Castle Rock Colorado Climate Data

Monthly Average Climate Data for Castle Rock Colorado

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.0 °F44.9 °F0.62 in.
February18.3 °F45.5 °F0.67 in.
March25.4 °F53.6 °F1.5 in.
April31.5 °F59.8 °F2.3 in.
May40.6 °F68.7 °F2.19 in.
June50.0 °F80.5 °F2.15 in.
July56.1 °F86.5 °F2.35 in.
August54.5 °F84.2 °F2.45 in.
September46.4 °F77.4 °F1.44 in.
October34.4 °F64.9 °F0.98 in.
November25.0 °F53.1 °F0.76 in.
December17.0 °F44.3 °F0.64 in.
Annual34.7 °F63.6 °F18.05 in.

Climate Data for Castle Rock Colorado

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate