Monthly weather forecast and climate
Castle Rock, CO

The scenic setting of Castle Rock City in Colorado
The scenic setting of Castle Rock City in Colorado

Weather in January

January, like December, in Castle Rock, Colorado, is a wintry winter month, with average temperature varying between 40.1°F (4.5°C) and 20.8°F (-6.2°C). In January, the average high-temperature is essentially the same as in December - a still wintry 40.1°F (4.5°C). Weather in January »

Weather in February

February, the last month of the winter, in Castle Rock, is another cold month, with temperature in the range of an average low of 20.7°F (-6.3°C) and an average high of 40.3°F (4.6°C). In Castle Rock, the average high-temperature in February is almost the same as in January - a still wintry 40.3°F (4.6°C). Weather in February »

Weather in March

March, the first month of the spring, in Castle Rock, is a cool month, with average temperature fluctuating between 28.8°F (-1.8°C) and 50.7°F (10.4°C). In Castle Rock, the average high-temperature in March increases, from a wintry 40.3°F (4.6°C) in February, to a fresh 50.7°F (10.4°C). Weather in March »

Weather in April

April in Castle Rock, Colorado, is a mild spring month, with average temperature fluctuating between 56.8°F (13.8°C) and 33.3°F (0.7°C). In April, the average high-temperature slightly increases, from a fresh 50.7°F (10.4°C) in March, to a moderate 56.8°F (13.8°C). Weather in April »

Weather in May

May, the last month of the spring, in Castle Rock, is an enjoyable month, with average temperature varying between 41.2°F (5.1°C) and 65.5°F (18.6°C). In May, the average high-temperature slightly increases, from a mild 56.8°F (13.8°C) in April, to an enjoyable 65.5°F (18.6°C). Weather in May »

Weather in June

June, the first month of the summer, in Castle Rock, is a warm month, with average temperature ranging between max 79.9°F (26.6°C) and min 52.9°F (11.6°C). In Castle Rock, the average high-temperature in June significantly increases, from a comfortable 65.5°F (18.6°C) in May, to a warm 79.9°F (26.6°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Castle Rock, Colorado, with temperature in the range of an average low of 57.2°F (14°C) and an average high of 83.3°F (28.5°C). The warmest month is July, with an average high-temperature of 83.3°F (28.5°C) and an average low-temperature of 57.2°F (14°C). The average heat index is estimated at 84°F (28.9°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Castle Rock, Colorado, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 56.5°F (13.6°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 82°F (27.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Castle Rock, Colorado, with average temperature fluctuating between 75.6°F (24.2°C) and 50.7°F (10.4°C). In September, the average high-temperature slightly decreases, from a moderately hot 82°F (27.8°C) in August, to a still warm 75.6°F (24.2°C). Weather in September »

Weather in October

October, the same as September, in Castle Rock, Colorado, is a moderate autumn month, with average temperature ranging between max 60.4°F (15.8°C) and min 37.8°F (3.2°C). In October, the average high-temperature plummets, from a warm 75.6°F (24.2°C) in September, to a moderate 60.4°F (15.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Castle Rock, Colorado, with average temperature fluctuating between 28.2°F (-2.1°C) and 50.2°F (10.1°C). In November, the average high-temperature decreases, from a moderate 60.4°F (15.8°C) in October, to a cool 50.2°F (10.1°C). Weather in November »

Weather in December

December, the first month of the winter, in Castle Rock, is still a cold month, with average temperature varying between 20.1°F (-6.6°C) and 39.6°F (4.2°C). December is the coldest month, with an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 20.1°F (-6.6°C). Weather in December »
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FAQ

How much does it rain in Castle Rock?

In Castle Rock, during the entire year, the rain falls for 107.3 days and collects up to 13.7" (348mm) of precipitation.

What is the driest month in Castle Rock?

Months with the least rainfall in Castle Rock, Colorado, are January and December Rain falls for 5.1 days and accumulates 0.55" (14mm) of rain.

When does it snow in Castle Rock?

January through June, October through December are months with snowfall in Castle Rock.

How much does it snow in Castle Rock?

Throughout the year, there are 51 snowfall days, and 40.43" (1027mm) of snow is accumulated.

When is the lowest UV index in Castle Rock?

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the most humid month in Castle Rock?

February is the most humid month, with an average relative humidity of 66%.

What is the month with the least sunshine in Castle Rock?

The month with the least sunshine in Castle Rock is February, with an average of 6.8h of sunshine.

What is the snowiest month in Castle Rock?

April is the month with the most snowfall. Snow falls for 6.8 days and accumulates 7.13" (181mm) of snow.

What is the rainiest month in Castle Rock?

The month with the most rainfall is May when the rain falls for 14.8 days and typically aggregates up to 2.24" (57mm) of precipitation.

What is the least humid month in Castle Rock?

Months with the lowest humidity are June and September, with an average relative humidity of 45%.

When are the longest days in Castle Rock?

With an average of 14.9h of daylight, June has the longest days of the year in Castle Rock.

What are the months with the most sunshine in Castle Rock?

Months with the most sunshine in Castle Rock, Colorado, are June through August, with an average of 11.8h of sunshine.

When is the highest UV index in Castle Rock?

June and July, with an average maximum UV index of 6, are months with the highest UV index.

What is the warmest month in Castle Rock?

July is the warmest month in Castle Rock, Colorado, with an average high-temperature of 83.3°F (28.5°C) and an average low-temperature of 57.2°F (14°C).

When it does not snow in Castle Rock?

In Castle Rock snow does not fall in July through September.

What is the coldest month in Castle Rock?

With an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 20.1°F (-6.6°C), December is the coldest month.

What is the month with the shortest days in Castle Rock?

December has the shortest days of the year in Castle Rock, with an average of 9.4h of daylight.

Average temperature
Castle Rock, CO

Average temperature - Castle Rock, CO

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is December (39.6°F).

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (20.1°F).

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Average pressure
Castle Rock, CO

Average pressure - Castle Rock, CO

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are April and June (29.91").

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Average wind speed
Castle Rock, CO

Average wind speed - Castle Rock, CO

The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest months (with the lowest average wind speed) are July, August and September (6.5mph).

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Average humidity
Castle Rock, CO

Average humidity - Castle Rock, CO

The month with the highest relative humidity is February (66%).
Months with the lowest relative humidity are June and September (45%).

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Average rainfall
Castle Rock, CO

Average rainfall - Castle Rock, CO

The wettest month (with the highest rainfall) is May (2.24").
The driest months (with the least rainfall) are January and December (0.55").

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Average rainfall days
Castle Rock, CO

Average rainfall days - Castle Rock, CO

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is November (3 days).

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Average snowfall
Castle Rock, CO

Average snowfall - Castle Rock, CO

The month with the highest snowfall is April (7.13").
Months with the least snowfall are July, August and September (0").

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Average snowfall days
Castle Rock, CO

Average snowfall days - Castle Rock, CO

The month with the highest number of snowfall days is February (9.8 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Castle Rock, CO

Average daylight / Average sunshine - Castle Rock, CO

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

Months with the most sunshine are June, July and August (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 6.8h).

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Average sunshine days
Castle Rock, CO

Average sunshine days - Castle Rock, CO

The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is July (10.6 days).

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Average UV index
Castle Rock, CO

Average UV index - Castle Rock, CO

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average visibility
Castle Rock, CO

Average visibility - Castle Rock, CO

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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