Castle Rock (CO) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Castle Rock

Castle Rock average temperature chart (Celsius) Castle Rock average temperature chart (Fahrenheit)
Average monthly temperatures in Castle Rock (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6 7.6 10 15.1 20 25.8 29.3 27.9 23.4 18.1 10.8 6.5
°F 42.8 45.6 50 59.1 68 78.5 84.8 82.3 74.2 64.6 51.4 43.7

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Castle Rock monthly rainfall chart (mm) Castle Rock monthly rainfall chart (inches)
Average monthly rainfall in Castle Rock (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 12 17 33 40 64 46 64 58 31 24 20 15
inches 0.5 0.7 1.3 1.6 2.5 1.8 2.5 2.3 1.2 1 0.8 0.6
Rainy days 6 6 9 8 10 9 10 10 7 5 5 6

Average annual rainfall in Castle Rock: 357.4mm (140.7 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Castle Rock

Castle Rock average daily sunshine chart
Average daily sunshine Castle Rock
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.8 8.3 9 10.1 10.3 11.4 11.2 10.5 9.8 8.8 7.3 7.1

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Castle Rock average minimum / maximum temperatures (Celsius) Castle Rock average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Castle Rock (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -10.2 -8.6 -6 -1.3 3.6 8.4 11.7 10.7 6 0.1 -5.6 -9.1
Max °C 6.4 8 10.4 15.5 20.4 26.3 29.8 28.4 23.9 18.6 11.2 6.9
Min °F 13.6 16.6 21.2 29.8 38.5 47 53 51.2 42.7 32.1 21.9 15.6
Max °F 28.6 31.5 36 44.8 53.6 63.1 69.3 67.1 58.8 48.7 37 30

Sea temperature

The graph below shows the average sea temperature.

Castle Rock average sea temperature chart (Celsius) Castle Rock average sea temperature chart (Fahrenheit)
Average sea temperature around Castle Rock in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 11 10.7 11.1 11.8 13.3 15.2 17.3 19.1 18.3 16 13.6 11.9
°F 51.7 51.3 51.9 53.3 55.9 59.3 63.2 66.4 65 60.7 56.6 53.4

Wind speed

The graph below shows the average wind speed.

Castle Rock average winspeed by month (km/h) Castle Rock average winspeed by month (mph)
Average wind speed in Castle Rock (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 16 16 17 18 17 16 16 15 16 16 15 15
mph 10 10 11 11 11 10 10 9 10 10 9 9

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Castle Rock relative humidity averages
Average relative humidity in Castle Rock
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
54% 53% 52% 48% 50% 48% 49% 51% 50% 48% 54% 55%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Castle Rock weather stats

Castle Rock weather statistics
Hottest month: July 29.3°C 84.7°F
Driest month: January 12mm 0.5ins
Sunniest month: September 9.8hrs
Coldest month: January 6°C 42.8°F
Wettest month: May 64mm 2.5ins
Warmest sea: August 19.1°C 66.4°F
Map showing location of Castle Rock (39.37221, -104.85609) Castle Rock map pin © Google

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