July weather forecast
Mercersburg, PA

Weather in July

July, like June, in Mercersburg, Pennsylvania, is another warm summer month, with an average temperature fluctuating between 84.7°F (29.3°C) and 62.6°F (17°C).

Temperature

With an average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 62.6°F (17°C), July is the warmest month.

Heat index

The average heat index in July is calculated to be a hot 93.9°F (34.4°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, clothing, differences in body mass, height, and shape), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The months with the lowest humidity are April and July, with an average relative humidity of 75%.

Rainfall

In Mercersburg, during July, the rain falls for 17.8 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, there are 170.5 rainfall days, and 31.02" (788mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Mercersburg.

Daylight

In Mercersburg, the average length of the day in July is 14h and 40min.
On the first day of July, sunrise is at 5:47 am and sunset at 8:43 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 8:26 pm EDT.

Sunshine

The month with the most sunshine in Mercersburg, Pennsylvania, is July, with an average of 10.5h of sunshine.

UV index

The months with the highest UV index in Mercersburg are May through July, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 6 in July interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
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FAQ

What is the warmest month in Mercersburg?

July is the warmest month in Mercersburg, Pennsylvania, with an average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 62.6°F (17°C).

What is the temperature in July in Mercersburg?

The average high-temperature, in July, in Mercersburg, is 84.7°F (29.3°C), while the average low-temperature is 62.6°F (17°C). In July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is calculated to be 93.9°F (34.4°C).

What are the least humid months in Mercersburg?

April and July, with an average relative humidity of 75%, are the least humid months.

What is the average humidity in July in Mercersburg?

The average relative humidity in July in Mercersburg, Pennsylvania, is 75%.

How much does it rain in Mercersburg in July?

In July, in Mercersburg, Pennsylvania, the rain falls for 17.8 days. Throughout July, 3.03" (77mm) of precipitation is accumulated.

When it does not snow in Mercersburg?

In Mercersburg, snow does not fall in May through September.

How many hours of daylight does Mercersburg have in July?

In July, the average day length in Mercersburg is 14h and 40min.

When is the sunrise / sunset in July in Mercersburg?

In July, on the first day of the month, sunrise is at 5:47 am and sunset at 8:43 pm. On the last day of the month, in Mercersburg, Pennsylvania, sunrise is at 6:09 am and sunset at 8:26 pm EDT.

What month has the most sunshine in Mercersburg?

July has the most sunshine of the year in Mercersburg, with an average of 10.5h of sunshine.

How long on average sun shines in July in Mercersburg?

In July, the average sunshine duration in Mercersburg, Pennsylvania, is 10.5h.

What is the month with the highest UV index in Mercersburg?

The months with the highest UV index in Mercersburg, Pennsylvania, are May through July, with an average maximum UV index of 6.

What is the UV index intensity in July in Mercersburg?

In Mercersburg, Pennsylvania, the average daily maximum UV index in July is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.

Average temperature in July
Mercersburg, PA

Average temperature in July - Mercersburg, PA
  • Average high temperature in July: 84.7°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in July: 62.6°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

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Average pressure in July
Mercersburg, PA

Average pressure in July - Mercersburg, PA
  • Average pressure in July: 29.98"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in July
Mercersburg, PA

Average wind speed in July - Mercersburg, PA
  • Average wind speed in July: 4.4mph

The windiest month (with the highest average wind speed) is January (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

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Average humidity in July
Mercersburg, PA

Average humidity in July - Mercersburg, PA
  • Average humidity in July: 75%

The months with the highest relative humidity are February, May, October and December (79%).
The months with the lowest relative humidity are April and July (75%).

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Average rainfall in July
Mercersburg, PA

Average rainfall in July - Mercersburg, PA
  • Average rainfall in July: 3.03"

The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (2.05").

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Average rainfall days in July
Mercersburg, PA

Average rainfall days in July - Mercersburg, PA
  • Average rainfall days in July: 17.8 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is November (9.9 days).

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Average snowfall in July
Mercersburg, PA

Average snowfall in July - Mercersburg, PA
  • Average snowfall in July: 0"

The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in July
Mercersburg, PA

Average snowfall days in July - Mercersburg, PA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in July /
Average sunshine in July
Mercersburg, PA

Average daylight in July / Average sunshine in July - Mercersburg, PA
  • Average daylight in July: 14h and 40min

The month with the longest days is June (Average daylight: 14h and 57min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in July: 10.5h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 4.6h).

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Average sunshine days in July
Mercersburg, PA

Average sunshine days in July - Mercersburg, PA
  • Average sunshine days in July: 11.5 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (10.3 days).

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Average UV index in July
Mercersburg, PA

Average UV index in July - Mercersburg, PA
  • Average UV index in July: 6

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

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Average cloud cover in July
Mercersburg, PA

Average cloud cover in July - Mercersburg, PA
  • Average cloud cover in July: 31

The months with the most cloud cover are January, February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in July
Mercersburg, PA

Average visibility in July - Mercersburg, PA
  • Average visibility in July: 6mi

The months with the highest visibility are April, June, July and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September, October and December (5mi).

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