Yearly & Monthly weather - Castle Rock, CO

The climate of Castle Rock
The best time to visit Castle Rock
The worst time to visit Castle Rock
Spring weather in Castle Rock
Summer weather in Castle Rock
Autumn weather in Castle Rock
Winter weather in Castle Rock
Weather in January
Weather in February
Weather in March
Weather in April
Weather in May
Weather in June
Weather in July
Weather in August
Weather in September
Weather in October
Weather in November
Weather in December
Frequently asked questions
Average temperature
Average pressure
Average wind speed
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

The scenic setting of Castle Rock City in Colorado

The climate of Castle Rock

Located in Colorado, USA, Castle Rock belongs to the BSk category according to the Köppen's climate classification. This designation recognizes it as a mid-latitude steppe region where semi-arid conditions predominate. The weather here displays variation not only seasonally but also within the spectrum of individual weather elements throughout the year.

Temperature ranges recorded over a year show variation from lows of 20.1°F (-6.6°C) to highs reaching 83.3°F (28.5°C). Averaged over the year, the relative humidity hovers between 45% and 66%. It is important to note that the town sees rainfall measurements from 0.55" (14mm) to 2.24" (57mm) spread through days ranging from 3 to 15.1 per month. The region experiences snowfall as well, with measurements between 0" (0mm) to 7.13" (181mm) falling on a range of days from none to a maximum of 9.8 in a month.

The daylight duration in Castle Rock varies between 9.4 hours to 14.9 hours, with sunshine occupying 6.8 hours to 11.8 hours per day, exhibiting variation across the year. The standard UV index typically stays on the lower side, fluctuating between 2 and 6, while visibility remains steady at 6 miles. Cloud coverage moves within a range of 15% to 27%, and the atmospheric pressure is observed to fluctuate from 29.91" (760mm) to 30.13" (765mm).

Wind speeds recorded range from 6.5mph (10.5km/h) to 7.9mph (12.7km/h) with maximum speeds varying from 7.3mph (11.7km/h) to 8.7mph (14km/h). Gusts of wind have been reported to reach between 10.6mph (17.1km/h) and 12.8mph (20.6km/h).

The best time to visit Castle Rock

Taking into account the temperature, precipitation, and sunshine hours, it appears the best time to visit Castle Rock would be during the summer months. During this time, the temperature ranges from a pleasant 65.5°F (18.6°C) to a maximum of 83.3°F (28.5°C). Additionally, summer presents an average humidity of around 45%, which is on the lower end of the scale, promoting a more comfortable environment.

The worst time to visit Castle Rock

Based on the climate data, the least favorable time to visit Castle Rock would arguably be the winter months when the temperature can plummet to lows of 20.1°F (-6.6°C). Additionally, these colder months are also when the region records the highest levels of snowfall with measures from 3.58" (91mm) to 7.13" (181mm).

Spring weather in Castle Rock

Spring weather in Castle Rock is marked by an increase in temperatures from 40.3°F (4.6°C) in February rising up to 65.5°F (18.6°C) by May. Humidity during this time fluctuates from 53% to 54%, indicating relatively dry conditions. Rainfall in spring is relatively moderate, with falls ranging from 0.83" (21mm) to 2.24" (57mm) distributed over days from 4.6 to 14.8 per month. The number of sunshine hours continue to rise, reaching 11.1 hours by May.

Summer weather in Castle Rock

In Castle Rock, summers are warm and comfortable. The temperature ranges from 65.5°F (18.6°C) to 83.3°F (28.5°C), and relative humidity varies from 45% to 49% making the weather quite welcoming. While there is rainfall ranging from 1.38" (35mm) to 1.93" (49mm), the days of rainfall are more evenly distributed between 11.8 to 15.1 days in a month. Furthermore, the longer daylight durations of 14.4 hours to 14.9 hours provide ample opportunity to enjoy outdoor activities.

Autumn weather in Castle Rock

The autumn months in Castle Rock present a gradual decrease in temperature from 75.6°F (24.2°C) to a cooler 39.6°F (4.2°C) by December. There is a corresponding drop in rainfall from 1.14" (29mm) in August to 0.55" (14mm) in December, with humidity levels fluctuating between 45% and 62%.

Winter weather in Castle Rock

Winter in Castle Rock brings colder temperatures ranging from 20.1°F (-6.6°C) to 40.1°F (4.5°C) and higher levels of snowfall reaching up to 7.13" (181mm) in April. The number of sunshine hours reduce to 7 hours per day, and cloud coverage is at a maximum of 27%. Despite the cold, the relative humidity remains steady at around 62-65% making the winter air feel a bit drier than other seasons.

Weather in January

The month of January in Castle Rock, Colorado, is the start of winter with temperatures reaching a high of 40.1°F (4.5°C) and a low of 20.8°F (-6.2°C). This month is well-known for its persisting chilly vibe but less extreme than the following month. Weather in January »

Weather in February

The winter intensifies in February as compared to January, bringing more snow with 6.77" (172mm) seen throughout this month. This month is chiefly noted for its frequent snowfall leading to spectacular winter sceneries around Castle Rock. Weather in February »

Weather in March

In March, Castle Rock shifts into spring with its warming trend. There's an upswing in temperatures and a decrease in snowfall compared to February, creating the ideal conditions for the snow to start melting. The city experiences increased rainfall during this period. Weather in March »

Weather in April

Spring is in full swing in Castle Rock during the month of April. Sunshine increases, and the temperatures peak at 56.8°F (13.8°C), a marked difference from the previous month. Despite the warmer temperatures, residents and visitors can still experience some remaining chill, especially during the early morning and late evening hours. Weather in April »

Weather in May

May in Castle Rock is marked by warming temperatures and a distinct burst of color as the city is in full bloom. Rainfall registers at a high 2.24" (57mm) compared to the previous months. Activities usually start to shift outdoors as locals and tourists take advantage of the comfortable climate. Weather in May »

Weather in June

As June arrives, Castle Rock begins the transition into summer with an increase in temperatures and longer daylight hours. Compared to May, rainfall decreases, favoring a variety of outdoor activities. The bountiful sunshine brings with it a happy and fun-filled atmosphere, making it a favorite time of year for many. Weather in June »

Weather in July

July in Castle Rock is the peak of summer, seeing temperatures reach the year’s highest record of 83.3°F (28.5°C). This makes July the hottest month, spurting a true summer vibe across town. People are seen flocking to pools, beaches, and shade-covered areas to escape the heat. Weather in July »

Weather in August

The month of August provides a respite from the intense heat of July with slightly lower temperatures in Castle Rock. This month retains its summer feel but with a gentle nod towards the approaching fall. There's still the joy of summer activities, although the slightly cooled down weather makes them more pleasant. Weather in August »

Weather in September

September marks the commencement of autumn in Castle Rock. Temperatures and daylight hours gradually decrease following the end of the summer months. Interestingly, in this month, snowfall is absent, giving an unobstructed view of the fall foliage. Weather in September »

Weather in October

October in Castle Rock is the quintessential autumn month with a further drop in temperatures. Returning snowfall, with about 4.65" (118mm) recorded, hints at the upcoming winter. The crisp air and vibrant fall colors make walks around town exceptionally scenic and enjoyable. Weather in October »

Weather in November

November continues the transition from autumn to winter in Castle Rock. The temperatures cool down further, and the frequency of the snowfall increases. As winter approaches, the trees shed their leaves, making way for the pristine white landscapes the city is renowned for in winter. Weather in November »

Weather in December

December in Castle Rock is the onset of the winter season with temperatures dropping to an average low of 20.1°F (-6.6°C). Compared to November, it’s a much colder month, characterized by the typical winter chills. Snowfall measures about 3.86" (98mm), turning the city into a winter wonderland. Weather in December »

Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the driest month in Castle Rock?

The months with the least rainfall are January and December Rain falls for 5.1 days and accumulates 0.55" (14mm) of rain.

How many days does it rain in Castle Rock?

Throughout the year, in Castle Rock, there are 107.3 rainfall days, and 13.7" (348mm) of precipitation is accumulated.

When does it snow in Castle Rock?

Months with snowfall are January through June, October through December.

How many days does it snow in Castle Rock?

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

What are the months with 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 in Castle Rock.

What is the most humid month in Castle Rock?

The most humid month in Castle Rock, Colorado, is February, with an average relative humidity of 66%.

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

February has the least sunshine of the year in Castle Rock, Colorado, with an average of 6.8h of sunshine.

When is Daylight Saving Time (DST) in Castle Rock?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.

When does it snow the most in Castle Rock?

The month with the most snowfall is April, when snow falls for 6.8 days and typically aggregates up to 7.13" (181mm) of snow.

What is the rainiest month in Castle Rock?

May is the month with the most rainfall. Rain falls for 14.8 days and accumulates 2.24" (57mm) of precipitation.

What is the least humid month in Castle Rock?

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

When are the longest days in Castle Rock?

The month with the longest days is June, with an average of 14h and 54min of daylight.

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

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

When is the highest UV index in Castle Rock?

The months with the highest UV index in Castle Rock, Colorado, are June and July, with an average maximum UV index of 6.

What part of the year is the hottest in Castle Rock?

The highest temperatures are recorded in July, with averages reaching a high of 83.3°F (28.5°C) and a low of 57.2°F (14°C).

When it does not snow in Castle Rock?

July through September are months without snowfall in Castle Rock.

What time of the year is the coldest in Castle Rock?

Castle Rock reaches its average lowest temperatures in December, measuring 39.6°F (4.2°C) at the peak and 20.1°F (-6.6°C) at the lowest.

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

The month with the shortest days in Castle Rock, Colorado, is December, with an average of 9h and 24min of daylight.

Average temperature
Castle Rock, CO

Average high temperature in January:
40.1°F
Average high temperature in February:
40.3°F
Average high temperature in March:
50.7°F
Average high temperature in April:
56.8°F
Average high temperature in May:
65.5°F
Average high temperature in June:
79.9°F

Average high temperature in July:
83.3°F
Average high temperature in August:
82°F
Average high temperature in September:
75.6°F
Average high temperature in October:
60.4°F
Average high temperature in November:
50.2°F
Average high temperature in December:
39.6°F

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).

Average low temperature in January:
20.8°F
Average low temperature in February:
20.7°F
Average low temperature in March:
28.8°F
Average low temperature in April:
33.3°F
Average low temperature in May:
41.2°F
Average low temperature in June:
52.9°F

Average low temperature in July:
57.2°F
Average low temperature in August:
56.5°F
Average low temperature in September:
50.7°F
Average low temperature in October:
37.8°F
Average low temperature in November:
28.2°F
Average low temperature in December:
20.1°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).

Average pressure
Castle Rock, CO

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

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).

Average humidity
Castle Rock, CO

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

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").

Average rainfall days
Castle Rock, CO

Average rainfall days in January:
5.1 days
Average rainfall days in February:
4.6 days
Average rainfall days in March:
8.4 days
Average rainfall days in April:
11.9 days
Average rainfall days in May:
14.8 days
Average rainfall days in June:
11.8 days

Average rainfall days in July:
15.1 days
Average rainfall days in August:
13.3 days
Average rainfall days in September:
8.6 days
Average rainfall days in October:
5.2 days
Average rainfall days in November:
3 days
Average rainfall days in December:
5.5 days

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).

Average snowfall
Castle Rock, CO

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

Average snowfall days
Castle Rock, CO

Average snowfall days in January:
7.6 days
Average snowfall days in February:
9.8 days
Average snowfall days in March:
7.9 days
Average snowfall days in April:
6.8 days
Average snowfall days in May:
1.8 days
Average snowfall days in June:
0.1 days

Average snowfall days in July:
0 days
Average snowfall days in August:
0 days
Average snowfall days in September:
0.1 days
Average snowfall days in October:
2.9 days
Average snowfall days in November:
5.6 days
Average snowfall days in December:
8.4 days

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

Average daylight / Average sunshine
Castle Rock, CO

Average daylight in January:
9h and 5min
Average daylight in February:
10h and 4min
Average daylight in March:
12h and 0min
Average daylight in April:
13h and 2min
Average daylight in May:
14h and 2min
Average daylight in June:
14h and 5min

Average daylight in July:
14h and 4min
Average daylight in August:
13h and 4min
Average daylight in September:
12h and 2min
Average daylight in October:
11h and 1min
Average daylight in November:
10h and 0min
Average daylight in December:
9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in January:
7h and 0min
Average sunshine in February:
6h and 5min
Average sunshine in March:
8h and 5min
Average sunshine in April:
10h and 4min
Average sunshine in May:
11h and 1min
Average sunshine in June:
11h and 5min

Average sunshine in July:
11h and 5min
Average sunshine in August:
11h and 5min
Average sunshine in September:
11h and 0min
Average sunshine in October:
7h and 3min
Average sunshine in November:
7h and 2min
Average sunshine in December:
7h and 0min

The months with the most sunshine are June, July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).

Average sunshine days
Castle Rock, CO

Average sunshine days in January:
21.5 days
Average sunshine days in February:
16.7 days
Average sunshine days in March:
16.3 days
Average sunshine days in April:
12.1 days
Average sunshine days in May:
12 days
Average sunshine days in June:
14.1 days

Average sunshine days in July:
10.6 days
Average sunshine days in August:
12.3 days
Average sunshine days in September:
17.5 days
Average sunshine days in October:
20.7 days
Average sunshine days in November:
22.8 days
Average sunshine days in December:
20.5 days

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

Average UV index
Castle Rock, CO

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

Average cloud cover
Castle Rock, CO

The month with the most cloud cover is April (Cloud cover 27).
The month with the least cloud cover is September (Cloud cover 15).

Average visibility
Castle Rock, CO

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

Climate and monthly weather forecastCastle Rock, CO

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