June weather forecast
Johnstown, CO

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Weather in June

June brings the joyous onset of summer in Johnstown with an appreciable rise in warmth. The month invites with high temperatures of up to 84°F (28.9°C) and a decrease in humidity down to 43%. Colorado's azure skies grace most of June’s lengthy days, making way for the most sunshine hours recorded each year. Whether it's a picnic in the park or a quiet reading under a tree, the overall pleasant weather caters to a variety of summer pursuits.

Temperature

June is characterized by a noticeable escalation in the average high-temperature, rising from an agreeable 69.1°F (20.6°C) in May to a moderately hot 84°F (28.9°C). In the month of June, Johnstown witnesses a marked temperature drop at night, averaging a low of 56.8°F (13.8°C).

Heat index

The heat index value during June is calculated to be 84.2°F (29°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an estimation of the warmth sensation when considering humidity levels. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.

Humidity

In Johnstown, the average relative humidity in June is 43%.

Rainfall

In Johnstown, in June, during 11.6 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in Johnstown, there are 107.4 rainfall days, and 11.3" (287mm) of precipitation is accumulated.

Snowfall

In Johnstown, Colorado, snow does not fall in June through September.

Daylight

With an average of 15h and 0min of daylight, June has the longest days of the year.
On the first day of June, sunrise is at 5:31 am and sunset at 8:23 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 8:33 pm MDT.

Sunshine

The month with the most sunshine in Johnstown is June, with an average of 11.9h of sunshine.

UV index

The months with the highest UV index in Johnstown, Colorado, are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 6 during June leads to these advisories:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in Johnstown in June?

The average high-temperature, in June, in Johnstown, is 84°F (28.9°C), while the average low-temperature is 56.8°F (13.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in June is calculated to be 84.2°F (29°C).

What is the average humidity in June in Johnstown?

The average relative humidity in June in Johnstown is 43%.

How much does it rain in Johnstown in June?

In Johnstown, Colorado, in June, during 11.6 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.

When it does not snow in Johnstown?

June through September are months without snowfall in Johnstown, Colorado.

Does it snow in Johnstown in June?

In June, in Johnstown, Colorado, it doesn't snow. May is the latest month when it typically snows.

When are the longest days in Johnstown?

June has the longest days of the year in Johnstown, with an average of 15h and 0min of daylight.

What is the average length of the day in June in Johnstown?

In June, the average day length in Johnstown, Colorado, is 15h and 0min.

What time are sunrise and sunset in June in Johnstown?

In June, on the first day of the month, sunrise is at 5:31 am and sunset at 8:23 pm. On the last day of the month, in Johnstown, Colorado, sunrise is at 5:33 am and sunset at 8:33 pm MDT.

What month has the most sunshine in Johnstown?

The month with the most sunshine in Johnstown is June, with an average of 11.9h of sunshine.

How many hours of sunshine does Johnstown have in June?

The average sunshine duration in June is 11.9h.

When is the highest UV index in Johnstown?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Johnstown, Colorado.

What is the UV index reading in June in Johnstown?

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

Average temperature in June
Johnstown, CO

Average temperature in June - Johnstown, CO
  • Average high temperature in June: 84°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is December (39.4°F).

  • Average low temperature in June: 56.8°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).

Average pressure in June
Johnstown, CO

Average pressure in June - Johnstown, CO
  • Average pressure in June: 29.89"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in June
Johnstown, CO

Average wind speed in June - Johnstown, CO
  • Average wind speed in June: 6.4mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is December (5.5mph).

Average humidity in June
Johnstown, CO

Average humidity in June - Johnstown, CO
  • Average humidity in June: 43%

The months with the highest relative humidity are January, February and December (63%).
The months with the lowest relative humidity are August and September (42%).

Average rainfall in June
Johnstown, CO

Average rainfall in June - Johnstown, CO
  • Average rainfall in June: 1.06"

The wettest month (with the highest rainfall) is May (2.13").
The driest months (with the least rainfall) are January and December (0.39").

Average rainfall days in June
Johnstown, CO

Average rainfall days in June - Johnstown, CO
  • Average rainfall days in June: 11.6 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is November (3.7 days).

Average snowfall in June
Johnstown, CO

Average snowfall in June - Johnstown, CO
  • Average snowfall in June: 0"

The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in June
Johnstown, CO

Average snowfall days in June - Johnstown, CO
  • Average snowfall days in June: 0 days

The month with the highest number of snowfall days is February (9.6 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in June /
Average sunshine in June
Johnstown, CO

Average daylight in June / Average sunshine in June - Johnstown, CO
  • Average daylight in June: 15h and 0min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in June: 11h and 5min

The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).

Average sunshine days in June
Johnstown, CO

Average sunshine days in June - Johnstown, CO
  • Average sunshine days in June: 12.3 days

The month with the most sunshine days is January (22.4 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in June
Johnstown, CO

Average UV index in June - Johnstown, CO
  • Average UV index in June: 6

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

Average cloud cover in June
Johnstown, CO

Average cloud cover in June - Johnstown, CO
  • Average cloud cover in June: 16

The month with the most cloud cover is April (Cloud cover 27).
The months with the least cloud cover are June and September (Cloud cover 16).

Average visibility in June
Johnstown, CO

Average visibility in June - Johnstown, 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).

Johnstown, Colorado, USA

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