Lightning Risk in California

All California counties ranked by FEMA National Risk Index lightning score

Lightning risk — electrical discharges from storms that ignite fires and cause casualties — is rated for 58 of 58 California counties in FEMA's National Risk Index. Los Angeles County carries the state's highest lightning score at 96.9, with $2M in expected annual lightning losses.

10 California counties are rated High or Very High for lightning, and expected annual losses from lightning total roughly $26M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Lightning

#CountyLightning ScoreRatingAnn. Freq.Ann. Loss
1 Los Angeles County
96.9
Very High 8.36 / yr $2M
2 San Bernardino County
95.2
High 16.79 / yr $2M
3 Tulare County
94.9
High 15.72 / yr $2M
4 San Joaquin County
93.4
High 7.70 / yr $2M
5 Stanislaus County
91.0
High 6.95 / yr $1M
6 Contra Costa County
90.8
High 4.45 / yr $1M
7 Kern County
85.0
High 8.04 / yr $761K
8 Fresno County
84.7
High 12.75 / yr $761K
9 Merced County
84.6
High 6.60 / yr $739K
10 Placer County
81.9
High 14.21 / yr $983K
11 Riverside County
81.5
Medium 13.81 / yr $797K
12 San Diego County
80.9
Medium 11.11 / yr $829K
13 Plumas County
80.4
Medium 14.47 / yr $494K
14 Sierra County
77.6
Medium 15.88 / yr $538K
15 Tuolumne County
73.5
Medium 20.27 / yr $501K
16 Madera County
72.8
Medium 15.59 / yr $382K
17 Nevada County
70.5
Medium 14.29 / yr $492K
18 Ventura County
70.2
Medium 6.17 / yr $536K
19 Mariposa County
69.2
Medium 17.91 / yr $302K
20 El Dorado County
69.0
Medium 14.39 / yr $577K
21 San Mateo County
68.2
Medium 4.62 / yr $549K
22 Butte County
68.1
Medium 11.89 / yr $400K
23 Orange County
66.9
Medium 7.43 / yr $489K
24 Shasta County
66.8
Medium 14.19 / yr $432K
25 Monterey County
63.7
Medium 2.67 / yr $341K
26 Sacramento County
63.3
Medium 8.11 / yr $385K
27 Solano County
60.3
Medium 5.22 / yr $380K
28 Santa Cruz County
59.2
Medium 4.17 / yr $353K
29 Sonoma County
58.7
Medium 3.73 / yr $341K
30 Calaveras County
56.1
Low 14.17 / yr $251K
31 Santa Barbara County
55.4
Low 4.34 / yr $243K
32 Amador County
52.8
Low 13.76 / yr $247K
33 Sutter County
49.6
Low 8.43 / yr $199K
34 Kings County
48.2
Low 5.78 / yr $172K
35 Alameda County
47.5
Low 4.50 / yr $235K
36 Santa Clara County
46.9
Low 3.84 / yr $254K
37 Yolo County
44.3
Low 5.84 / yr $216K
38 Yuba County
40.0
Low 10.96 / yr $169K
39 Tehama County
39.6
Low 12.79 / yr $141K
40 Siskiyou County
35.3
Low 11.70 / yr $98K
41 Marin County
34.1
Low 3.29 / yr $146K
42 Inyo County
33.9
Low 15.90 / yr $88K
43 Lassen County
33.8
Low 15.51 / yr $101K
44 Humboldt County
32.9
Low 5.24 / yr $93K
45 Napa County
30.2
Low 4.22 / yr $110K
46 San Francisco County
29.9
Low 3.80 / yr $104K
47 Mendocino County
29.4
Low 5.32 / yr $79K
48 Mono County
27.2
Low 22.67 / yr $111K
49 San Luis Obispo County
25.4
Low 3.22 / yr $96K
50 Lake County
22.1
Very Low 5.39 / yr $59K
51 Glenn County
19.9
Very Low 7.90 / yr $84K
52 Colusa County
16.2
Very Low 6.06 / yr $50K
53 Imperial County
16.0
Very Low 11.27 / yr $35K
54 San Benito County
12.5
Very Low 3.22 / yr $61K
55 Del Norte County
12.4
Very Low 6.99 / yr $38K
56 Trinity County
11.3
Very Low 9.65 / yr $27K
57 Modoc County
9.9
Very Low 14.49 / yr $26K
58 Alpine County
3.1
Very Low 21.03 / yr $10K

58 California counties with measurable lightning risk. See the national lightning ranking or all California counties by overall risk.

Frequently Asked Questions

Which California county has the highest lightning risk?

Los Angeles County has the highest FEMA lightning risk score in California at 96.9 (Very High), with $2M in expected annual losses and about 8.36 events per year.

How many California counties face significant lightning risk?

58 California counties record measurable lightning risk in FEMA's National Risk Index; 10 of them are rated High or Very High.

Other Hazards in California