Ranked from NOAA 1991-2020 Climate Normals
Hottest Summers in California
Average daily high in the hottest month of the year, by county. Read it next to the cooling degree days in the same row: the two together are what the summer electricity bill is actually made of. Figures are NOAA 1991-2020 Climate Normals from the weather station nearest each county seat, so they describe a thirty-year average rather than any single year.
California ranked
| # | County | Summer high | Cooling degree days | Monthly to own |
|---|---|---|---|---|
| 1 | Inyo County | 114.9°F | 5,533 | $2,577 |
| 2 | Imperial County | 107.8°F | 4,162 | $2,201 |
| 3 | Riverside County | 106.9°F | 3,880 | $3,815 |
| 4 | San Bernardino County | 105.0°F | 3,129 | $3,521 |
| 5 | Shasta County | 99.9°F | 2,032 | $2,637 |
| 6 | Kings County | 98.7°F | 2,134 | $2,363 |
| 7 | Kern County | 98.3°F | 2,425 | $2,438 |
| 8 | Tehama County | 98.0°F | 1,926 | $2,400 |
| 9 | Fresno County | 97.7°F | 2,209 | $2,757 |
| 10 | Madera County | 97.7°F | 1,749 | $2,778 |
| 11 | Calaveras County | 97.1°F | 1,842 | $3,295 |
| 12 | Trinity County | 96.5°F | 888 | $2,466 |
| 13 | Tulare County | 96.3°F | 1,699 | $2,338 |
| 14 | Sutter County | 96.2°F | 1,499 | $3,023 |
| 15 | Yuba County | 96.2°F | 1,499 | $2,880 |
| 16 | Glenn County | 95.9°F | 1,364 | $2,561 |
| 17 | San Benito County | 95.9°F | 920 | $5,498 |
| 18 | Butte County | 95.8°F | 1,747 | $3,058 |
| 19 | Merced County | 95.6°F | 980 | $2,775 |
| 20 | San Joaquin County | 95.4°F | 1,566 | $3,681 |
| 21 | Solano County | 95.0°F | 1,391 | $4,335 |
| 22 | Stanislaus County | 95.0°F | 1,624 | $3,188 |
| 23 | Yolo County | 94.9°F | 1,416 | $4,374 |
| 24 | Sacramento County | 94.4°F | 1,576 | $3,707 |
| 25 | Lake County | 94.0°F | 1,005 | $2,433 |
| 26 | Amador County | 93.4°F | 1,431 | $3,157 |
| 27 | Siskiyou County | 93.4°F | 704 | $2,194 |
| 28 | Santa Barbara County | 93.2°F | 657 | $5,298 |
| 29 | Colusa County | 92.4°F | 1,329 | $2,817 |
| 30 | San Diego County | 90.8°F | 957 | $5,707 |
| 31 | El Dorado County | 90.3°F | 594 | $4,665 |
| 32 | Tuolumne County | 89.2°F | 812 | $3,035 |
| 33 | Modoc County | 89.1°F | 235 | $1,699 |
| 34 | Plumas County | 89.0°F | 283 | $2,505 |
| 35 | Los Angeles County | 88.9°F | 1,481 | $5,646 |
| 36 | Lassen County | 88.0°F | 456 | $2,035 |
| 37 | Alameda County | 87.7°F | 847 | $7,599 |
| 38 | Orange County | 87.3°F | 1,246 | $6,537 |
| 39 | Monterey County | 85.2°F | 578 | $5,210 |
| 40 | Napa County | 84.6°F | 604 | $6,031 |
| 41 | Mono County | 84.2°F | 299 | $3,819 |
| 42 | Sonoma County | 84.1°F | 410 | $5,631 |
| 43 | Mendocino County | 83.5°F | 195 | $3,593 |
| 44 | Contra Costa County | 82.8°F | 926 | $6,069 |
| 45 | Santa Clara County | 81.4°F | 624 | $9,799 |
| 46 | Marin County | 81.3°F | 486 | $9,864 |
| 47 | Alpine County | 80.4°F | 29 | $3,452 |
| 48 | Ventura County | 79.6°F | 643 | $5,542 |
| 49 | San Luis Obispo County | 79.5°F | 334 | $5,610 |
| 50 | Nevada County | 77.8°F | 552 | $4,423 |
| 51 | Placer County | 77.8°F | 552 | $4,872 |
| 52 | Sierra County | 77.8°F | 552 | $2,567 |
| 53 | Santa Cruz County | 76.7°F | 180 | $7,185 |
| 54 | Mariposa County | 74.9°F | 308 | $2,705 |
| 55 | San Francisco County | 70.2°F | 121 | $9,756 |
| 56 | San Mateo County | 66.4°F | 12 | $10,456 |
| 57 | Del Norte County | 64.5°F | 4 | $2,415 |
| 58 | Humboldt County | 64.0°F | 2 | $3,114 |
Every figure is modelled on the county's own median home with 20% down at 7.03%. Property tax and electricity are county and state specific; homeowners insurance uses the NAIC average premium for that state, which ranges from 0.16% of home value in Hawaii to 1.16% in Oklahoma. Maintenance and water are national estimates. Full methodology.
Nationwide
Hottest Summers across all 3,133 US counties · Every county in California