| 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 | 60.1°F | Sep 08 |
| Albeni Falls forebay | ALFI | Jul 14 | Sep 04 | 53 | 74.3°F | Aug 13 |
| Albeni Falls tailwater | ALQI | Jul 14 | Sep 05 | 54 | 74.1°F | Aug 14 |
| Chief Joseph Dam forebay | CHJ | n/a | n/a | 0 | 64.7°F | Sep 02 |
| Chief Joseph tailwater | CHQW | n/a | n/a | 0 | 64.5°F | Sep 02 |
| Anatone - Snake River Near Anatone | ANQW | Jul 08 | Sep 10 | 65 | 74.4°F | Aug 07 |
| Dworshak - N. Fork Clearwater R at Ahsahka | DWQI | n/a | n/a | 0 | 50.7°F | Oct 28 |
| Peck - Clearwater River at Peck | PEKI | n/a | n/a | 0 | 58.5°F | Jul 08 |
| Lewiston - Clearwater River near Lewiston | LEWI | n/a | n/a | 0 | 59.5°F | Jul 08 |
| Lower Granite Dam forebay | LWG | n/a | n/a | 0 | 68.0°F | Jul 23 |
| Lower Granite tailwater - Snake R. below dam | LGNW | n/a | n/a | 0 | 67.9°F | Jul 24 |
| Little Goose Dam forebay | LGSA | Jul 14 | Aug 26 | 33 | 69.8°F | Jul 29 |
| Little Goose Dam tailwater (Snake R. below Little Goose) | LGSW | Jul 16 | Aug 26 | 31 | 69.4°F | Jul 29 |
| Lower Monumental Dam forebay on Snake River | LMNA | Jul 16 | Aug 31 | 44 | 70.0°F | Jul 21 |
| Lower Monumental tailwater below the dam on Snake River | LMNW | Jul 16 | Aug 31 | 44 | 70.0°F | Jul 29 |
| Ice Harbor Dam forebay | IHRA | Jul 15 | Sep 11 | 59 | 71.2°F | Aug 09 |
| Ice Harbor tailwater- Snake R. below Goose Is. | IDSW | Jul 14 | Sep 09 | 58 | 71.7°F | Aug 16 |
| Pasco - Columbia Rivers | PAQW | n/a | n/a | 0 | 67.6°F | Aug 19 |
| McNary Dam forebay on Columbia R. | MCNA | Aug 06 | Aug 24 | 19 | 69.1°F | Aug 17 |
| McNary Dam tailwater on Columbia R. | MCPW | Aug 06 | Aug 23 | 18 | 69.2°F | Aug 17 |
| John Day Dam forebay | JDY | Aug 04 | Sep 09 | 33 | 71.2°F | Aug 17 |
| John Day Dam tailwater | JHAW | Aug 04 | Sep 09 | 33 | 71.2°F | Aug 17 |
| The Dalles Dam forebay on Columbia R. | TDA | Aug 05 | Sep 09 | 30 | 71.2°F | Aug 17 |
| The Dalles tailwater Downstream | TDDO | Aug 04 | Sep 09 | 32 | 71.2°F | Aug 17 |
| Bonneville Dam forebay | BON | Aug 05 | Aug 31 | 27 | 71.3°F | Aug 18 |
| Cascade Island | CCIW | Aug 05 | Aug 31 | 27 | 71.4°F | Aug 17 |
| Warrendale | WRNO | Aug 05 | Aug 31 | 27 | 71.2°F | Aug 17 |
| Camas / Washougal | CWMW | Aug 05 | Sep 01 | 28 | 71.9°F | Aug 17 |
| Systemwide Project-Day Total | 715 | |||||
| Systemwide Max | Jul 08 | Sep 11 | 74.4°F | Aug 07 | ||