Lanark
Illinois, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Lanark, IL

January, like December, is another subzero cold winter month in Lanark, Illinois, with average temperature ranging between min 7°F (-13.9°C) and max 28°F (-2.2°C). With an average high-temperature of 28°F (-2.2°C) and an average low-temperature of 7°F (-13.9°C), January is the coldest month. Weather in January »
The last month of the winter, February, is a wintry month in Lanark, Illinois, with average temperature fluctuating between 36°F (2.2°C) and 12°F (-11.1°C). In Lanark, the average high-temperature in February slightly increases, from a subzero cold 28°F (-2.2°C) in January, to a wintry 36°F (2.2°C). Weather in February »

March, the first month of the spring, in Lanark, is a chilly month, with average temperature ranging between max 46°F (7.8°C) and min 25°F (-3.9°C). In March, the average high-temperature increases, from a cold 36°F (2.2°C) in February, to a chilly 46°F (7.8°C). Weather in March »

April is a comfortable spring month in Lanark, Illinois, with average temperature fluctuating between 36°F (2.2°C) and 61°F (16.1°C). In Lanark, Illinois, the average high-temperature increases considerably, from a chilly 46°F (7.8°C) in March, to an enjoyable 61°F (16.1°C). Weather in April »

May, the last month of the spring, in Lanark, is a pleasant month, with average temperature varying between 72°F (22.2°C) and 46°F (7.8°C). In May, the average high-temperature rises, from an enjoyable 61°F (16.1°C) in April, to an agreeable 72°F (22.2°C). Weather in May »

The first month of the summer, June, is a warm month in Lanark, Illinois, with average temperature varying between 54°F (12.2°C) and 82°F (27.8°C). In Lanark, Illinois, the average high-temperature rises, from a pleasant 72°F (22.2°C) in May, to a moderately hot 82°F (27.8°C). Weather in June »

July, like June, in Lanark, Illinois, is a moderately hot summer month, with temperature in the range of an average high of 84°F (28.9°C) and an average low of 59°F (15°C). With an average high-temperature of 84°F (28.9°C) and an average low-temperature of 59°F (15°C), July is the warmest month. Weather in July »

August, the last month of the summer, in Lanark, is another warm month, with average temperature varying between 55°F (12.8°C) and 82°F (27.8°C). In Lanark, the average high-temperature is relatively the same as in July - a still warm 82°F (27.8°C). Weather in August »

September, the first month of the autumn, in Lanark, is still a warm month, with average temperature ranging between max 75°F (23.9°C) and min 46°F (7.8°C). In September, the average high-temperature marginally drops, from 82°F (27.8°C) in August, to a still warm 75°F (23.9°C). Weather in September »

October, the same as September, is another comfortable autumn month in Lanark, Illinois, with average temperature fluctuating between 36°F (2.2°C) and 64°F (17.8°C). In October, the average high-temperature decreases, from a moderately hot 75°F (23.9°C) in September, to an enjoyable 64°F (17.8°C). Weather in October »

November, the last month of the autumn, in Lanark, is also a frosty month, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 46°F (7.8°C). In November, the average high-temperature declines considerably, from an enjoyable 64°F (17.8°C) in October, to a frosty 46°F (7.8°C). Weather in November »

The first month of the winter, December, is also a wintry month in Lanark, Illinois, with average temperature varying between 34°F (1.1°C) and 14°F (-10°C). In Lanark, Illinois, the average high-temperature in December decreases, from a frosty 46°F (7.8°C) in November, to a wintry 34°F (1.1°C). Weather in December »

What is the coldest month in Lanark?

The coldest month in Lanark, Illinois, is January, with an average high-temperature of 28°F (-2.2°C) and an average low-temperature of 7°F (-13.9°C).

How much does it rain in Lanark?

During the entire year, Lanark aggregates up to 37.8" (960mm) of precipitation.

What is the driest month in Lanark?

The month with the least rainfall in Lanark is January when 1.4" (36.3mm) of precipitation is typically aggregated.

What is the rainiest month in Lanark?

The month with the most rainfall in Lanark, Illinois, is June when 4.8" (121.2mm) of precipitation is typically aggregated.

When are the longest days in Lanark?

June has the longest days of the year in Lanark, with an average of 15.2h of daylight.

What is the warmest month in Lanark?

With an average high-temperature of 84°F (28.9°C) and an average low-temperature of 59°F (15°C), July is the warmest month.

What is the month with the shortest days in Lanark?

With an average of 9.2h of daylight, December has the shortest days of the year.
Average rainfall - Lanark, IL
Average daylight - Lanark, IL

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).