Gutters, roofing, siding and windows in ZIP code 55920, Byron, MN

• Gutters in ZIP code 55920

  Olmsted County averages 36.7 inches of precipitation a year (NOAA 1991–2020 normals). One inch of rain on 1,000 square feet of roof is about 623 gallons of water for the gutters to carry.

• Roofing in ZIP code 55920

  10 of the 76 hail events on record within 10 miles of the center of ZIP code 55920 from 2016 through March 31, 2026 had hail 1.5 inches or larger. The National Weather Service counts hail of 1 inch or larger as severe.

• Siding in ZIP code 55920

  The strongest thunderstorm wind on record within 10 miles of the center of ZIP code 55920 from 2016 through September 22, 2025 was 81 mph. The National Weather Service counts a thunderstorm wind of 58 mph or more as severe.

• Windows in ZIP code 55920

  28% of homes in ZIP code 55920 were built before 1980. A home built before 1980 was built before the energy codes in force today were written.

Source: NOAA Storm Events Database (hail events through March 31, 2026; thunderstorm-wind and tornado events through September 22, 2025); American Community Survey 2023, 5-year; NOAA 1991–2020 climate normals.

ZIP code 55920 is filed here under Byron, in Olmsted County, Minnesota; its center is about 7 miles southwest of our Rochester office. Of the cities and towns on our pages, ZIP code 55920 covers only Byron.

Source: Census ZIP Code Tabulation Area, county and place boundaries (a ZIP code can also take in land outside any city or town).

ZIP code 55920 has 3,294 housing units, and 82% of them are single-family detached homes (American Community Survey 2023, 5-year). Another 8% are attached homes such as townhomes. Mobile homes make up 1% of the housing units.

The median home in ZIP code 55920 was built in 1996. 28% of homes in ZIP code 55920 were built before 1980, and 44% were built in 2000 or later. The most common building period is 2000–2009, with 891 homes.

84% of occupied homes in ZIP code 55920 are owner-occupied. The median owner-occupied home in ZIP code 55920 is valued at $356,900. Among occupied homes in ZIP code 55920, 63% heat with utility gas, 13% with electricity, 22% with bottled or tank gas and 1% with wood.

Source: American Community Survey 2023, 5-year (tables B25024, B25034, B25035, B25003, B25077, B25040), for ZIP Code Tabulation Area 55920.

The nearest other ZIP codes we serve, measured center to center, are 55944 in Kasson (6 miles west), 55902 in Rochester (6.1 miles southeast), 55901 in Rochester (7.4 miles northeast), 55955 in Mantorville (8 miles northwest), 55960 in Oronoco (9.9 miles northeast) and 55904 in Rochester (12 miles east). The table sets ZIP code 55920 beside the 8 ZIP codes nearest to it, using the same Census figures for each.

Source: American Community Survey 2023, 5-year, by ZIP Code Tabulation Area; distances are straight lines between ZIP code centers.

The NOAA Storm Events Database records 76 hail events, 75 thunderstorm-wind events and 1 tornado within 10 miles of the center of ZIP code 55920 from 2016 through March 31, 2026 for hail and through September 22, 2025 for thunderstorm wind and tornadoes. The largest hail on record there in that period was 2.75 inches on June 4, 2019, near Kasson. 10 of those hail events had hail 1.5 inches or larger.

The closest event to the center of ZIP code 55920 was 1.25 in hail on April 9, 2017, 1.3 miles away near Byron. The most recent hail event within 10 miles of the center of ZIP code 55920 was on August 27, 2025: 1 in hail near Stewartville. The most recent thunderstorm-wind event within 10 miles of the center of ZIP code 55920 was on July 28, 2025, near Rochester. The strongest thunderstorm wind recorded within 10 miles of the center of ZIP code 55920 in that period was 81 mph. The busiest year was 2017, with 32 events in all.

Source: NOAA Storm Events Database (hail events through March 31, 2026; thunderstorm-wind and tornado events through September 22, 2025).

Source: NOAA Storm Events Database (hail events through March 31, 2026; thunderstorm-wind and tornado events through September 22, 2025).

Source: NOAA Storm Events Database (hail events through March 31, 2026; thunderstorm-wind and tornado events through September 22, 2025).

This page is filed under Byron, which is in Olmsted County; the ratings below are that county's. Olmsted County scores 83.4 of 100 for hail in FEMA's National Risk Index, which ranks 17th of 87 Minnesota counties. Olmsted County scores 70.1 of 100 for strong wind in FEMA's National Risk Index, which ranks 38th of 87 Minnesota counties. Olmsted County scores 83.3 of 100 for winter weather in FEMA's National Risk Index, which ranks 17th of 87 Minnesota counties. Of the perils listed here, the highest score in Olmsted County is for cold wave, at 92.8 of 100.

Olmsted County averages 36.7 inches of precipitation a year (NOAA 1991–2020 normals). The average annual temperature in Olmsted County is 44.6°F.

Source: FEMA National Risk Index, 2026 release; rank among the state's counties computed from the scores; NOAA 1991–2020 climate normals.

Our Rochester office is at 3470 55th St NW, Rochester, MN 55901, about 7 miles from the center of ZIP code 55920. Its hours are Monday–Friday 7:00 AM–7:00 PM. You can reach that office at (507) 606-2707.

• Rochester office: address, hours and map