July weather forecast
Johnstown, CA

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Weather in July

July, like June, in Johnstown, California, is another warm summer month, with an average temperature fluctuating between 63.1°F (17.3°C) and 83.7°F (28.7°C).

Temperature

Johnstown's entry into July measures an average high-temperature of a still warm 83.7°F (28.7°C), closely parallel to the preceding month. In Johnstown, the average nighttime temperature during July is a comfortable 63.1°F (17.3°C).

Heat index

July's mean heat index is calculated to be a hot 87.8°F (31°C). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.
Data suggests that the heat index is set for environments in shade and with a light wind. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.

Humidity

The average relative humidity in July in Johnstown is 60%.

Rainfall

In Johnstown, in July, during 5 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. In Johnstown, during the entire year, the rain falls for 49.6 days and collects up to 5.16" (131mm) of precipitation.

Daylight

In July, the average length of the day is 14h and 4min.
On the first day of July, sunrise is at 5:43 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 6:01 am and sunset at 7:46 pm PDT.

Sunshine

The months with the most sunshine in Johnstown are June and July, with an average of 12.1h of sunshine.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Johnstown. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 6 in July translates into these instructions:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
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Frequently asked questions

How hot is it in Johnstown in July?

An average high-temperature, in July, in Johnstown, is 83.7°F (28.7°C) and the average low-temperature is 63.1°F (17.3°C). In July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 87.8°F (31°C).

What is the average humidity in July in Johnstown?

The average relative humidity in July in Johnstown is 60%.

How many days does it rain in July in Johnstown?

In July, in Johnstown, the rain falls for 5 days. Throughout July, 0.35" (9mm) of precipitation is accumulated.

How many hours of daylight does Johnstown have in July?

The average day length in July in Johnstown, California, is 14h and 4min.

When is the sunrise / sunset in July in Johnstown?

On the first day of July in Johnstown, sunrise is at 5:43 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 6:01 am and sunset at 7:46 pm PDT.

What is the month with the most sunshine in Johnstown?

June and July, with an average of 12.1h of sunshine, are months with the most sunshine.

How long on average sun shines in July in Johnstown?

In Johnstown, California, the average sunshine duration in July is 12.1h.

When is the highest UV index in Johnstown?

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

How high is the UV index in July in Johnstown?

In Johnstown, the average daily maximum UV index in July is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Johnstown, CA

Average temperature in July - Johnstown, CA
  • Average high temperature in July: 83.7°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in July: 63.1°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46°F).

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Average pressure in July
Johnstown, CA

Average pressure in July - Johnstown, CA
  • Average pressure in July: 29.89"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in July
Johnstown, CA

Average wind speed in July - Johnstown, CA
  • Average wind speed in July: 4.5mph

The windiest months (with the highest average wind speed) are April and May (5.3mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.2mph).

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Average humidity in July
Johnstown, CA

Average humidity in July - Johnstown, CA
  • Average humidity in July: 60%

The month with the highest relative humidity is May (65%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in July
Johnstown, CA

Average rainfall in July - Johnstown, CA
  • Average rainfall in July: 0.35"

The wettest month (with the highest rainfall) is February (1.06").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in July
Johnstown, CA

Average rainfall days in July - Johnstown, CA
  • Average rainfall days in July: 5 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is June (1.4 days).

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Average daylight in July /
Average sunshine in July
Johnstown, CA

Average daylight in July / Average sunshine in July - Johnstown, CA
  • Average daylight in July: 14h and 1min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in July: 12h and 1min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in July
Johnstown, CA

Average sunshine days in July - Johnstown, CA
  • Average sunshine days in July: 20.7 days

The month with the most sunshine days is June (28 days).
The month with the least sunshine days is July (20.7 days).

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Average UV index in July
Johnstown, CA

Average UV index in July - Johnstown, CA
  • Average UV index in July: 6

The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in July
Johnstown, CA

Average cloud cover in July - Johnstown, CA
  • Average cloud cover in July: 8

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in July
Johnstown, CA

Average visibility in July - Johnstown, CA
  • Average visibility in July: 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).

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Johnstown, California, USA

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