The Midwest, the Northern Rockies and the Southwest The Record
MILEPOST 1390
58 counties set all-time record highs in July 12–15
Across Colorado, Idaho, Michigan, Montana and 4 more, the highest readings in each county's series since 1951. The warmest was Custer, Montana, at 112.9°F.
Between July 12 and July 15, 2026, 58 counties across 8 states recorded the highest value in their county series, which begins in 1951. The series is NOAA/NCEI nClimGrid-Daily, a gridded county-area average — so these are areal extremes, not single-station readings, and they are not directly comparable to a co-op station's record book.
| County | State | °F | Date |
|---|---|---|---|
| Custer | Montana | 112.9 | Jul 13 |
| Prairie | Montana | 112.8 | Jul 13 |
| Garfield | Montana | 111.7 | Jul 13 |
| Petroleum | Montana | 111.1 | Jul 13 |
| Dawson | Montana | 110.8 | Jul 13 |
| Fallon | Montana | 110.5 | Jul 13 |
| McCone | Montana | 110.4 | Jul 13 |
| Wibaux | Montana | 110.0 | Jul 13 |
| Rosebud | Montana | 109.9 | Jul 13 |
| Yellowstone | Montana | 109.9 | Jul 13 |
| Carter | Montana | 109.8 | Jul 13 |
| Powder River | Montana | 109.7 | Jul 13 |
| Golden Valley | North Dakota | 109.5 | Jul 13 |
| Treasure | Montana | 109.4 | Jul 13 |
| Bowman | North Dakota | 109.4 | Jul 13 |
| Harding | South Dakota | 109.3 | Jul 13 |
| Musselshell | Montana | 109.2 | Jul 13 |
| Billings | North Dakota | 108.7 | Jul 13 |
| Slope | North Dakota | 108.7 | Jul 13 |
| Golden Valley | Montana | 106.0 | Jul 13 |
| Tooele | Utah | 105.6 | Jul 13 |
| Millard | Utah | 105.4 | Jul 13 |
| Campbell | Wyoming | 105.1 | Jul 13 |
| Stillwater | Montana | 104.9 | Jul 13 |
| Juab | Utah | 104.4 | Jul 13 |
| Washakie | Wyoming | 102.9 | Jul 13 |
| Carbon | Montana | 102.7 | Jul 13 |
| Davis | Utah | 102.3 | Jul 13 |
| Oneida | Idaho | 101.8 | Jul 13 |
| Salt Lake | Utah | 101.2 | Jul 13 |
| Bannock | Idaho | 101.1 | Jul 13 |
| Johnson | Wyoming | 101.0 | Jul 13 |
| Sheridan | Wyoming | 100.8 | Jul 13 |
| Big Horn | Wyoming | 100.4 | Jul 13 |
| Hot Springs | Wyoming | 100.0 | Jul 13 |
| Dickinson | Michigan | 100.0 | Jul 14 |
| Sweet Grass | Montana | 99.5 | Jul 13 |
| Franklin | Idaho | 99.4 | Jul 13 |
| Weber | Utah | 99.1 | Jul 13 |
| Iosco | Michigan | 98.9 | Jul 15 |
| Marquette | Michigan | 98.7 | Jul 14 |
| Caribou | Idaho | 98.0 | Jul 13 |
| Alcona | Michigan | 97.9 | Jul 15 |
| Bonneville | Idaho | 97.7 | Jul 13 |
| Moffat | Colorado | 97.5 | Jul 13 |
| Fremont | Wyoming | 96.2 | Jul 13 |
| Cache | Utah | 96.0 | Jul 13 |
| Gallatin | Montana | 95.9 | Jul 13 |
| Alger | Michigan | 95.8 | Jul 15 |
| Park | Montana | 95.0 | Jul 13 |
| Rio Blanco | Colorado | 94.9 | Jul 13 |
| Carbon | Wyoming | 93.8 | Jul 13 |
| Park | Wyoming | 93.2 | Jul 13 |
| Lincoln | Wyoming | 92.9 | Jul 13 |
| Sublette | Wyoming | 91.7 | Jul 13 |
| Routt | Colorado | 90.2 | Jul 13 |
| Dolores | Colorado | 90.1 | Jul 12 |
| Teton | Wyoming | 88.9 | Jul 13 |
The numbers in this piece, with what they are measured against
| counties setting an all-time high NOAA/NCEI nClimGrid-Daily |
58 counties | of 3,107 1951-present |
| highest in the outbreak — Custer, Montana NOAA/NCEI nClimGrid-Daily (county-area) |
112.9 °F | 1 of 58 1951-present |
- Milepost
- 1390 · laid 2026-10-15T14:25:18Z
- Model
- nClimGrid-Daily
- Desk
- records v2
- Method
- county-area daily extreme vs. the same county's series extreme over the full period of record
- Source
- /var/www/weather.city/data/records.json
- Digest
- b2cb8c25dc52b2240b73cab6b1a28490d18aa5bf98b3a72864c4c80179c1de2a
- Machine
- JSON