NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Byron, MN
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
No tropical storm or hurricane has passed within 75 miles of Byron, Minnesota since records began in 1851. Since 1950, 101 tornadoes have touched down within 25 miles, 3 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 101
- EF3 or stronger
- 3
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
no recorded deaths
What the records show for Byron
The strongest of the 101 tornadoes within 25 miles was an F4 on September 16, 1962; its path came within 10 miles. Of the 101, 4 had paths within 5 miles of the city centre, and 32 have come since 2000. June has had the most tornadoes, 37. The most recent tornado was on August 29, 2025. Byron has more tornadoes within 25 miles than 69% of the 341 Minnesota cities on this site. Hail has been reported within 10 miles 227 times since 1962, with stones up to 2.75 inches (baseball size). Byron has more hail reports within 10 miles than 86% of the 341 Minnesota cities.
Compare Byron's storm record with another city →
Tornadoes within 25 miles of Byron
By decade
- 2020s11
- 2010s16(1 EF3+)
- 2000s5
- 1990s20
- 1980s13(1 EF3+)
- 1970s12
- 1960s21(1 EF3+)
- 1950s3
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Sep 16, 1962 | F4 | 10 mi | 0.5 mi | 0 / 34 |
| Jun 17, 2010 | EF3 | 23 mi | 4.32 mi | 0 / 0 |
| May 17, 1982 | F3 | 24 mi | 46 mi | 0 / 0 |
| Jun 17, 2010 | EF2 | 18 mi | 6.61 mi | 0 / 1 |
| May 17, 1982 | F2 | 2 mi | 4 mi | 0 / 0 |
| Apr 29, 1981 | F2 | 12 mi | 0.1 mi | 0 / 2 |
| Jul 3, 1979 | F2 | 13 mi | 0.5 mi | 0 / 0 |
| Apr 30, 1967 | F2 | 16 mi | 6.8 mi | 0 / 0 |
| May 5, 1965 | F2 | 21 mi | 23.6 mi | 0 / 0 |
| Aug 28, 1964 | F2 | 23 mi | 2.7 mi | 0 / 0 |
| Apr 13, 1964 | F2 | 9 mi | 3.4 mi | 0 / 0 |
| Sep 16, 1962 | F2 | 16 mi | 3 mi | 0 / 0 |
The strongest 12 of 101, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Byron
The Storm Prediction Center has 227 hail reports within 10 miles of Byron since 1962, made on 105 separate days. Of these, 128 were 1 inch across or larger, and 10 reached 2 inches. The largest size, 2.75 inches (baseball size), was reported on 3 days, most recently June 4, 2019. The most recent report is from August 27, 2025. May has the most reports, 73.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Byron
The nearest NOAA station with 1991–2020 climate normals is Byron 4north, MN, 5 miles north of Byron at 1,041 feet. July is the warmest, with an average high of 81°F and low of 58°F; January is the coolest, at 23°F and 4°F. June is the wettest at 5.3 inches of precipitation on average and January the driest at 1.0 inches; the year adds up to 35.9 inches over 63 days with at least a tenth of an inch. Highs reach 90°F on about 8 days a year, almost all from June to August. Lows fall below freezing on about 176 nights a year. Snowfall averages 44.4 inches a year, most of it in December. That 35.9 inches is more than at 116 of the 124 Minnesota stations used on this site (94%). Rochester, 8 miles east, has its own station (Rochester International Airport, MN): 34.7 inches a year, 1.2 less than here, and a July average high of 80°F against 81°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 23 | 4 | 1.0 | 3 | 8.8 |
| Feb | 27 | 6 | 1.1 | 2 | 9.6 |
| Mar | 40 | 20 | 2.1 | 5 | 8.8 |
| Apr | 55 | 32 | 3.6 | 6 | 1.2 |
| May | 68 | 44 | 4.3 | 8 | 0.6 |
| Jun | 78 | 55 | 5.3 | 8 | 0.0 |
| Jul | 81 | 58 | 4.6 | 7 | 0.0 |
| Aug | 79 | 55 | 4.8 | 6 | 0.0 |
| Sep | 72 | 47 | 3.5 | 6 | 0.0 |
| Oct | 58 | 34 | 2.4 | 5 | 0.1 |
| Nov | 42 | 23 | 1.9 | 3 | 2.8 |
| Dec | 28 | 11 | 1.3 | 3 | 12.5 |
| Year | 54 | 32 | 35.9 | 63 | 44.4 |
Averages for 1991–2020 at Byron 4north, MN (1,041 ft), from NOAA NCEI U.S. Climate Normals. Normals describe the station; the farther a place is from it, and the bigger the difference in height, the more its weather can differ.
Floods, thunderstorm wind and lightning near Byron
Since 1996, the National Weather Service has logged 195 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Byron: 126 thunderstorm wind reports, 31 heavy rain events, 20 floods, 12 lightning strikes and 6 flash floods. None is recorded as killing or injuring anyone; the NWS estimated $40.4 million in property and crop damage. The strongest thunderstorm gust on record here was 92 mph, on May 19, 1996. August has had the most flash floods, 3 of 6. Of the 312 Minnesota cities on this site with a flash flood on record, 168 have had fewer than Byron.
August 18, 2007: flash flood 8 miles from the centre of Byron — $35.1 million damage.
May 19, 1996: thunderstorm wind in Byron — $900,000 damage.
March 19, 2012: thunderstorm wind 2 miles from the centre of Byron — $800,000 damage.
NWS: “Winds ripped the lids off four 50,000 bushel galvanized steel bins and pushed them over. An empty 30,000 gallon fuel tank was also toppled.”
Source: NOAA NCEI Storm Events Database, events whose starting point is on record, 1996 to June 30, 2026. Damage is the NWS estimate in the dollars of the year, not insured losses, and NWS notes that some reports are unverified.
Flood insurance claims, disaster declarations and FEMA risk ratings
Olmsted County, which includes Byron, has been named in 15 federal disaster or emergency declarations since 1965, 12 of them major disasters (by incident: 4 floods, 4 severe storms, 2 biological emergencies, 2 tornadoes). The latest major disaster declaration was Covid-19 Pandemic, on April 7, 2020. FEMA's National Risk Index gives Olmsted County a Relatively Moderate rating for natural hazard risk overall; by hazard: Relatively Moderate for tornadoes, hail, inland flooding and strong wind; Relatively Low for lightning and heat waves. It models the county's expected loss from all 18 hazards it covers at $93.6 million a year, the 6th highest of 87 Minnesota counties; of the hazards above, the largest share, $55.8 million (60%), is from inland flooding.
Claims: FEMA, OpenFEMA Dataset FIMA NFIP Redacted Claims – v3, summed over ZIP codes; payments in the dollars of each year, not adjusted for inflation. Declarations: Disaster Declarations Summaries – v2, by county. Retrieved October 25, 2026. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Risk ratings: FEMA, National Risk Index county table, December 2025 (v1.20), retrieved October 26, 2026; ratings compare counties nationwide, are meant for planning and are no substitute for a local risk assessment. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
What counts as a pass, the distances and the sources: how this storm history is built.