Diamond Bar, CA Tornado History — 39 Tornadoes Since 1950
How many tornadoes has Diamond Bar, CA had?
Diamond Bar has had 39 tornadoes on record within 25 miles since 1950.
When was the most recent tornado near Diamond Bar?
The most recent tornado within 25 miles of Diamond Bar was an EF0 on March 13, 2025.
When is tornado season in Diamond Bar?
March is historically the peak month for tornadoes near Diamond Bar, with 11 on record. Spring through early summer (April–June) generally sees the highest activity across most of the central and southern United States.
At a Glance
Recent Tornado Activity Near Diamond Bar
The last 20 years of confirmed tornadoes within 25 miles — 5 total, averaging 0.3 per year over this window.
Tornadoes by Decade
Tornadoes by Enhanced Fujita Rating
F0–F5 ratings (pre-2007) are grouped with their EF equivalents. The Enhanced Fujita scale replaced the original Fujita scale in February 2007.
Tornadoes by Month
Have any tornadoes near Diamond Bar been fatal?
No fatalities are on record within 25 miles of Diamond Bar from any of the 39 tornadoes since 1950, though 18 injuries have been reported. NOAA Storm Prediction Center records.
Notable Tornadoes Near Diamond Bar
About Tornadoes in Diamond Bar
This overview was written July 28, 2026. The tornado counts and notable-event figures elsewhere on this page reflect the latest data and may differ from this summary.
Diamond Bar occupies the hilly eastern corner of Los Angeles County, where the San Gabriel Valley meets the Puente and Chino Hills near the Orange and San Bernardino county lines. Tornadoes in this area tend to spin up within Pacific storm systems, which is why local touchdown dates cluster in the cooler half of the year — November and December events alongside the January-through-March activity that accompanies winter and early-spring fronts.
On November 7, 1966, an F2 tornado tracked 10.3 miles on a path 50 yards wide, injuring 10 people and causing $275,000 in property damage. On November 9, 1982, another F2 cut a 10-mile swath that broadened to 1,300 yards and produced $2,750,000 in property damage; an F0 touched down in the area the same day. A pair of F1 tornadoes struck on December 7, 1992, and F1s also arrived with the cool-season storms of 1979, 1993, and 1997.
Recent decades have kept to the same rhythm. An EF1 struck on January 19, 2010, and 2023 brought a burst of activity — an EF0 on February 23, an EF1 on March 22, and an EF0 on May 4. In 2025, an EF0 touched down on March 13, another product of the late-winter storm track that has long driven tornado weather around Diamond Bar.