Weather in McLean, IL
McLean, Thursday, 8 October, 22:34
Partly cloudy. Feels like 56°. High 78°, low 49°.
Monthly outlook for McLean, IL: average high 70.4°, average low 52.3°. That is 3.6° above the climate normal for October. Precipitation is expected on 2 days (about 0.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 15 October (88.3°), the coolest 18 October (38.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 October – 17 October | 76.5° | 65.4° | +6.2° |
| 18 October – 27 October | 60.2° | 60.6° | -0.2° |
| 28 October – 6 November | at normal | 56.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Shirley (9 mi).
0.03
McLean, Friday, 9 October
Light rain. High 81°, low 55°.
0
McLean, Saturday, 10 October
Overcast. High 83°, low 58°.
0
McLean, Sunday, 11 October
Clear. High 74°, low 57°.
0McLean, Monday, 12 October
Clear. High 86°, low 60°.
0McLean, Tuesday, 13 October
Clear. High 82°, low 68°.
0.11McLean, Wednesday, 14 October
Light rain. High 70°, low 61°.
0.47McLean, Thursday, 15 October
Rain. High 88°, low 64°.
0.01McLean, Friday, 16 October
Light rain. High 70°, low 52°.
0McLean, Saturday, 17 October
Clear. High 52°, low 42°.
0McLean, Sunday, 18 October
Overcast. High 55°, low 39°.
0McLean, Monday, 19 October
Overcast. High 56°, low 40°.
0McLean, Tuesday, 20 October
Overcast. High 53°, low 46°.
0McLean, Wednesday, 21 October
Clear. High 69°, low 46°.
0McLean, Thursday, 22 October
Clear. High 68°, low 52°.
0
McLean, Friday, 23 October
Mostly clear. High 60°, low 47°.
0.12
McLean, Saturday, 24 October
Climate normal for this date — 60-year average.
0.14McLean, 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.
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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