December weather forecast and climate
Castle Rock, CO

What is the coldest month in Castle Rock?

The coldest month is December, with an average high-temperature of 44.8°F (7.1°C) and an average low-temperature of 17.6°F (-8°C).

What is the average temperature in December in Castle Rock?

The average high-temperature, in December, in Castle Rock, is 44.8°F (7.1°C), while the average low-temperature is 17.6°F (-8°C).
Average temperature in December - Castle Rock, CO
  • Average high temperature in December: 44.7°F

The warmest month (with the highest average high temperature) is July (85.2°F).
The month with the lowest average high temperature is December (44.7°F).

  • Average low temperature in December: 17.6°F

The month with the highest average low temperature is July (55.7°F).
The coldest month (with the lowest average low temperature) is December (17.6°F).

Average rainfall in December - Castle Rock, CO
  • Average rainfall in December: 0.7"

The wettest month (with the highest rainfall) is August (2.7").
The driest month (with the lowest rainfall) is January (0.6").

Average rainfall days in December - Castle Rock, CO
  • Average rainfall days in December: 3.9 days

The month with the highest number of rainy days is August (9.4 days).
The month with the lowest number of rainy days is January (3.5 days).

Average snowfall in December - Castle Rock, CO
  • Average snowfall in December: 11"

The month with the highest snowfall is March (14.7").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in December - Castle Rock, CO
  • Average snowfall days in December: 3.7 days

The month with the highest number of snowfall days is March (3.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in December - Castle Rock, CO
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.4h).

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