Castle Rock, CO Weather & Climate Normals
Castle Rock's real weather, in one number
Castle Rock, CO scores 44/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Castle Rock's hottest and coldest months
Castle Rock's hottest month is Jul, averaging 71°F; its coldest is Jan, averaging 32°F, a 39.3°F swing across the year, a middling gap by national standards.
Castle Rock's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 46°F | 18°F | 0.55in | 8in |
| Feb | 47°F | 20°F | 0.7in | 10.7in |
| Mar | 54°F | 27°F | 1.54in | 10.7in |
| Apr | 59°F | 33°F | 2.08in | 8.3in |
| May | 68°F | 42°F | 1.97in | 1.1in |
| Jun | 80°F | 51°F | 2.2in | 0in |
| Jul | 86°F | 56°F | 2.32in | 0in |
| Aug | 84°F | 55°F | 2.52in | 0in |
| Sep | 77°F | 47°F | 1.39in | 0.4in |
| Oct | 65°F | 35°F | 0.85in | 2.7in |
| Nov | 54°F | 26°F | 0.79in | 6.7in |
| Dec | 46°F | 18°F | 0.69in | 8.9in |
May, Jun, Jul, Aug, and Sep are the best time to see Castle Rock at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Castle Rock
Castle Rock averages 17.6in of precipitation a year across roughly 74 days with measurable rain or snow, and 57.5in of snow a year.
Where Castle Rock ranks
Castle Rock ranks 3663 of 4876 US cities in this dataset for comfort score, and 35 of 79 within CO. About 83,213 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Castle Rock, CO US, 3.7 miles from Castle Rock, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure