precipitation in a typical September.
- Record high
- 101°38° (1939)
- Record low
- 27°−3° (1940)
- Heating degree days
- 82
- Cooling degree days
- 102
St. Johns in OctoberThis month
Highs average 64°18° and lows 44°7°, with 2.9 in74 mm of precipitation in a typical October.
- Record high
- 94°34° (1971)
- Record low
- 17°−8° (1925)
- Heating degree days
- 360
- Cooling degree days
- 16
St. Johns in November
Highs average 50°10° and lows 33°1°, with 3.1 in80 mm of precipitation and 0.4 in1 cm of snow in a typical November.
- Record high
- 80°27° (1950)
- Record low
- −3°−19° (1958)
- Heating degree days
- 704
- Cooling degree days
- 0
St. Johns in December
Highs average 39°4° and lows 25°−4°, with 2.7 in69 mm of precipitation and 4 in10 cm of snow in a typical December.
- Record high
- 70°21° (1982)
- Record low
- −17°−27° (1983)
- Heating degree days
- 1038
- Cooling degree days
- 0