McLean, Illinois, United States of America: What to pack, what to wear, and when to go [2021]

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Traveling to McLean, Illinois, United States of America? If you're planning to go to McLean, this is some important information about when to go, what to wear, and what to pack.

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When to go to McLean, Illinois, United States of America

Based on the climate and weather in McLean, the best time to go is September. See below for details.

Important esssentials for McLean, Illinois, United States of America

Here are some general tips on what to wear in McLean, as well as several items to remember to pack when traveling there.

What to wear/what to pack for McLean, Illinois, United States of America by month

January

January in McLean is frigid. The rain/snow can amount to several inches/centimeters.

During this time, temperatures average in the 20s F (single digits below 0 C) to low 30s F (single digits C), although night temperatures can dip into the single digits F (10+ below zero C).

What to wear/what to pack:

February

February in McLean is pretty cool. The average overnight temperatures in the area are in the low 20s F (single digits below 0 C), with a few days below 0 F (10+ below zero C). It tends to rain a bit less than half of the time.

It also snows sometimes. But the colder weather doesn't bring low humidity, which is in the 60% to 70% range on average.

What to wear/what to pack:

March

March in McLean is pretty cool and somewhat rainy. The rain can amount to several inches/centimeters.

During this time, temperatures average in the low 40s F (single digits C) to low 50s F (low 10s C), although night temperatures can dip into the low 20s F (single digits below 0 C).

What to wear/what to pack:

April

April in McLean is crisp and somewhat rainy. The rain can amount to several inches/centimeters.

During this time, temperatures average in the low 60s F (high 10s C), although night temperatures can dip into the low 40s F (single digits C).

What to wear/what to pack:

May

May in McLean is warm and somewhat rainy. The rain can amount to several inches/centimeters.

During this time, temperatures average in the low 60s F (high 10s C) to low 70s F (low 20s C), although night temperatures can dip into the low 50s F (single digits C).

What to wear/what to pack:

June

If you go to McLean in June, you will notice that it is pretty consistently hot and somewhat rainy. Expect it to rain 5-10 days this month. Daytime temperatures are in the low 80s F (high 20s C).

What to wear/what to pack:

July

If you visit McLean during July, you may see that it is constantly hot. Temperatures tend to hover around the 80s F (low 20s C) during the day, while at night they can dip into the 60s F (high 10s C).

Humidity is generally between 50 and 60% during the day. In terms of precipitation, you can expect it to rain about a third of the time.

What to wear/what to pack:

August

If you are traveling to McLean in August, you will notice that it is pretty consistently hot. Expect it to rain about a third of the time. Daytime temperatures are in the 80s F (high 20s C).

What to wear/what to pack:

September

If you go to McLean in September, you will notice that it is warm. Expect it to rain 5-10 days this month. Daytime temperatures are in the high 70s F (mid 20s C).

What to wear/what to pack:

October

October in McLean is chilly. The average overnight temperatures in the area are in the 40s F (single digits C), with a few days below 32 F (single digits C).

It tends to rain a bit less than half of the time. With the colder weather comes lower humidity, which is in the 50% to 60% range on average.

What to wear/what to pack:

November

If you vacation in McLean during November, you may notice that it can be brisk. Temperatures tend to hover around the low 50s F (low 10s C) during the day, while at night they can dip into the low 30s F (single digits C).

Humidity is generally between 60 and 70% during the day. In terms of precipitation, you can expect it to rain 5-10 days this month.

What to wear/what to pack:

December

December is very cold and somewhat rainy. Temperatures average in the 30s F (single digits C) during the day. It rains regularly and snows once in a while.

What to wear/what to pack:

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