Weather in McLean, IL
McLean, Friday, 9 October, 23:27
Clear. Feels like 61°. High 80°, low 54°.
Monthly outlook for McLean, IL: average high 68.2°, average low 51.7°. That is 2.6° above the climate normal for October. Precipitation is expected on 3 days (about 0.9 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 12 October (86.2°), the coolest 18 October (31.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 71.3° | 64.7° | +3.7° |
| 19 October – 28 October | 63.1° | 60.3° | +1.6° |
| 29 October – 7 November | at normal | 56.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Shirley (9 mi).
0
McLean, Saturday, 10 October
Overcast. High 79°, low 58°.
0
McLean, Sunday, 11 October
Clear. High 78°, low 54°.
0McLean, Monday, 12 October
Clear. High 86°, low 63°.
0McLean, Tuesday, 13 October
Clear. High 84°, low 71°.
0.19
McLean, Wednesday, 14 October
Rain. High 69°, low 61°.
0.06McLean, Thursday, 15 October
Light rain. High 70°, low 55°.
0.01McLean, Friday, 16 October
Light rain. High 65°, low 48°.
0McLean, Saturday, 17 October
Light rain. High 47°, low 37°.
0McLean, Sunday, 18 October
Clear. High 53°, low 32°.
0
McLean, Monday, 19 October
Mostly clear. High 60°, low 38°.
0McLean, Tuesday, 20 October
Overcast. High 67°, low 48°.
0.04McLean, Wednesday, 21 October
Light rain. High 64°, low 52°.
0.64McLean, Thursday, 22 October
Rain. High 62°, low 56°.
0McLean, Friday, 23 October
Overcast. High 67°, low 55°.
0McLean, Saturday, 24 October
Overcast. High 58°, low 46°.
0.14
McLean, Sunday, 25 October
Climate normal for this date — 60-year average.
0.14McLean, 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.
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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