Castle Rock, WA
Climate overview — based on NOAA 1991-2020 normals from LONGVIEW, WA US.
Year-round temperatures (°F)
Climate summary
Castle Rock has an annual average temperature of 53.2°F with about 48.1 inches of precipitation per year. The warmest month is August (average high 80.4°F), and the coldest is February (average low 34.7°F). November is typically the wettest month (7.24 in) and July the driest (0.63 in).
Best time to visit Castle Rock
Full guide →Climate change signal
All-time records →73 of 366 (19.9%) of Castle Rock'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.
| 1920s | 18 | |
| 1930s | 28 | |
| 1940s | 37 | |
| 1950s | 39 | |
| 1960s | 29 | |
| 1970s | 25 | |
| 1980s | 29 | |
| 1990s | 35 | |
| 2000s | 44 | |
| 2010s | 45 | |
| 2020s | 37 |
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 | 47.7°F | 35.1°F | 41.4°F | 6.53 in | — | 24 |
| February | 52.0°F | 34.7°F | 43.4°F | 4.81 in | — | 20 |
| March | 56.9°F | 37.5°F | 47.2°F | 4.91 in | — | 21 |
| April | 62.1°F | 40.4°F | 51.2°F | 4.08 in | — | 19 |
| May | 68.8°F | 45.3°F | 57.1°F | 3.11 in | — | 14 |
| June | 72.9°F | 49.5°F | 61.2°F | 2.03 in | — | 11 |
| July | 79.3°F | 53.4°F | 66.4°F | 0.63 in | — | 5 |
| August | 80.4°F | 53.3°F | 66.9°F | 0.97 in | — | 5 |
| September | 75.7°F | 49.6°F | 62.6°F | 2.29 in | — | 9 |
| October | 64.0°F | 44.1°F | 54.0°F | 4.38 in | — | 17 |
| November | 53.0°F | 38.6°F | 45.8°F | 7.24 in | — | 23 |
| December | 46.6°F | 34.8°F | 40.7°F | 7.14 in | — | 24 |
Climate twins of Castle Rock
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).