| 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 | 62.4°F | Aug 20 |
| Albeni Falls forebay | ALFI | Jul 15 | Aug 28 | 45 | 74.3°F | Aug 11 |
| Albeni Falls tailwater | ALQI | Jul 14 | Aug 29 | 47 | 74.4°F | Aug 01 |
| Chief Joseph Dam forebay | CHJ | n/a | n/a | 0 | 67.1°F | Aug 31 |
| Chief Joseph tailwater | CHQW | n/a | n/a | 0 | 66.8°F | Aug 31 |
| Anatone - Snake River Near Anatone | ANQW | Jul 06 | Sep 05 | 62 | 75.3°F | Aug 10 |
| Dworshak - N. Fork Clearwater R at Ahsahka | DWQI | Nov 29 | Nov 30 | 2 | 115.1°F | Nov 29 |
| Peck - Clearwater River at Peck | PEKI | n/a | n/a | 0 | 57.2°F | Jun 26 |
| Lewiston - Clearwater River near Lewiston | LEWI | n/a | n/a | 0 | 59.2°F | Jun 27 |
| Lower Granite Dam forebay | LWG | Jul 30 | Aug 28 | 12 | 69.3°F | Aug 22 |
| Lower Granite tailwater - Snake R. below dam | LGNW | Jul 23 | Jul 31 | 3 | 68.7°F | Jul 30 |
| Little Goose Dam forebay | LGSA | Jul 16 | Aug 26 | 37 | 70.8°F | Aug 04 |
| Little Goose Dam tailwater (Snake R. below Little Goose) | LGSW | Jul 16 | Aug 28 | 37 | 70.4°F | Aug 04 |
| Lower Monumental Dam forebay on Snake River | LMNA | Jul 15 | Sep 02 | 46 | 70.8°F | Aug 08 |
| Lower Monumental tailwater below the dam on Snake River | LMNW | Jul 15 | Sep 02 | 48 | 70.6°F | Aug 09 |
| Ice Harbor Dam forebay | IHRA | Jul 14 | Sep 04 | 53 | 71.9°F | Aug 12 |
| Ice Harbor tailwater- Snake R. below Goose Is. | IDSW | Jul 11 | Sep 12 | 64 | 72.2°F | Aug 13 |
| Pasco - Columbia Rivers | PAQW | Jul 27 | Aug 23 | 28 | 70.4°F | Aug 11 |
| McNary Dam forebay on Columbia R. | MCNA | Jul 15 | Sep 05 | 46 | 71.6°F | Aug 10 |
| McNary Dam tailwater on Columbia R. | MCPW | Jul 15 | Sep 12 | 54 | 71.5°F | Aug 13 |
| John Day Dam forebay | JDY | Jul 14 | Sep 10 | 59 | 73.0°F | Aug 08 |
| John Day Dam tailwater | JHAW | Jul 14 | Sep 11 | 60 | 72.7°F | Jul 30 |
| The Dalles Dam forebay on Columbia R. | TDA | Jul 13 | Sep 08 | 55 | 72.8°F | Aug 09 |
| The Dalles tailwater Downstream | TDDO | Jul 13 | Sep 09 | 57 | 73.0°F | Aug 09 |
| Bonneville Dam forebay | BON | Jul 13 | Aug 29 | 48 | 73.3°F | Aug 09 |
| Cascade Island | CCIW | Jul 13 | Sep 02 | 52 | 73.3°F | Aug 09 |
| Warrendale | WRNO | Jul 13 | Sep 08 | 54 | 73.4°F | Aug 10 |
| Camas / Washougal | CWMW | Jul 08 | Sep 10 | 60 | 74.0°F | Aug 10 |
| Systemwide Project-Day Total | 1029 | |||||
| Systemwide Max | Jul 06 | Nov 30 | 115.1°F | Nov 29 | ||