| 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 | 58.6°F | Jul 17 |
| Albeni Falls forebay | ALFI | Jul 19 | Sep 03 | 47 | 73.5°F | Jul 30 |
| Albeni Falls tailwater | ALQI | Jul 03 | Sep 04 | 50 | 73.6°F | Jul 30 |
| Chief Joseph Dam forebay | CHJ | n/a | n/a | 0 | 65.9°F | Aug 19 |
| Chief Joseph tailwater | CHQW | n/a | n/a | 0 | 65.5°F | Aug 18 |
| Anatone - Snake River Near Anatone | ANQW | Jun 27 | Sep 11 | 71 | 75.1°F | Jul 30 |
| Dworshak - N. Fork Clearwater R at Ahsahka | DWQI | n/a | n/a | 0 | 50.6°F | Oct 13 |
| Peck - Clearwater River at Peck | PEKI | Apr 29 | May 08 | 8 | 83.6°F | May 01 |
| Lewiston - Clearwater River near Lewiston | LEWI | n/a | n/a | 0 | 62.7°F | Jun 26 |
| Lower Granite Dam forebay | LWG | n/a | n/a | 0 | 67.3°F | Sep 07 |
| Lower Granite tailwater - Snake R. below dam | LGNW | n/a | n/a | 0 | 67.5°F | Jul 02 |
| Little Goose Dam forebay | LGSA | Jul 04 | Aug 29 | 15 | 69.1°F | Aug 04 |
| Little Goose Dam tailwater (Snake R. below Little Goose) | LGSW | Jul 06 | Aug 20 | 12 | 69.0°F | Aug 04 |
| Lower Monumental Dam forebay on Snake River | LMNA | Jul 09 | Sep 04 | 40 | 70.0°F | Aug 19 |
| Lower Monumental tailwater below the dam on Snake River | LMNW | Jul 09 | Sep 04 | 44 | 69.8°F | Aug 05 |
| Ice Harbor Dam forebay | IHRA | Jul 11 | Sep 06 | 58 | 70.7°F | Aug 09 |
| Ice Harbor tailwater- Snake R. below Goose Is. | IDSW | Jul 11 | Sep 10 | 62 | 71.2°F | Aug 19 |
| Pasco - Columbia Rivers | PAQW | Jul 27 | Sep 01 | 31 | 70.0°F | Aug 18 |
| McNary Dam forebay on Columbia R. | MCNA | Jul 17 | Sep 06 | 47 | 71.5°F | Aug 20 |
| McNary Dam tailwater on Columbia R. | MCPW | Jul 17 | Sep 06 | 47 | 71.7°F | Aug 19 |
| John Day Dam forebay | JDY | Jul 08 | Sep 14 | 66 | 73.0°F | Aug 19 |
| John Day Dam tailwater | JHAW | Jul 08 | Sep 13 | 66 | 72.6°F | Aug 20 |
| The Dalles Dam forebay on Columbia R. | TDA | Jul 09 | Sep 11 | 62 | 72.6°F | Aug 21 |
| The Dalles tailwater Downstream | TDDO | Jul 09 | Sep 12 | 65 | 72.6°F | Aug 21 |
| Bonneville Dam forebay | BON | Jul 13 | Sep 08 | 56 | 72.0°F | Aug 27 |
| Cascade Island | CCIW | Jul 13 | Sep 09 | 57 | 72.0°F | Aug 27 |
| Warrendale | WRNO | Jul 13 | Sep 07 | 56 | 71.9°F | Aug 28 |
| Camas / Washougal | CWMW | Jul 11 | Sep 09 | 61 | 72.3°F | Aug 29 |
| Systemwide Project-Day Total | 1021 | |||||
| Systemwide Max | Apr 29 | Sep 14 | 83.6°F | May 01 | ||