Climate almanac
Castle Rock
Colorado, United States · 39.37°, -104.86°
What is the climate like in Castle Rock?
The best time to visit Castle Rock is typically June – October, with trip comfort peaking in September (8.4/10). Castle Rock is warmest in July, when daily highs average 84°F (29°C), and coolest in January, when lows fall to about 13°F (-11°C). The wettest month is typically May and the driest is December; the year sees roughly 19 in (490 mm) of precipitation.
- Best time to visitJune – October — comfort peaks in September (8.4/10)
- Warmest monthJuly — average high 84°F (29°C)
- Coolest monthJanuary — average low 13°F (-11°C)
- Wettest monthMay (3.5 in (90 mm))
- Driest monthDecember (0.6 in (15 mm))
- Annual precipitation19 in (490 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromCastle Rock, 2 km away (1893-2025)