NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit San Dimas, CA
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 San Dimas, California since records began in 1851. Since 1950, 28 tornadoes have touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 28
- EF3 or stronger
- 0
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
no recorded deaths
What the records show for San Dimas
The highest rating among the 28 tornadoes within 25 miles is F2, reached 2 times; the most recent, on November 9, 1982, came within 20 miles. Of the 28, 4 had paths within 5 miles of the city centre, and 8 have come since 2000. March has had the most tornadoes, 9. The most recent tornado was on March 13, 2025. San Dimas has more tornadoes within 25 miles than 79% of the 705 California cities on this site. Hail has been reported within 10 miles 3 times since 2008, with stones up to 1.5 inches (ping pong ball size). Of the 705 California cities, 44% have more hail reports within 10 miles than San Dimas.
Compare San Dimas's storm record with another city →
Tornadoes within 25 miles of San Dimas
By decade
- 2020s3
- 2000s5
- 1990s7
- 1980s6
- 1970s4
- 1960s2
- 1950s1
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Nov 9, 1982 | F2 | 20 mi | 10 mi | 0 / 0 |
| Nov 7, 1966 | F2 | 25 mi | 10.3 mi | 0 / 10 |
| Mar 22, 2023 | EF1 | 19 mi | 0.47 mi | 0 / 1 |
| Jan 14, 1993 | F1 | 17 mi | 1 mi | 0 / 0 |
| Dec 7, 1992 | F1 | 20 mi | 0.1 mi | 0 / 0 |
| Mar 20, 1992 | F1 | 21 mi | 0.2 mi | 0 / 0 |
| Mar 16, 1986 | F1 | 20 mi | 1.2 mi | 0 / 0 |
| Mar 29, 1982 | F1 | 16 mi | 2 mi | 0 / 0 |
| Jan 31, 1979 | F1 | 25 mi | 2 mi | 0 / 0 |
| Mar 16, 1977 | F1 | 15 mi | 10.9 mi | 0 / 4 |
| Nov 25, 1965 | F1 | 3 mi | 2 mi | 0 / 0 |
| Mar 13, 2025 | EF0 | 16 mi | 0.97 mi | 0 / 0 |
The strongest 12 of 28, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in San Dimas
The Storm Prediction Center has 3 hail reports within 10 miles of San Dimas since 2008. All were 1 inch across or larger, and none reached 2 inches. The largest, 1.5 inches (ping pong ball size), fell on March 1, 2014. The most recent report is from March 24, 2024.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in San Dimas
The nearest NOAA station with 1991–2020 climate normals is Pomona/Fairplex, CA, 3 miles southeast of San Dimas at 999 feet. August is the warmest, with an average high of 92°F and low of 63°F; December is the coolest, at 67°F and 42°F. Highs reach 90°F on about 71 days a year, almost all from April to October. Lows fall below freezing on about 3 nights a year. That 14.5 inches is more than at 98 of the 226 California stations used on this site (43%). Baldwin Park, 9 miles west, has its own station (San Gabriel Fire Dept, CA): 15.5 inches a year, 1.0 more than here, and an August average high of 88°F against 92°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" |
|---|---|---|---|---|
| Jan | 68 | 43 | 2.9 | 4 |
| Feb | 67 | 45 | 4.2 | 5 |
| Mar | 72 | 47 | 2.1 | 3 |
| Apr | 76 | 50 | 1.0 | 1 |
| May | 78 | 54 | 0.2 | 0 |
| Jun | 84 | 57 | 0.1 | 0 |
| Jul | 90 | 62 | 0.0 | 0 |
| Aug | 92 | 63 | 0.0 | 0 |
| Sep | 89 | 60 | 0.0 | 0 |
| Oct | 81 | 54 | 1.0 | 2 |
| Nov | 74 | 47 | 0.7 | 1 |
| Dec | 67 | 42 | 2.3 | 4 |
| Year | 78 | 52 | 14.5 | 21 |
Averages for 1991–2020 at Pomona/Fairplex, CA (999 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 San Dimas
Since 1996, the National Weather Service has logged 42 flood, rain, thunderstorm wind and lightning events that began within 10 miles of San Dimas: 25 flash floods, 9 thunderstorm wind reports, 5 heavy rain events and 3 floods. None is recorded as killing or injuring anyone; the NWS estimated $31,000 in property and crop damage. The strongest thunderstorm gust on record here was 100 mph, on April 18, 2000. February has had the most flash floods, 6 of 25. Of the 550 California cities on this site with a flash flood on record, 484 have had fewer than San Dimas.
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
Los Angeles County, which includes San Dimas, has been named in 88 federal disaster or emergency declarations since 1969, 35 of them major disasters (by incident: 61 fires, 10 floods, 8 severe storms, 3 earthquakes). The latest major disaster declaration was Wildfires and Straight-Line Winds, on January 8, 2025. FEMA's National Risk Index gives Los Angeles County a Very High rating for natural hazard risk overall; by hazard: Very High for inland flooding and lightning; Relatively High for tornadoes, coastal flooding and heat waves; Relatively Moderate for hail and strong wind. It models the county's expected loss from all 18 hazards it covers at $7.60 billion a year, the highest of 58 California counties; of the hazards above, the largest share, $2.81 billion (37%), 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.