| 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 | 60.5°F | Sep 11 |
| Albeni Falls forebay | ALFI | Jul 12 | Sep 13 | 64 | 73.3°F | Aug 08 |
| Albeni Falls tailwater | ALQI | Jul 11 | Sep 14 | 66 | 73.3°F | Aug 08 |
| Chief Joseph Dam forebay | CHJ | n/a | n/a | 0 | 66.8°F | Sep 02 |
| Chief Joseph tailwater | CHQW | n/a | n/a | 0 | 66.0°F | Aug 31 |
| Anatone - Snake River Near Anatone | ANQW | Jul 06 | Sep 18 | 75 | 74.6°F | Aug 07 |
| Dworshak - N. Fork Clearwater R at Ahsahka | DWQI | n/a | n/a | 0 | 50.5°F | Oct 29 |
| Peck - Clearwater River at Peck | PEKI | n/a | n/a | 0 | 61.8°F | Jul 02 |
| Lewiston - Clearwater River near Lewiston | LEWI | n/a | n/a | 0 | 63.7°F | Jul 03 |
| Lower Granite Dam forebay | LWG | Aug 08 | Sep 05 | 9 | 69.0°F | Aug 28 |
| Lower Granite tailwater - Snake R. below dam | LGNW | Aug 06 | Sep 11 | 4 | 68.2°F | Sep 10 |
| Little Goose Dam forebay | LGSA | Jul 12 | Sep 05 | 42 | 70.0°F | Aug 13 |
| Little Goose Dam tailwater (Snake R. below Little Goose) | LGSW | Jul 13 | Sep 15 | 42 | 69.4°F | Aug 13 |
| Lower Monumental Dam forebay on Snake River | LMNA | Jul 14 | Sep 05 | 54 | 70.2°F | Aug 23 |
| Lower Monumental tailwater below the dam on Snake River | LMNW | Jul 13 | Sep 12 | 60 | 70.1°F | Aug 13 |
| Ice Harbor Dam forebay | IHRA | Jul 15 | Sep 12 | 60 | 71.0°F | Aug 23 |
| Ice Harbor tailwater- Snake R. below Goose Is. | IDSW | Jul 14 | Sep 19 | 68 | 71.3°F | Aug 10 |
| Pasco - Columbia Rivers | PAQW | Jul 30 | Sep 12 | 45 | 70.1°F | Aug 15 |
| McNary Dam forebay on Columbia R. | MCNA | Jul 15 | Sep 11 | 59 | 71.3°F | Sep 06 |
| McNary Dam tailwater on Columbia R. | MCPW | Jul 15 | Sep 19 | 67 | 71.2°F | Sep 07 |
| John Day Dam forebay | JDY | Jul 14 | Sep 16 | 65 | 72.4°F | Aug 09 |
| John Day Dam tailwater | JHAW | Jul 14 | Sep 24 | 73 | 72.3°F | Aug 10 |
| The Dalles Dam forebay on Columbia R. | TDA | Jul 14 | Sep 17 | 66 | 72.3°F | Aug 06 |
| The Dalles tailwater Downstream | TDDO | Jul 14 | Sep 21 | 70 | 72.5°F | Aug 06 |
| Bonneville Dam forebay | BON | Jul 14 | Sep 17 | 66 | 72.1°F | Aug 07 |
| Cascade Island | CCIW | Jul 13 | Sep 17 | 67 | 72.2°F | Aug 14 |
| Warrendale | WRNO | Jul 13 | Sep 20 | 70 | 72.2°F | Aug 14 |
| Camas / Washougal | CWMW | Jul 12 | Sep 16 | 67 | 72.6°F | Aug 06 |
| Systemwide Project-Day Total | 1259 | |||||
| Systemwide Max | Jul 06 | Sep 24 | 74.6°F | Aug 07 | ||