Dayton, OH Climate & Monthly Averages
The climate of Dayton
Located in Ohio, United States, Dayton experiences a humid subtropical climate with hot, humid summers and generally mild winters. Afternoon temperatures peak near 84°F (29°C) in July and dip to about 38°F (3°C) in January, with around 44.6 inches (1134 mm) of precipitation falling across the year.
Climate quick facts
- Hottest month: July - highs near 84°F (29°C)
- Coldest month: January - highs near 38°F (3°C)
- Record high: 95°F (35°C) · Record low: -17°F (-27°C) (2015–2024)
- Wettest month: May (14 rainy days) · Sunniest: July (11.8 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
- Snow: about 12 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 84°F (29°C) and overnight lows stay near 67°F (20°C). The coolest month is January, with typical highs of 38°F (3°C) and lows around 24°F (-5°C). Based on 2015–2024 weather data, temperatures have reached as high as 95°F (35°C) and dropped as low as -17°F (-27°C).
Rain, sun and snow
May is usually the wettest month. It brings about 4.6 inches (117 mm) of rain over 14 days, while September is the driest. July brings the most sunshine, averaging 11.8 hours of sun a day. Snow falls on about 12 days in a typical year, mostly from November through April.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 38° | 24° | 10 | 3.5 in | 5.2 h/day | 72% |
| February | 43° | 26° | 10 | 3.6 in | 6.5 h/day | 70% |
| March | 52° | 34° | 12 | 4.6 in | 7.4 h/day | 67% |
| April | 62° | 43° | 12 | 4.2 in | 8.8 h/day | 67% |
| May | 73° | 54° | 14 | 4.6 in | 10.1 h/day | 71% |
| June | 81° | 63° | 12 | 4.4 in | 11.6 h/day | 69% |
| July | 84° | 67° | 13 | 4.2 in | 11.8 h/day | 73% |
| August | 82° | 65° | 11 | 3.5 in | 11.2 h/day | 73% |
| September | 78° | 60° | 8 | 2.9 in | 9.9 h/day | 70% |
| October | 66° | 49° | 9 | 2.9 in | 8.2 h/day | 70% |
| November | 52° | 37° | 8 | 2.9 in | 6.4 h/day | 71% |
| December | 44° | 30° | 11 | 3.3 in | 4.9 h/day | 75% |
Dayton month by month
Dayton weather in January
January brings highs around 38°F (3°C), lows near 24°F (-5°C), about 10 wet days and roughly 4 snowy days - typically the coldest month of the year in Dayton.
Dayton weather in February
February brings highs around 43°F (6°C), lows near 26°F (-4°C), about 10 wet days and roughly 3 snowy days.
Dayton weather in March
March brings highs around 52°F (11°C), lows near 34°F (1°C), about 12 wet days and roughly 2 snowy days.
Dayton weather in April
April brings highs around 62°F (17°C), lows near 43°F (6°C), about 12 wet days.
Dayton weather in May
May brings highs around 73°F (23°C), lows near 54°F (12°C), about 14 wet days - typically the wettest month of the year in Dayton.
Dayton weather in June
June brings highs around 81°F (27°C), lows near 63°F (17°C), about 12 wet days.
Dayton weather in July
July brings highs around 84°F (29°C), lows near 67°F (20°C), about 13 wet days - typically the hottest month and the sunniest month of the year in Dayton.
Dayton weather in August
August brings highs around 82°F (28°C), lows near 65°F (18°C), about 11 wet days.
Dayton weather in September
September brings highs around 78°F (26°C), lows near 60°F (16°C), about 8 wet days - typically the driest month of the year in Dayton.
Dayton weather in October
October brings highs around 66°F (19°C), lows near 49°F (10°C), about 9 wet days.
Dayton weather in November
November brings highs around 52°F (11°C), lows near 37°F (3°C), about 8 wet days.
Dayton weather in December
December brings highs around 44°F (7°C), lows near 30°F (-1°C), about 11 wet days and roughly 1 snowy days.
Seasons in Dayton
Spring (March through May)
Spring in Dayton is crisp but comfortable, with daytime highs averaging 62°F (17°C) and nights around 44°F (6°C); expect showers on roughly 38 days across the season, plus around 2 snowy days.
Summer (June through August)
Summer in Dayton is hot, with daytime highs averaging 82°F (28°C) and nights around 65°F (18°C); expect showers on roughly 37 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
Fall (September through November)
Fall in Dayton is mild, with daytime highs averaging 66°F (19°C) and nights around 49°F (9°C); expect showers on roughly 25 days across the season.
Winter (December through February)
Winter in Dayton is chilly, with daytime highs averaging 42°F (5°C) and nights around 26°F (-3°C); expect showers on roughly 31 days across the season, plus around 8 snowy days.
Climate questions, answered
What is the average temperature in Dayton?
Is Dayton hot in summer?
Is Dayton cold in winter?
How many rainy days does Dayton get in a year?
Best time to visit Dayton
The best time to visit Dayton is generally August to October and April, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 72°F (22°C).
Pack for Dayton with a heavy insulated coat, hat and gloves for winter; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - July nights average 67°F (20°C).
Dayton temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.