April 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 April

April in Castle Rock, Colorado, is a moderate spring month, with average temperature varying between 33.3°F (0.7°C) and 56.8°F (13.8°C).

Temperature

In April, the average high-temperature marginally rises, from a fresh 50.7°F (10.4°C) in March, to a mild 56.8°F (13.8°C). In Castle Rock, the average low-temperature is 33.3°F (0.7°C).

Humidity

In April, the average relative humidity is 53%.

Rainfall

In Castle Rock, Colorado, it is raining for 11.9 days, with typically 1.57" (40mm) of accumulated precipitation. In Castle Rock, during the entire year, the rain falls for 107.3 days and collects up to 13.7" (348mm) of precipitation.

Snowfall

Months with snowfall are January through June, October through December. April is the month with the most snowfall. Snow falls for 6.8 days and accumulates 7.13" (181mm) of snow.

Daylight

In April, the average length of the day is 13.3h.

Sunshine

The average sunshine in April is 10.6h.

UV index

The average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for the average person.
Note: In April, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in April in Castle Rock?

In April, in Castle Rock, Colorado, the average high-temperature is 56.8°F (13.8°C), and the average low-temperature is 33.3°F (0.7°C).

What is the average humidity in April in Castle Rock?

In April, the average relative humidity is 53%.

How many days does it rain in April in Castle Rock?

In Castle Rock, Colorado, in April, during 11.9 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

How much does it snow in Castle Rock in April?

In April, in Castle Rock, Colorado, it is snowing for 6.8 days. Throughout April, 7.13" (181mm) of snow is accumulated.

When does it snow the most 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 average length of the day in April in Castle Rock?

The average length of the day in April is 13.3h.

How long on average sun shines in April in Castle Rock?

In Castle Rock, the average sunshine in April is 10.6h.

What is the UV index reading in April in Castle Rock?

In Castle Rock, Colorado, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in April
Castle Rock, CO

Average temperature in April - Castle Rock, CO
  • Average high temperature in April: 56.8°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 April: 33.3°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 in April
Castle Rock, CO

Average pressure in April - Castle Rock, CO
  • Average pressure in April: 29.91"

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 in April
Castle Rock, CO

Average wind speed in April - Castle Rock, CO
  • Average wind speed in April: 7.9mph

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 in April
Castle Rock, CO

Average humidity in April - Castle Rock, CO
  • Average humidity in April: 53%

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 in April
Castle Rock, CO

Average rainfall in April - Castle Rock, CO
  • Average rainfall in April: 1.57"

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 in April
Castle Rock, CO

Average rainfall days in April - Castle Rock, CO
  • Average rainfall days in April: 11.9 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).

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Average snowfall in April
Castle Rock, CO

Average snowfall in April - Castle Rock, CO
  • Average snowfall in April: 7.13"

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 in April
Castle Rock, CO

Average snowfall days in April - Castle Rock, CO
  • Average snowfall days in April: 6.8 days

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 in April /
Average sunshine in April
Castle Rock, CO

Average daylight in April / Average sunshine in April - Castle Rock, CO
  • Average daylight in April: 13.3h

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

  • Average sunshine in April: 10.6h

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 in April
Castle Rock, CO

Average sunshine days in April - Castle Rock, CO
  • Average sunshine days in April: 12.1 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).

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Average UV index in April
Castle Rock, CO

Average UV index in April - Castle Rock, CO
  • Average UV index in April: 3

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 cloud cover in April
Castle Rock, CO

Average cloud cover in April - Castle Rock, CO
  • Average cloud cover in April: 27

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

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Average visibility in April
Castle Rock, CO

Average visibility in April - Castle Rock, CO
  • Average visibility in April: 6mi

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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