June weather forecast
Castle Rock, CO

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

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. The city's charm is intensified by vibrant green landscapes bathed in sunlight. The cooling breeze carries a hint of upcoming summer, presenting an excellent weather retreat for residents and visitors.

Temperature

The start of June is characterized by a significant increase in the average high-temperature, moving from a refreshing 65.5°F (18.6°C) in May to a moderately hot 79.9°F (26.6°C). June nights see a notable contrast from daytime highs, with the nighttime temperature averaging at a fresh 52.9°F (11.6°C).

Humidity

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

Rainfall

In Castle Rock, Colorado, in June, it is raining for 11.8 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Castle Rock, there are 107.3 rainfall days, and 13.7" (348mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, October through December. June is the last month it regularly snows in Castle Rock. During 0.1 snowfall days, in June, Castle Rock aggregates 0.31" (8mm) of snow. In Castle Rock, Colorado, during the entire year, snow falls for 51 days and aggregates up to 40.43" (1027mm) of snow.

Daylight

June has the longest days of the year, with an average of 14h and 54min of daylight.
On the first day of June, sunrise is at 5:34 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:30 pm MDT.

Sunshine

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

UV index

June and July, with an average maximum UV index of 6, are months with the highest UV index in Castle Rock. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In June, the UV index of 6 transforms into the following advice:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average June temperature in Castle Rock?

An average high-temperature, in June, in Castle Rock, is 79.9°F (26.6°C) and the average low-temperature is 52.9°F (11.6°C).

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%.

What is the average humidity in June in Castle Rock?

In June, the average relative humidity in Castle Rock is 45%.

How much does it rain in Castle Rock in June?

In Castle Rock, during June, the rain falls for 11.8 days and regularly aggregates up to 1.38" (35mm) of precipitation.

What is the last month it snows in Castle Rock?

June is the last month it regularly snows in Castle Rock. During 0.1 snowfall days, in June, Castle Rock aggregates 0.31" (8mm) of snow.

When are the longest days in Castle Rock?

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

How many hours of daylight does Castle Rock have in June?

The average day length in June is 14h and 54min.

When is the sunrise / sunset in June in Castle Rock?

In June, on the first day of the month, sunrise is at 5:34 am and sunset at 8:20 pm. On the last day of the month, in Castle Rock, sunrise is at 5:36 am and sunset at 8:30 pm MDT.

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

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

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

In June, the average sunshine duration in Castle Rock is 11.8h.

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 is the UV index reading in June in Castle Rock?

In Castle Rock, Colorado, the average daily maximum UV index in June is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in June
Castle Rock, CO

Average temperature in June - Castle Rock, CO
  • Average high temperature in June: 79.9°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 June: 52.9°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 in June
Castle Rock, CO

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

Average wind speed in June - Castle Rock, CO
  • Average wind speed in June: 7.1mph

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 in June
Castle Rock, CO

Average humidity in June - Castle Rock, CO
  • Average humidity in June: 45%

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

Average rainfall in June
Castle Rock, CO

Average rainfall in June - Castle Rock, CO
  • Average rainfall in June: 1.38"

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 in June
Castle Rock, CO

Average rainfall days in June - Castle Rock, CO
  • Average rainfall days in June: 11.8 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 in June
Castle Rock, CO

Average snowfall in June - Castle Rock, CO
  • 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 in June
Castle Rock, CO

Average snowfall days in June - Castle Rock, CO
  • Average snowfall days in June: 0.1 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 in June /
Average sunshine in June
Castle Rock, CO

Average daylight in June / Average sunshine in June - Castle Rock, CO
  • Average daylight in June: 14h and 5min

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 June: 11h and 5min

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 in June
Castle Rock, CO

Average sunshine days in June - Castle Rock, CO
  • Average sunshine days in June: 14.1 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).

Average UV index in June
Castle Rock, CO

Average UV index in June - Castle Rock, CO
  • Average UV index in June: 6

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 in June
Castle Rock, CO

Average cloud cover in June - Castle Rock, CO
  • Average cloud cover in June: 16

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 in June
Castle Rock, CO

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

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).

Castle Rock, Colorado, USA

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