| Gauge Name |
Gauge ID |
Date of First Daily Average Temperature over 68°F |
Date of Last Daily Average Temperature over 68°F |
Days with Daily Average Temperature over 68°F |
Maximum Daily Temperature During Year |
Date of Maximum Daily Temperature |
|---|---|---|---|---|---|---|
| Libby Dam and Lake Koocanusa near Libby | LBQM | n/a | n/a | 0 | 60.4°F | Aug 08 |
| Albeni Falls forebay | ALFI | Jul 04 | Sep 19 | 76 | 75.2°F | Aug 13 |
| Albeni Falls tailwater | ALQI | Jul 04 | Sep 19 | 76 | 84.8°F | Jul 19 |
| Chief Joseph Dam forebay | CHJ | Sep 16 | Sep 16 | 1 | 68.1°F | Sep 16 |
| Chief Joseph tailwater | CHQW | n/a | n/a | 0 | 67.9°F | Sep 16 |
| Anatone - Snake River Near Anatone | ANQW | Jun 30 | Sep 11 | 74 | 74.2°F | Aug 17 |
| Dworshak - N. Fork Clearwater R at Ahsahka | DWQI | n/a | n/a | 0 | 51.5°F | Oct 28 |
| Peck - Clearwater River at Peck | PEKI | n/a | n/a | 0 | 59.9°F | Jun 29 |
| Lewiston - Clearwater River near Lewiston | LEWI | n/a | n/a | 0 | 61.3°F | Jun 30 |
| Lower Granite Dam forebay | LWG | Sep 03 | Sep 11 | 9 | 69.4°F | Sep 11 |
| Lower Granite tailwater - Snake R. below dam | LGNW | Aug 22 | Sep 22 | 6 | 69.0°F | Sep 20 |
| Little Goose Dam forebay | LGSA | Jul 07 | Sep 05 | 37 | 69.5°F | Jul 10 |
| Little Goose Dam tailwater (Snake R. below Little Goose) | LGSW | Jul 09 | Sep 21 | 38 | 69.2°F | Jul 14 |
| Lower Monumental Dam forebay on Snake River | LMNA | Jul 10 | Sep 06 | 59 | 70.2°F | Aug 31 |
| Lower Monumental tailwater below the dam on Snake River | LMNW | Jul 12 | Sep 20 | 71 | 69.9°F | Jul 23 |
| Ice Harbor Dam forebay | IHRA | Jul 13 | Sep 22 | 72 | 71.2°F | Jul 27 |
| Ice Harbor tailwater- Snake R. below Goose Is. | IDSW | Jul 12 | Sep 21 | 72 | 71.6°F | Jul 26 |
| Pasco - Columbia Rivers | PAQW | Jul 25 | Sep 18 | 53 | 71.2°F | Sep 14 |
| McNary Dam forebay on Columbia R. | MCNA | Jul 20 | Sep 22 | 65 | 71.7°F | Aug 21 |
| McNary Dam tailwater on Columbia R. | MCPW | Jul 20 | Sep 22 | 65 | 71.5°F | Sep 15 |
| John Day Dam forebay | JDY | Jul 14 | Sep 17 | 66 | 73.1°F | Sep 11 |
| John Day Dam tailwater | JHAW | Jul 14 | Sep 26 | 74 | 72.5°F | Aug 22 |
| The Dalles Dam forebay on Columbia R. | TDA | Jul 14 | Sep 18 | 67 | 72.5°F | Sep 12 |
| The Dalles tailwater Downstream | TDDO | Jul 14 | Sep 25 | 73 | 72.6°F | Sep 13 |
| Bonneville Dam forebay | BON | Jul 15 | Sep 18 | 66 | 72.3°F | Sep 01 |
| Cascade Island | CCIW | Jul 14 | Aug 29 | 47 | 72.0°F | Aug 07 |
| Warrendale | WRNO | Jul 14 | Sep 22 | 71 | 72.3°F | Sep 01 |
| Camas / Washougal | CWMW | Jul 10 | Sep 19 | 70 | 72.8°F | Sep 02 |
| Systemwide Total | Jun 30 | Sep 26 | 1308 | 84.8°F | Jul 19 | |