| Cooling degree days per year | 3,912 (Annual cooling degree days (base 65°F), a measure of how much air conditioning a climate needs; NOAA station St. Petersburg Airport (USW00092806), about 1 mile from the city center point.) | 1991–2020 normals | NOAA NCEI, U.S. Climate Normals 1991–2020 |
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| Days a year at 90°F or hotter | 71 (Average number of days per year with a high of 90°F or more; NOAA station St. Petersburg Airport (USW00092806), about 1 mile from the city center point.) | 1991–2020 normals | NOAA NCEI, U.S. Climate Normals 1991–2020 |
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| Median home value | $371,100 (Median value of owner-occupied homes (ACS table B25077).) | 2020–2024 | U.S. Census Bureau, American Community Survey 5-year estimates |
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| Homes built before 1990 | 80.0% (113,181 of 141,508 housing units were built in 1989 or earlier (ACS table B25034, year structure built).) | 2020–2024 | U.S. Census Bureau, American Community Survey 5-year estimates |
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| Households in St. Petersburg | 119,244 (Occupied housing units (one household per occupied home), ACS table B25003.) | 2020–2024 | U.S. Census Bureau, American Community Survey 5-year estimates |
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| Atlantic hurricane season | June 1 to November 30 (An average season (1991–2020) has 14 named storms, 7 hurricanes and 3 major hurricanes.) | 1991–2020 climate period | NOAA National Hurricane Center, Tropical Cyclone Climatology |
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| Florida air-conditioning contractor classes | Class A or Class B (Class A has no size limit; Class B covers systems up to 25 tons of cooling and 500,000 Btu of heating.) | 2026 Florida Statutes | Florida Statutes s. 489.105 (definitions) |
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| Check an HVAC contractor's license | Florida DBPR license search (Search by name or license number for certified (CAC) and registered (RA) air-conditioning contractors and their status.) | live lookup | Florida Department of Business and Professional Regulation |
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| State license for HVAC contracting | Required: state-certified or registered contractor (A person must be certified or registered to engage in the business of contracting in Florida (s. 489.113(2), F.S.). Air-conditioning and mechanical contractors are licensed by the DBPR Construction Industry Licensing Board; check a contractor's license status at myfloridalicense.com.) | 2026 Florida Statutes | Florida Statutes s. 489.113; Florida DBPR license search |
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| Median year homes were built | 1969 (Half of all housing units were built before this year (ACS table B25035).) | 2020–2024 | U.S. Census Bureau, American Community Survey 5-year estimates |
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| Owner-occupied homes | 62.8% (74,915 of 119,244 occupied homes are lived in by their owners (ACS table B25003).) | 2020–2024 | U.S. Census Bureau, American Community Survey 5-year estimates |
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| St. Petersburg residents | 264,033 (Population estimate for July 1, 2025 (incorporated place).) | July 1, 2025 | U.S. Census Bureau, Vintage 2025 population estimates |
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| Average summer high | 89.4°F (Normal daily maximum temperature for June to August; NOAA station St. Petersburg Airport (USW00092806), about 1 mile from the city center point.) | 1991–2020 normals | NOAA NCEI, U.S. Climate Normals 1991–2020 |