Coulee Dam, WA
Climate overview — based on NOAA 1991-2020 normals from COULEE DAM 1 SW, WA US.
Year-round temperatures (°F)
Climate summary
Coulee Dam has an annual average temperature of 49.9°F with about 11.1 inches of precipitation per year. The warmest month is July (average high 87.6°F), and the coldest is January (average low 23.3°F). December is typically the wettest month (1.42 in) and August the driest (0.33 in).
Best time to visit Coulee Dam
Full guide →Climate change signal
All-time records →32 of 366 (8.7%) of Coulee Dam's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1930s | 102 | |
| 1940s | 59 | |
| 1950s | 16 | |
| 1960s | 31 | |
| 1970s | 29 | |
| 1980s | 35 | |
| 1990s | 21 | |
| 2000s | 32 | |
| 2010s | 20 | |
| 2020s | 21 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 32.7°F | 23.3°F | 28.0°F | 1.15 in | — | 11 |
| February | 39.5°F | 25.3°F | 32.4°F | 0.88 in | — | 9 |
| March | 50.7°F | 31.5°F | 41.1°F | 1.07 in | — | 10 |
| April | 60.6°F | 37.7°F | 49.2°F | 0.97 in | — | 9 |
| May | 70.8°F | 45.8°F | 58.3°F | 1.11 in | — | 8 |
| June | 77.8°F | 52.0°F | 64.9°F | 1.15 in | — | 7 |
| July | 87.6°F | 59.4°F | 73.5°F | 0.49 in | — | 3 |
| August | 86.9°F | 58.3°F | 72.6°F | 0.33 in | — | 3 |
| September | 76.8°F | 50.5°F | 63.7°F | 0.36 in | — | 4 |
| October | 60.2°F | 40.1°F | 50.1°F | 0.94 in | — | 7 |
| November | 43.0°F | 30.9°F | 37.0°F | 1.20 in | — | 11 |
| December | 33.1°F | 23.9°F | 28.5°F | 1.42 in | — | 12 |
Climate twins of Coulee Dam
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).