Climate and monthly weather forecastCastle Rock, CO
Climate and monthly weather forecast
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
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The months with the least rainfall are January and December Rain falls for 5.1 days and accumulates 0.55" (14mm) of rain.
Throughout the year, in Castle Rock, there are 107.3 rainfall days, and 13.7" (348mm) of precipitation is accumulated.
Months with snowfall are January through June, October through December.
Throughout the year, there are 51 snowfall days, and 40.43" (1027mm) of snow is accumulated.
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Castle Rock.
The most humid month in Castle Rock, Colorado, is February, with an average relative humidity of 66%.
February has the least sunshine of the year in Castle Rock, Colorado, with an average of 6.8h of sunshine.
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.
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.
May is the month with the most rainfall. Rain falls for 14.8 days and accumulates 2.24" (57mm) of precipitation.
The months with the lowest humidity are June and September, with an average relative humidity of 45%.
The month with the longest days is June, with an average of 14h and 54min of daylight.
The months with the most sunshine in Castle Rock are June through August, with an average of 11.8h of sunshine.
The months with the highest UV index in Castle Rock, Colorado, are June and July, with an average maximum UV index of 6.
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).
July through September are months without snowfall 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.
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
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).
Average pressure
Castle Rock, CO
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
29.99"Hg - Average pressure in April:
29.91"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
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
- Average wind speed in January:
7mph - Average wind speed in February:
7.2mph - Average wind speed in March:
7.6mph - Average wind speed in April:
7.9mph - Average wind speed in May:
7.1mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.5mph - Average wind speed in September:
6.5mph - Average wind speed in October:
7mph - Average wind speed in November:
7mph - Average wind speed in December:
6.8mph
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
- Average rainfall in January:
0.55" - Average rainfall in February:
0.83" - Average rainfall in March:
1.38" - Average rainfall in April:
1.57" - Average rainfall in May:
2.24" - Average rainfall in June:
1.38"
- Average rainfall in July:
1.93" - Average rainfall in August:
1.14" - Average rainfall in September:
0.67" - Average rainfall in October:
0.87" - Average rainfall in November:
0.59" - Average rainfall in December:
0.55"
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
- Average snowfall in January:
4.02" - Average snowfall in February:
6.77" - Average snowfall in March:
6.65" - Average snowfall in April:
7.13" - Average snowfall in May:
3.46" - Average snowfall in June:
0.31"
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 48min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 48min - Average sunshine in March:
8h and 54min - Average sunshine in April:
10h and 36min - Average sunshine in May:
11h and 6min - Average sunshine in June:
11h and 48min
- Average sunshine in July:
11h and 48min - Average sunshine in August:
11h and 48min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 30min - Average sunshine in November:
7h and 18min - 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).
