Mattawa, WA
Climate overview — based on NOAA 1991-2020 normals from PRIEST RAPIDS DAM, WA US.
Year-round temperatures (°F)
Climate summary
Mattawa has an annual average temperature of 56°F with about 7.5 inches of precipitation per year. The warmest month is July (average high 91.6°F), and the coldest is January (average low 29.6°F). December is typically the wettest month (1.40 in) and August the driest (0.08 in).
Best time to visit Mattawa
Full guide →Climate change signal
All-time records →58 of 366 (15.8%) of Mattawa'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.
| 1950s | 24 | |
| 1960s | 68 | |
| 1970s | 49 | |
| 1980s | 54 | |
| 1990s | 61 | |
| 2000s | 31 | |
| 2010s | 43 | |
| 2020s | 36 |
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 | 40.6°F | 29.6°F | 35.1°F | 1.08 in | — | 10 |
| February | 46.9°F | 32.1°F | 39.5°F | 0.62 in | — | 8 |
| March | 56.9°F | 37.9°F | 47.4°F | 0.74 in | — | 7 |
| April | 65.4°F | 44.8°F | 55.1°F | 0.55 in | — | 5 |
| May | 75.2°F | 52.7°F | 64.0°F | 0.55 in | — | 5 |
| June | 82.0°F | 59.6°F | 70.8°F | 0.54 in | — | 4 |
| July | 91.6°F | 66.5°F | 79.0°F | 0.21 in | — | 2 |
| August | 90.2°F | 65.9°F | 78.1°F | 0.08 in | — | 1 |
| September | 80.4°F | 57.7°F | 69.0°F | 0.15 in | — | 2 |
| October | 65.3°F | 46.4°F | 55.9°F | 0.65 in | — | 7 |
| November | 49.9°F | 36.2°F | 43.0°F | 0.91 in | — | 9 |
| December | 40.9°F | 29.9°F | 35.4°F | 1.40 in | — | 10 |
Climate twins of Mattawa
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).