Weather in McLean, IL
McLean, Saturday, 10 October, 18:03
Overcast. Feels like 73°. High 79°, low 57°.
Monthly outlook for McLean, IL: average high 65°, average low 47.2°. That is 1.1° above the climate normal for October. Precipitation is expected on 2 days (about 1.5 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 13 October (85.3°), the coolest 18 October (27.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 66.6° | 64° | +1.5° |
| 20 October – 29 October | 62.4° | 60.1° | +1.3° |
| 30 October – 8 November | at normal | 56° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Shirley (9 mi).
0
McLean, Sunday, 11 October
Clear. High 82°, low 52°.
0McLean, Monday, 12 October
Clear. High 85°, low 59°.
0
McLean, Tuesday, 13 October
Mostly clear. High 85°, low 69°.
0.09
McLean, Wednesday, 14 October
Light rain. High 77°, low 66°.
1.38McLean, Thursday, 15 October
Rain. High 61°, low 57°.
0.01McLean, Friday, 16 October
Light rain. High 57°, low 42°.
0
McLean, Saturday, 17 October
Light snow. High 40°, low 33°.
0McLean, Sunday, 18 October
Clear. High 47°, low 28°.
0McLean, Monday, 19 October
Overcast. High 53°, low 31°.
0McLean, Tuesday, 20 October
Clear. High 62°, low 37°.
0McLean, Wednesday, 21 October
Clear. High 68°, low 43°.
0McLean, Thursday, 22 October
Overcast. High 70°, low 48°.
0.01McLean, Friday, 23 October
Light rain. High 52°, low 45°.
0.02McLean, Saturday, 24 October
Light rain. High 58°, low 45°.
0McLean, Sunday, 25 October
Clear. High 64°, low 45°.
0.14
McLean, Monday, 26 October
Climate normal for this date — 60-year average.
0.09McLean, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06McLean, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.08McLean, Thursday, 29 October
Climate normal for this date — 60-year average.
0.11McLean, Friday, 30 October
Climate normal for this date — 60-year average.
0.17
McLean, Saturday, 31 October
Climate normal for this date — 60-year average.
0.19McLean, Sunday, 1 November
Climate normal for this date — 60-year average.
0.08McLean, Monday, 2 November
Climate normal for this date — 60-year average.
0.09McLean, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09McLean, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.13McLean, Thursday, 5 November
Climate normal for this date — 60-year average.
0.08McLean, Friday, 6 November
Climate normal for this date — 60-year average.
0.06McLean, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04McLean, Sunday, 8 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for McLean, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in McLean, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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