Ranked from NOAA 1991-2020 Climate Normals
Hottest Summers in Idaho
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.
Idaho ranked
| # | County | Summer high | Cooling degree days | Monthly to own |
|---|---|---|---|---|
| 1 | Payette County | 95.1°F | 1,100 | $2,288 |
| 2 | Ada County | 92.7°F | 1,045 | $3,448 |
| 3 | Boise County | 92.7°F | 1,045 | $3,028 |
| 4 | Elmore County | 92.7°F | 1,045 | $2,109 |
| 5 | Gem County | 92.5°F | 493 | $2,656 |
| 6 | Washington County | 92.5°F | 693 | $1,901 |
| 7 | Gooding County | 91.9°F | 671 | $1,775 |
| 8 | Nez Perce County | 90.8°F | 913 | $2,263 |
| 9 | Oneida County | 90.6°F | 435 | $1,747 |
| 10 | Power County | 90.4°F | 608 | $1,546 |
| 11 | Canyon County | 89.9°F | 771 | $2,594 |
| 12 | Jerome County | 89.6°F | 714 | $1,950 |
| 13 | Franklin County | 89.2°F | 461 | $2,259 |
| 14 | Lincoln County | 88.9°F | 489 | $1,596 |
| 15 | Twin Falls County | 88.4°F | 617 | $2,224 |
| 16 | Cassia County | 87.9°F | 492 | $1,931 |
| 17 | Minidoka County | 87.9°F | 492 | $1,797 |
| 18 | Owyhee County | 87.7°F | 457 | $2,103 |
| 19 | Bannock County | 87.3°F | 348 | $2,058 |
| 20 | Bingham County | 86.9°F | 518 | $1,956 |
| 21 | Custer County | 86.9°F | 312 | $2,155 |
| 22 | Lemhi County | 86.9°F | 312 | $2,086 |
| 23 | Blaine County | 86.8°F | 185 | $4,637 |
| 24 | Caribou County | 86.8°F | 180 | $1,710 |
| 25 | Butte County | 86.6°F | 313 | $1,526 |
| 26 | Jefferson County | 86.6°F | 249 | $2,478 |
| 27 | Valley County | 86.6°F | 198 | $4,162 |
| 28 | Boundary County | 84.8°F | 355 | $2,507 |
| 29 | Madison County | 84.8°F | 258 | $2,672 |
| 30 | Bear Lake County | 84.6°F | 139 | $1,777 |
| 31 | Benewah County | 84.5°F | 331 | $1,943 |
| 32 | Camas County | 84.0°F | 216 | $1,870 |
| 33 | Latah County | 83.4°F | 284 | $2,572 |
| 34 | Clark County | 83.3°F | 208 | $1,539 |
| 35 | Kootenai County | 83.0°F | 436 | $3,357 |
| 36 | Idaho County | 82.9°F | 69 | $2,090 |
| 37 | Teton County | 82.9°F | 120 | $4,163 |
| 38 | Fremont County | 82.7°F | 210 | $2,105 |
| 39 | Bonner County | 81.9°F | 233 | $3,100 |
| 40 | Adams County | 81.0°F | 112 | $2,394 |
| 41 | Bonneville County | 80.9°F | 136 | $2,430 |
| 42 | Lewis County | 80.7°F | 148 | $1,598 |
| 43 | Clearwater County | 80.1°F | 73 | $1,851 |
| 44 | Shoshone County | 69.8°F | 102 | $1,721 |
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 Idaho