London weather by month
What a typical year looks like in London, Ohio: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at LONDON STATE FISH HATCHERY, 6 km from London; records cover 1918–2026.
The year at a glance
- Precipitation a year
- 42.3 in1074 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 27
- First fall freeze
- Oct 14
- Heating degree days
- 6,041
- Cooling degree days
- 742
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −3°−19° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
London in January
Highs average 33°1° and lows 19°−7°, with 3.1 in79 mm of precipitation in a typical January.
- Record high
- 72°22° (1950)
- Record low
- −24°−31° (1994)
- Heating degree days
- 1212
- Cooling degree days
- 0
London in February
Highs average 37°3° and lows 21°−6°, with 2.3 in58 mm of precipitation in a typical February.
- Record high
- 74°23° (1922)
- Record low
- −19°−28° (1985)
- Heating degree days
- 1018
- Cooling degree days
- 0
London in March
Highs average 48°9° and lows 29°−2°, with 3.7 in94 mm of precipitation in a typical March.
- Record high
- 85°29° (2026)
- Record low
- −14°−26° (1984)
- Heating degree days
- 835
- Cooling degree days
- 1
London in April
Highs average 61°16° and lows 39°4°, with 4.1 in103 mm of precipitation in a typical April.
- Record high
- 89°32° (1942)
- Record low
- 12°−11° (1923)
- Heating degree days
- 461
- Cooling degree days
- 5
London in May
Highs average 71°22° and lows 50°10°, with 4.7 in119 mm of precipitation in a typical May.
- Record high
- 93°34° (1962)
- Record low
- 23°−5° (1966)
- Heating degree days
- 191
- Cooling degree days
- 53
London in June
Highs average 79°26° and lows 60°15°, with 4.7 in120 mm of precipitation in a typical June.
- Record high
- 102°39° (1988)
- Record low
- 35°2° (1972)
- Heating degree days
- 32
- Cooling degree days
- 165
London in July
Highs average 82°28° and lows 63°17°, with 5 in126 mm of precipitation in a typical July.
- Record high
- 109°43° (1936)
- Record low
- 42°6° (1972)
- Heating degree days
- 6
- Cooling degree days
- 236
London in August
Highs average 81°27° and lows 61°16°, with 2.9 in73 mm of precipitation in a typical August.
- Record high
- 102°39° (1936)
- Record low
- 37°3° (1965)
- Heating degree days
- 12
- Cooling degree days
- 188
London in September
Highs average 76°24° and lows 53°12°, with 2.9 in74 mm of precipitation in a typical September.
- Record high
- 102°39° (1953)
- Record low
- 28°−2° (1928)
- Heating degree days
- 106
- Cooling degree days
- 84
London in OctoberThis month
Highs average 64°18° and lows 41°5°, with 2.8 in72 mm of precipitation in a typical October.
- Record high
- 92°33° (1951)
- Record low
- 15°−9° (1925)
- Heating degree days
- 396
- Cooling degree days
- 10
London in November
Highs average 50°10° and lows 32°0°, with 3 in75 mm of precipitation in a typical November.
- Record high
- 80°27° (1950)
- Record low
- −1°−18° (1929)
- Heating degree days
- 726
- Cooling degree days
- 0
London in December
Highs average 39°4° and lows 24°−4°, with 3.2 in82 mm of precipitation in a typical December.
- Record high
- 74°23° (1982)
- Record low
- −18°−28° (1989)
- Heating degree days
- 1046
- Cooling degree days
- 0