July weather forecast
Lanark, IL

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Weather in July

July in Lanark, Illinois, retains the scorching effect of the summer season. With temperatures hitting a high of 79.9°F (26.6°C), July registers as the hottest month. The sun blazes in the sky for 14.9 hours, making it the second-longest day of the year. Amidst the summer glow, villagers experience precipitation of 2.05" (52mm), providing the much-needed relief to the dry environment. Needle, however, moves slightly down in the UV index, converging to an average of 6.

Temperature

Lanark's July weather, with an average high temperature of 79.9°F (26.6°C) and an average low temperature of 63.3°F (17.4°C), tends to be the warmest of the year.

Humidity

The average relative humidity in July is 85%.

Rainfall

In Lanark, in July, it is raining for 15.4 days, with typically 2.05" (52mm) of accumulated precipitation. In Lanark, during the entire year, the rain falls for 130.8 days and collects up to 17.95" (456mm) of precipitation.

Snowfall

In Lanark, Illinois, snow does not fall in May through September.

Daylight

The average length of the day in July in Lanark is 14h and 53min.
On the first day of the month, sunrise is at 5:27 am and sunset at 8:39 pm. On the last day of July, in Lanark, sunrise is at 5:52 am and sunset at 8:19 pm CDT.

Sunshine

July has the most sunshine of the year in Lanark, with an average of 9.8h of sunshine.

UV index

July is the month with the highest UV index, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 6 during July leads to these advisories:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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Frequently asked questions

What are the warmest months in Lanark?

The warmest temperatures in Lanark occur during July, when averages reach a peak of 79.9°F (26.6°C) and a low of 63.3°F (17.4°C).

What are July temperatures in Lanark?

In Lanark, 79.9°F (26.6°C) is the average high-temperature and 63.3°F (17.4°C) is the average low-temperature during July.

What is the average humidity in July in Lanark?

The average relative humidity in July in Lanark, Illinois, is 85%.

How much does it rain in Lanark in July?

In July, in Lanark, Illinois, the rain falls for 15.4 days. Throughout July, 2.05" (52mm) of precipitation is accumulated.

When it does not snow in Lanark?

In Lanark, Illinois, snow does not fall in May through September.

What is the average length of the day in July in Lanark?

In July, the average day length in Lanark is 14h and 53min.

When are sunrise and sunset in July in Lanark?

On the first day of July, sunrise is at 5:27 am and sunset at 8:39 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:19 pm CDT.

What month has the most sunshine in Lanark?

With an average of 9.8h of sunshine, July has the most sunshine of the year in Lanark.

How many hours of sunshine does Lanark have in July?

In Lanark, the average sunshine duration in July is 9.8h.

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

With an average maximum UV index of 6, July is the month with the highest UV index in Lanark, Illinois.

What is the UV index reading in July in Lanark?

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 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 July
Lanark, IL

Average temperature in July - Lanark, IL
  • Average high temperature in July: 79.9°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (25.9°F).

  • Average low temperature in July: 63.3°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in July
Lanark, IL

Average pressure in July - Lanark, IL
  • Average pressure in July: 29.96"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in July
Lanark, IL

Average wind speed in July - Lanark, IL
  • Average wind speed in July: 6.6mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average humidity in July
Lanark, IL

Average humidity in July - Lanark, IL
  • Average humidity in July: 85%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in July
Lanark, IL

Average rainfall in July - Lanark, IL
  • Average rainfall in July: 2.05"

The wettest month (with the highest rainfall) is May (2.76").
The driest months (with the least rainfall) are January and February (0.71").

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Average rainfall days in July
Lanark, IL

Average rainfall days in July - Lanark, IL
  • Average rainfall days in July: 15.4 days

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in July
Lanark, IL

Average snowfall in July - Lanark, IL
  • Average snowfall in July: 0"

The month with the highest snowfall is January (2.64").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in July
Lanark, IL

Average snowfall days in July - Lanark, IL
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (11.2 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
Lanark, IL

Average daylight in July / Average sunshine in July - Lanark, IL
  • Average daylight in July: 14h and 5min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in July: 9h and 5min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in July
Lanark, IL

Average sunshine days in July - Lanark, IL
  • Average sunshine days in July: 12.7 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (10 days).

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Average UV index in July
Lanark, IL

Average UV index in July - Lanark, IL
  • Average UV index in July: 6

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in July
Lanark, IL

Average cloud cover in July - Lanark, IL
  • Average cloud cover in July: 35

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 32).

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Average visibility in July
Lanark, IL

Average visibility in July - Lanark, IL
  • Average visibility in July: 5mi

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

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Lanark, Illinois, USA

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