Best time to visit Alto Pass, IL

A month-by-month travel weather guide based on NOAA 30-year climate normals.

The most comfortable travel window in Alto Pass runs from September through October — 2 months of pleasant temperatures and modest rainfall.

January Cool
High
45.2°F
Low
25.4°F
Precip
3.53 in

Mild but on the chilly side. Pack a jacket; great for hiking and city walks.

Daylight ≈ 9h 41m

February Cool
High
50.0°F
Low
29.1°F
Precip
3.40 in

Mild but on the chilly side. Pack a jacket; great for hiking and city walks.

Daylight ≈ 10h 36m

March Cool
High
60.8°F
Low
37.0°F
Precip
4.82 in

Mild but on the chilly side. Pack a jacket; great for hiking and city walks.

Daylight ≈ 11h 45m

April Wet
High
71.4°F
Low
46.4°F
Precip
5.63 in

Frequent rain. Bring waterproof gear; outdoor plans need flexibility.

Daylight ≈ 12h 59m

May Wet
High
79.0°F
Low
56.1°F
Precip
5.93 in

Frequent rain. Bring waterproof gear; outdoor plans need flexibility.

Daylight ≈ 14h 1m

June Good
High
87.0°F
Low
64.7°F
Precip
4.95 in

Comfortable for most activities. Bring layers; nights can be cool.

Daylight ≈ 14h 33m

July Hot
High
89.7°F
Low
68.7°F
Precip
3.70 in

Summer heat. Avoid midday exertion; aim for morning and evening activities.

Daylight ≈ 14h 21m

August Hot
High
89.4°F
Low
67.0°F
Precip
3.15 in

Summer heat. Avoid midday exertion; aim for morning and evening activities.

Daylight ≈ 13h 27m

September Good
High
83.5°F
Low
59.2°F
Precip
3.49 in

Comfortable for most activities. Bring layers; nights can be cool.

Daylight ≈ 12h 14m

October Good
High
72.7°F
Low
47.5°F
Precip
3.89 in

Comfortable for most activities. Bring layers; nights can be cool.

Daylight ≈ 11h 0m

November Cool
High
59.0°F
Low
37.0°F
Precip
4.54 in

Mild but on the chilly side. Pack a jacket; great for hiking and city walks.

Daylight ≈ 9h 56m

December Cool
High
48.0°F
Low
29.7°F
Precip
4.10 in

Mild but on the chilly side. Pack a jacket; great for hiking and city walks.

Daylight ≈ 9h 25m

Looking for similar climates? See Alto Pass's climate twins. Or jump straight to the full climate profile.