Climate
Castle Rock weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: May, June, September, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Snow | Wet days |
|---|---|---|---|---|---|
| January | 46°F | 18°F | 0.60 in | 8.0 in | 4 |
| February | 47°F | 20°F | 0.70 in | 10.7 in | 5 |
| March | 54°F | 27°F | 1.5 in | 10.7 in | 5 |
| April | 59°F | 33°F | 2.1 in | 8.3 in | 6 |
| May | 68°F | 42°F | 2.0 in | 1.1 in | 8 |
| June | 80°F | 51°F | 2.2 in | 0.00 in | 8 |
| July | 86°F | 56°F | 2.3 in | 0.00 in | 8 |
| August | 84°F | 55°F | 2.5 in | 0.00 in | 10 |
| September | 77°F | 47°F | 1.4 in | 0.40 in | 6 |
| October | 65°F | 35°F | 0.80 in | 2.7 in | 4 |
| November | 54°F | 26°F | 0.80 in | 6.7 in | 4 |
| December | 46°F | 18°F | 0.70 in | 8.9 in | 5 |
NOAA U.S. Climate Normals 1991–2020, Castle Rock, Co Us (3.8 mi away, 6,185 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Castle Rock?
July, with an average high of 86°F and low of 56°F.
What is the coldest month in Castle Rock?
January, with an average low of 18°F and high of 46°F.
When does it rain most in Castle Rock?
August is the wettest month, averaging 2.5 in of precipitation; the year totals about 17.6 inches.
Does it snow in Castle Rock?
Yes. Snowfall averages about 58 inches a year, mostly in February and March.
What is the best time to visit Castle Rock?
For mild weather (highs between 65°F and 85°F) with the least rain, May, June, September.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Castle Rock weather station, 3.8 miles from downtown: 30-year averages, not a forecast.