Best Time to Drive: Maryville, IL to Chicago, IL

The best overall window to drive from Maryville, IL to Chicago, IL is June to September. June is especially comfortable, and 8 AM to 11 AM is usually the easiest departure window. The main things to watch are winter mix risk.

Best overall window

June to September

This stretch gives the steadiest mix of comfort, daylight, and lower weather friction.

Easiest departure pattern

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

Most challenging stretch

December

November is one of the harder months for this route because the weather friction stacks up faster.

Why This Route Scores Differently

You can usually do this in one long day, which makes daylight and storm timing more important than hotel planning.

The current best window is June to September, when the drive is more likely to feel steady end to end.

This score uses multiple NOAA sample points along the route instead of a single state-wide climate average.

Month-by-Month Driving Conditions

Jan

Fair 17°F

Feb

Fair 19°F

Mar

Fair 26°F

Apr

Fair 33°F

May

Fair 40°F

Jun

Great 46°F

Jul

Great 50°F

Aug

Great 49°F

Sep

Good 44°F

Oct

Fair 36°F

Nov

Challenging 28°F

Dec

Challenging 20°F

Best Good/Fair Challenging

Average Conditions by Month

January

Avg high / low 21 / 13°F

Moisture 1.3 in rain

Rating Fair

Best departure

9 AM to 12 PM

Winter mix risk

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

February

Avg high / low 24 / 15°F

Moisture 1.3 in rain

Rating Fair

Best departure

9 AM to 12 PM

Winter mix risk

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

March

Avg high / low 31 / 21°F

Moisture 1.7 in rain

Rating Fair

Best departure

9 AM to 12 PM

Winter mix risk

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

April

Avg high / low 38 / 27°F

Moisture 2.5 in rain

Rating Fair

Best departure

9 AM to 12 PM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

May

Avg high / low 45 / 34°F

Moisture 3.1 in rain

Rating Fair

Best departure

9 AM to 12 PM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

June

Avg high / low 52 / 40°F

Moisture 2.9 in rain

Rating Great

Best departure

8 AM to 11 AM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

July

Avg high / low 55 / 45°F

Moisture 2.6 in rain

Rating Great

Best departure

8 AM to 11 AM

Holiday traffic

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

August

Avg high / low 54 / 44°F

Moisture 2.5 in rain

Rating Great

Best departure

8 AM to 11 AM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

September

Avg high / low 50 / 39°F

Moisture 2.4 in rain

Rating Good

Best departure

8 AM to 11 AM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

October

Avg high / low 41 / 31°F

Moisture 2.2 in rain

Rating Fair

Best departure

9 AM to 12 PM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

November

Avg high / low 32 / 24°F

Moisture 1.8 in rain

Rating Challenging

Best departure

9 AM to 12 PM

Holiday traffic

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

December

Avg high / low 24 / 17°F

Moisture 1.5 in rain

Rating Challenging

Best departure

9 AM to 12 PM

Winter mix risk Holiday traffic

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

Seasonal Hazards on This Route

Winter mix risk

Jan - Dec

Even light snow or freezing precipitation can matter more than usual when this route turns into a same-day commitment.

Best Departure Time by Season

Spring

9 AM to 12 PM

Waiting for a little daylight and warmer pavement usually makes the drive easier.

Summer

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

Fall

9 AM to 12 PM

Waiting for a little daylight and warmer pavement usually makes the drive easier.

Winter

9 AM to 12 PM

Waiting for a little daylight and warmer pavement usually makes the drive easier.

How This Score Was Built

Source

Route-sampled NOAA climate normals

High confidence. Built from 3 NOAA-backed route checkpoints rather than a single statewide estimate.

Origin zone

Midwest

Destination zone

Midwest

Route sample points

Late route

Late route checkpoint

IL statewide fallback (0 mi away)

Late route

Late route checkpoint

IL HEYWORTH 0.6 E (8.5 mi away)

Destination

Chicago, IL

IL CHICAGO NORTHERLY IS (2.1 mi away)

Ready to plan? See the full trip plan from Maryville, IL to Chicago, IL with stops, fuel costs, and directions.

Considering flying instead? Compare driving vs flying for this route.