Dayton Weather and Home Age: Exterior Cleaning Facts
Dayton's weather limits when exterior cleaning works well, and its housing is older than most of the Cincinnati suburbs. Here are the official numbers.
Data: NOAA 1991-2020 climate normals, Dayton International Airport; ACS 2019-2023 5-year estimates. Checked October 2026.
Key numbers
| Month | Precipitation (in) | Average temperature (F) |
|---|---|---|
| January | 3.08 | 29.4 |
| February | 2.35 | 32.8 |
| March | 3.50 | 42.1 |
| April | 4.46 | 53.7 |
| May | 4.51 | 64.0 |
| June | 4.14 | 72.7 |
| July | 3.95 | 76.0 |
| August | 2.96 | 74.5 |
| September | 3.31 | 67.7 |
| October | 2.95 | 56.0 |
| November | 3.07 | 44.1 |
| December | 3.05 | 34.3 |
Freezing days limit the calendar
Dayton averages nearly 110 days a year with a low at or below freezing, which is more than the Cincinnati airport's 100 days. Average temperatures from December through February sit in the 30s or lower. That is why exterior glass cleaning concentrates in spring and fall, and winter is better for interior work.
Average temperatures reach the low 40s in March and November, which is where exterior work becomes practical again in spring and starts to wind down in fall.
Rain, gutters and algae
Dayton gets about 41 inches of precipitation a year, with the wettest months running from April through July. About nine days a year bring an inch or more, when overflowing gutters are most likely to stain siding and soak foundations. Clearing gutters before the spring rains and again after leaf fall is the practical response.
Wet springs and shade encourage algae and mildew on north-facing siding and decks, which is why spring is a common time for soft washing.
An older housing stock
In the city of Dayton the median home was built in 1951, and 85.8% of homes were built before 1980, based on Census estimates. Only 48.2% of occupied homes are owner-occupied, and the median home value is $93,200. Older homes call for lead-safe wet methods around painted window frames and gentler washing on older materials.
The takeaway
Plan exterior cleaning for spring and fall, clear gutters around the wet months, and treat Dayton's older homes with extra care.
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020, station USW00093815
- U.S. Census Bureau, American Community Survey 5-year estimates (2019-2023), tables B25035, B25034, B25003 and B25077 via data.census.gov
- U.S. Environmental Protection Agency, lead in older homes
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