Weather in Mount Prospect, IL
Mount Prospect, Sunday, 18 October, 01:15
Clear. Feels like 39°. High 63°, low 44°.
Monthly outlook for Mount Prospect, IL: average high 64.2°, average low 50.4°. That is 4.1° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 24 October (71.5°), the coolest 26 October (42.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 63.8° | 57.8° | +3.3° |
| 28 October – 6 November | 64.9° | 54° | +6.1° |
| 7 November – 16 November | at normal | 48.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Park Ridge (6 mi).
0
Mount Prospect, Monday, 19 October
Clear. High 63°, low 44°.
0Mount Prospect, Tuesday, 20 October
Clear. High 63°, low 44°.
0Mount Prospect, Wednesday, 21 October
Clear. High 65°, low 45°.
0.01
Mount Prospect, Thursday, 22 October
Light rain. High 65°, low 48°.
0
Mount Prospect, Friday, 23 October
Mostly clear. High 68°, low 54°.
0
Mount Prospect, Saturday, 24 October
Overcast. High 72°, low 60°.
0Mount Prospect, Sunday, 25 October
Overcast. High 64°, low 48°.
0Mount Prospect, Monday, 26 October
Clear. High 56°, low 43°.
0Mount Prospect, Tuesday, 27 October
Overcast. High 58°, low 44°.
0Mount Prospect, Wednesday, 28 October
Overcast. High 61°, low 54°.
0.05Mount Prospect, Thursday, 29 October
Light rain. High 64°, low 61°.
0Mount Prospect, Friday, 30 October
Mostly clear. High 67°, low 57°.
0.1Mount Prospect, Saturday, 31 October
Light rain. High 66°, low 54°.
0.02Mount Prospect, Sunday, 1 November
Light rain. High 66°, low 56°.
0Mount Prospect, Monday, 2 November
Clear. High 66°, low 51°.
0.06
Mount Prospect, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Mount Prospect, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.13
Mount Prospect, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Mount Prospect, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Mount Prospect, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05Mount Prospect, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Mount Prospect, Monday, 9 November
Climate normal for this date — 60-year average.
0.11Mount Prospect, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Mount Prospect, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Mount Prospect, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Mount Prospect, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Mount Prospect, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Mount Prospect, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Mount Prospect, Monday, 16 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 Mount Prospect, 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 Mount Prospect, 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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