NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Johnstown, 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 Johnstown, Colorado since records began in 1851. Since 1950, 168 tornadoes have touched down within 25 miles, 3 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 168
- EF3 or stronger
- 3
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
1 deaths in all
What the records show for Johnstown
The highest rating among the 168 tornadoes within 25 miles is F3 or EF3, reached 3 times; the most recent, on June 4, 2015, came within 11 miles. The deadliest, an EF3 on May 22, 2008, killed 1 person. Of the 168, 8 had paths within 5 miles of the city centre, and 48 have come since 2000. June has had the most tornadoes, 61. The most recent tornado was on June 20, 2024. Johnstown has more tornadoes within 25 miles than 76% of the 157 Colorado cities on this site. Hail has been reported within 10 miles 161 times since 1955, with stones up to 2.75 inches (baseball size). Johnstown has more hail reports within 10 miles than 61% of the 157 Colorado cities.
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Tornadoes within 25 miles of Johnstown
By decade
- 2020s9
- 2010s13(1 EF3+)
- 2000s26(1 EF3+)
- 1990s40
- 1980s38
- 1970s19
- 1960s7
- 1950s16(1 EF3+)
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| May 22, 2008 | EF3 | 4 mi | 38.69 mi | 1 / 78 |
| Jun 4, 2015 | EF3 | 11 mi | 6.71 mi | 0 / 0 |
| May 15, 1952 | F3 | 18 mi | 7.4 mi | 0 / 5 |
| Jun 7, 2021 | EF2 | 7 mi | 7.5 mi | 0 / 0 |
| Jul 31, 1996 | F2 | 22 mi | 5 mi | 0 / 0 |
| Jun 5, 1988 | F2 | 21 mi | 2 mi | 0 / 0 |
| Jul 7, 1987 | F2 | 25 mi | 5 mi | 0 / 0 |
| May 18, 1984 | F2 | 21 mi | 5 mi | 0 / 0 |
| May 18, 1984 | F2 | 23 mi | 5 mi | 0 / 0 |
| May 18, 1984 | F2 | 19 mi | 5 mi | 0 / 0 |
| Jun 25, 1982 | F2 | 15 mi | 1 mi | 0 / 0 |
| Jun 4, 1976 | F2 | 19 mi | 0.5 mi | 0 / 0 |
The strongest 12 of 168, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Johnstown
The Storm Prediction Center has 161 hail reports within 10 miles of Johnstown since 1955, made on 97 separate days. Of these, 113 were 1 inch across or larger, and 7 reached 2 inches. The largest size, 2.75 inches (baseball size), was reported on 2 days, most recently June 17, 2025. The most recent report is from July 24, 2025. June has the most reports, 60.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Johnstown
The nearest NOAA station with 1991–2020 climate normals is Loveland 2N, CO, 11 miles northwest of Johnstown at 5,080 feet. July is the warmest, with an average high of 89°F and low of 55°F; January is the coolest, at 44°F and 13°F. May is the wettest at 2.7 inches of precipitation on average and January the driest at 0.5 inches; the year adds up to 15.7 inches over 38 days with at least a tenth of an inch. Highs reach 90°F on about 38 days a year, almost all from June to September. Lows fall below freezing on about 174 nights a year. Snowfall averages 47.0 inches a year, most of it in February. That 15.7 inches is more than at 48 of the 91 Colorado stations used on this site (53%). Milliken, 3 miles east, has its own station (Greeley Unc, CO): 14.9 inches a year, 0.8 less than here, and a July average high of 92°F against 89°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 44 | 13 | 0.5 | 2 | 6.0 |
| Feb | 46 | 15 | 0.6 | 2 | 8.2 |
| Mar | 56 | 23 | 1.3 | 3 | 7.9 |
| Apr | 62 | 31 | 2.2 | 5 | 5.7 |
| May | 71 | 40 | 2.7 | 6 | 1.1 |
| Jun | 83 | 49 | 1.6 | 4 | 0.0 |
| Jul | 89 | 55 | 1.5 | 4 | 0.0 |
| Aug | 87 | 53 | 1.3 | 3 | 0.0 |
| Sep | 79 | 44 | 1.4 | 3 | 0.0 |
| Oct | 65 | 32 | 1.2 | 3 | 3.5 |
| Nov | 53 | 21 | 0.8 | 2 | 7.0 |
| Dec | 44 | 13 | 0.6 | 2 | 7.6 |
| Year | 65 | 32 | 15.7 | 38 | 47.0 |
Averages for 1991–2020 at Loveland 2N, CO (5,080 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 Johnstown
Since 1996, the National Weather Service has logged 43 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Johnstown: 28 thunderstorm wind reports, 10 flash floods, 3 floods and 2 lightning strikes. They killed 4 people and injured 6, and the NWS estimated $776,000 in property and crop damage. The strongest thunderstorm gust on record here was 70 mph, on August 28, 2001. September has had the most flash floods, 5 of 10. Of the 144 Colorado cities on this site with a flash flood on record, 94 have had fewer than Johnstown.
July 2, 2005: thunderstorm wind 9 miles from the centre of Johnstown — 2 killed, 4 injured.
September 12, 2013: flash flood 9 miles from the centre of Johnstown — 2 killed.
August 28, 2001: thunderstorm wind 9 miles from the centre of Johnstown — 2 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
Weld County, which includes Johnstown, has been named in 16 federal disaster or emergency declarations since 1965, 12 of them major disasters (by incident: 6 floods, 3 severe storms, 2 biological emergencies, 1 coastal storm). The latest major disaster declaration was Covid-19 Pandemic, on March 28, 2020. FEMA's National Risk Index gives Weld County a Relatively Moderate rating for natural hazard risk overall; by hazard: Relatively High for tornadoes, hail, strong wind and lightning; Relatively Moderate for inland flooding; Relatively Low for heat waves. It models the county's expected loss from all 18 hazards it covers at $104.7 million a year, the 9th highest of 64 Colorado counties; of the hazards above, the largest share, $44.5 million (42%), 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.
Cities near Johnstown
- Milliken, CO3 mi
- Mead, CO8 mi
- Platteville, CO8 mi
- Berthoud, CO9 mi
- Windsor, CO10 mi
- Loveland, CO11 mi
- Greeley, CO11 mi
- Evans, CO12 mi
- La Salle, CO12 mi
- Timnath, CO14 mi
- Longmont, CO15 mi
- Frederick, CO16 mi
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