NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Louisville, CO
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 Louisville, Colorado since records began in 1851. Since 1950, 147 tornadoes have touched down within 25 miles, 3 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 147
- 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 Louisville
The highest rating among the 147 tornadoes within 25 miles is F3 or EF3, reached 3 times; the most recent, on June 4, 2015, came within 20 miles. Of the 147, 4 had paths within 5 miles of the city centre, and 31 have come since 2000. June has had the most tornadoes, 72. The most recent tornado was on June 13, 2025. Louisville has more tornadoes within 25 miles than 68% of the 157 Colorado cities on this site. Hail has been reported within 10 miles 369 times since 1961, with stones up to 3 inches (tea cup size). Louisville has more hail reports within 10 miles than 84% of the 157 Colorado cities.
Compare Louisville's storm record with another city →
Tornadoes within 25 miles of Louisville
By decade
- 2020s5
- 2010s10(1 EF3+)
- 2000s16
- 1990s43
- 1980s45(1 EF3+)
- 1970s12(1 EF3+)
- 1960s10
- 1950s6
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Jun 4, 2015 | EF3 | 20 mi | 6.71 mi | 0 / 0 |
| Jun 15, 1988 | F3 | 20 mi | 2.5 mi | 0 / 7 |
| May 18, 1975 | F3 | 25 mi | 4.1 mi | 0 / 0 |
| Jun 7, 2021 | EF2 | 18 mi | 7.5 mi | 0 / 0 |
| Jun 15, 1988 | F2 | 20 mi | 0.5 mi | 0 / 0 |
| Jun 5, 1988 | F2 | 4 mi | 0.5 mi | 0 / 0 |
| Jun 5, 1988 | F2 | 10 mi | 2 mi | 0 / 0 |
| Jul 2, 1987 | F2 | 23 mi | 1 mi | 0 / 0 |
| Jun 8, 1986 | F2 | 21 mi | 1.1 mi | 0 / 6 |
| Jun 3, 1981 | F2 | 11 mi | 2.3 mi | 0 / 42 |
| Jun 3, 1981 | F2 | 18 mi | 0.1 mi | 0 / 0 |
| Oct 15, 1980 | F2 | 5 mi | 1.5 mi | 0 / 0 |
The strongest 12 of 147, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Louisville
The Storm Prediction Center has 369 hail reports within 10 miles of Louisville since 1961, made on 141 separate days. Of these, 244 were 1 inch across or larger, and 20 reached 2 inches. The largest, 3 inches (tea cup size), fell on June 18, 2018. The most recent report is from August 10, 2025. June has the most reports, 120.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Louisville
The nearest NOAA station with 1991–2020 climate normals is Boulder, CO, 7 miles west of Louisville at 5,484 feet. July is the warmest, with an average high of 88°F and low of 57°F; December is the coolest, at 46°F and 21°F. May is the wettest at 3.2 inches of precipitation on average and January and December the driest at 0.8 inches; the year adds up to 21.3 inches over 49 days with at least a tenth of an inch. Highs reach 90°F on about 33 days a year, almost all from June to September. Lows fall below freezing on about 138 nights a year. Snowfall averages 92.8 inches a year, most of it in March. That 21.3 inches is more than at 79 of the 91 Colorado stations used on this site (87%). Lafayette, 4 miles northeast, has its own station (Northglenn, CO): 14.5 inches a year, 6.8 less than here, and a July average high of 91°F against 88°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 47 | 22 | 0.8 | 3 | 11.3 |
| Feb | 48 | 22 | 1.0 | 4 | 15.0 |
| Mar | 57 | 29 | 2.0 | 4 | 15.7 |
| Apr | 63 | 35 | 3.1 | 6 | 14.7 |
| May | 71 | 43 | 3.2 | 7 | 2.0 |
| Jun | 83 | 51 | 2.0 | 5 | 0.0 |
| Jul | 88 | 57 | 1.8 | 4 | 0.0 |
| Aug | 86 | 56 | 1.7 | 4 | 0.0 |
| Sep | 79 | 48 | 2.1 | 4 | 1.0 |
| Oct | 66 | 37 | 1.6 | 4 | 7.0 |
| Nov | 55 | 28 | 1.2 | 3 | 13.1 |
| Dec | 46 | 21 | 0.8 | 3 | 13.0 |
| Year | 66 | 37 | 21.3 | 49 | 92.8 |
Averages for 1991–2020 at Boulder, CO (5,484 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 Louisville
Since 1996, the National Weather Service has logged 75 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Louisville: 53 thunderstorm wind reports, 9 flash floods, 8 lightning strikes, 4 floods and 1 heavy rain event. They killed 2 people and injured 11, and the NWS estimated $298.2 million in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on July 12, 1996. September has had the most flash floods, 6 of 9. Of the 144 Colorado cities on this site with a flash flood on record, 86 have had fewer than Louisville.
July 14, 2019: lightning strike 8 miles from the centre of Louisville — 1 killed, 1 injured.
September 11, 2013: flash flood 10 miles from the centre of Louisville — 1 killed.
August 10, 1996: thunderstorm wind 8 miles from the centre of Louisville — 5 injured.
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
Flood insurance policyholders in Louisville's ZIP code 80027 have filed 10 claims with the National Flood Insurance Program since 2013, and were paid $229,000 for buildings and contents, in the dollars of each year. The most came from Late summer storms in 2013: 10 claims (100% of all) and $229,000. Of the 56 Colorado cities on this site with 10 or more claims, 0 have fewer than Louisville.
| Event | Claims | Paid |
|---|---|---|
| Late summer storms2013 | 10 | $229,000 |
Boulder County, which includes Louisville, has been named in 19 federal disaster or emergency declarations since 1969, 7 of them major disasters (by incident: 9 fires, 5 floods, 2 biological emergencies, 2 snowstorms). The latest major disaster declaration was Wildfires and Straight-Line Winds, on December 31, 2021. FEMA's National Risk Index gives Boulder County a Relatively Moderate rating for natural hazard risk overall; by hazard: Very High for lightning; Relatively High for tornadoes, hail and strong wind; Relatively Moderate for inland flooding; Relatively Low for heat waves. It models the county's expected loss from all 18 hazards it covers at $125.3 million a year, the 7th highest of 64 Colorado counties; of the hazards above, the largest share, $69.1 million (55%), 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.