San Bernardino County Natural Disasters and Weather Extremes
The chance of earthquake damage in San Bernardino County is much higher than California average and is much higher than the national average. The risk of tornado damage in San Bernardino County is about the same as California average and is much lower than the national average.
Earthquake Index, #10
| San Bernardino County | 26.95 |
| California | 21.80 |
| U.S. | 1.81 |
The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.
Volcano Index, #23
| San Bernardino County | 0.0069 |
| California | 0.0068 |
| U.S. | 0.0023 |
The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.
Tornado Index, #7
| San Bernardino County | 18.12 |
| California | 18.56 |
| U.S. | 136.45 |
The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.
Other Weather Extremes Events
A total of 1,270 other weather extremes events within 50 miles of San Bernardino County were recorded from 1950 to 2010. The following is a break down of these events:
| Type | Count | Type | Count | Type | Count | Type | Count | Type | Count |
| Avalanche: | 0 | Blizzard: | 0 | Cold: | 3 | Dense Fog: | 4 | Drought: | 29 |
| Dust Storm: | 5 | Flood: | 402 | Hail: | 67 | Heat: | 8 | Heavy Snow: | 4 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 0 | Landslide: | 1 | Strong Wind: | 98 |
| Thunderstorm Winds: | 213 | Tropical Storm: | 0 | Wildfire: | 215 | Winter Storm: | 2 | Winter Weather: | 1 |
| Other: | 218 | ||||||||
Volcanos Nearby
A total of 5 volcanoes are found in or near San Bernardino County.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 26.2 | Lavic Lake | US-California, United States | 34.75 | -116.625 | 1495 | Volcanic field | Holocene | Undated, but probable Holocene eruption |
| 31.1 | Amboy | US-California, United States | 34.55 | -115.78 | 288 | Cinder cone | Holocene | Undated, but probable Holocene eruption |
| 122.7 | Coso Volc Field | US-California, United States | 36.03 | -117.82 | 2400 | Lava dome | Holocene | Unknown |
| 158.6 | Golden Trout Creek | US-California, United States | 36.358 | -118.32 | 2886 | Volcanic field | Tephrochronology | Last known eruption B.C. (Holocene) |
| 165.3 | Ubehebe Craters | US-California, United States | 37.02 | -117.45 | 752 | Maar | Holocene | Undated, but probable Holocene eruption |
Historical Earthquake Events
A total of 34 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near San Bernardino County.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 21.2 | 1947-04-10 | 6.4 | N/A | 34.97 | -116.53 |
| 40.1 | 1979-03-15 | 5.7 | 1 | 34.32 | -116.45 |
| 42.4 | 1943-12-22 | 5.5 | 16 | 34.33 | -115.8 |
| 20.4 | 1965-09-25 | 5.3 | N/A | 34.72 | -116.5 |
| 41.0 | 1979-03-15 | 5.3 | 1 | 34.3 | -116.43 |
| 29.5 | 1975-06-01 | 5.2 | N/A | 34.52 | -116.5 |
| 21.4 | 1965-09-26 | 5 | N/A | 34.72 | -116.52 |
| 38.4 | 1946-09-28 | 5 | N/A | 34.95 | -116.85 |
| 39.1 | 1979-03-15 | 5 | 5 | 34.33 | -116.43 |
| 41.9 | 1945-03-20 | 5 | 16 | 34.25 | -116.17 |
| 44.1 | 1947-05-11 | 4.9 | N/A | 34.23 | -116.33 |
| 47.3 | 1973-07-14 | 4.8 | 8 | 34.4 | -116.8 |
| 40.0 | 1975-12-14 | 4.7 | N/A | 34.29 | -116.32 |
| 22.8 | 1976-08-01 | 4.5 | 12 | 34.9 | -116.58 |
| 36.4 | 1985-07-18 | 4.5 | 6 | 34.42 | -116.54 |
| 38.2 | 1979-03-15 | 4.5 | 1 | 34.35 | -116.45 |
| 40.3 | 1978-03-01 | 4.4 | 5 | 34.53 | -116.77 |
| 42.5 | 1964-01-06 | 4.4 | N/A | 34.3 | -116.5 |
| 44.0 | 1948-12-18 | 4.4 | N/A | 34.95 | -116.95 |
| 37.6 | 1979-03-18 | 4.2 | 5 | 34.33 | -116.35 |
| 42.9 | 1979-07-13 | 4 | 5 | 34.27 | -116.43 |
| 47.4 | 1947-08-01 | 4 | N/A | 35 | -117 |
| 48.5 | 1932-02-11 | 4 | 16 | 34.42 | -116.85 |
| 41.0 | 1979-03-15 | 3.9 | 1 | 34.3 | -116.43 |
| 48.2 | 1976-05-10 | 3.8 | 8 | 34.46 | -116.88 |
| 48.6 | 1978-04-29 | 3.8 | 6 | 34.23 | -116.57 |
| 28.3 | 1969-06-10 | 3.7 | N/A | 35.08 | -116.6 |
| 41.0 | 1979-03-16 | 3.7 | 2 | 34.3 | -116.43 |
| 45.5 | 1970-05-16 | 3.7 | 8 | 34.37 | -116.72 |
| 46.9 | 1978-04-14 | 3.7 | 5 | 35.28 | -116.83 |
| 39.7 | 1979-03-16 | 3.5 | 2 | 34.32 | -116.43 |
| 40.4 | 1964-01-06 | 3.5 | N/A | 34.3 | -116.4 |
| 41.3 | 1984-07-27 | 3.5 | 6 | 34.26 | -116.15 |
| 46.5 | 1936-04-03 | 3.5 | 16 | 34.9 | -117 |
Historical Tornado Events
A total of 1 historical tornado event that had recorded magnitude of 2 or above found in or near San Bernardino County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 44.3 | 1982-09-07 | 2 | 34°14'N / 116°22'W | 0.50 Mile | 20 Yards | 0 | 2 | 25K | 0 | San Bernardino |
* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.