Weather in Prospect Heights, IL
Prospect Heights, Tuesday, 20 October, 06:45
Clear. Feels like 47°. High 70°, low 43°.
Monthly outlook for Prospect Heights, IL: average high 58.5°, average low 42.6°. That is 1.3° above the climate normal for October. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 21 October (71.9°), the coolest 28 October (30.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 62.2° | 57.1° | +2.8° |
| 30 October – 8 November | 52.2° | 53.2° | -0.5° |
| 9 November – 18 November | at normal | 47.7° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Park Ridge (8 mi).
0
Prospect Heights, Wednesday, 21 October
Clear. High 72°, low 44°.
0
Prospect Heights, Thursday, 22 October
Mostly clear. High 68°, low 49°.
0Prospect Heights, Friday, 23 October
Clear. High 65°, low 50°.
0Prospect Heights, Saturday, 24 October
Clear. High 65°, low 46°.
0
Prospect Heights, Sunday, 25 October
Overcast. High 69°, low 53°.
0.32
Prospect Heights, Monday, 26 October
Rain. High 69°, low 48°.
0Prospect Heights, Tuesday, 27 October
Light rain. High 51°, low 38°.
0Prospect Heights, Wednesday, 28 October
Clear. High 42°, low 31°.
0Prospect Heights, Thursday, 29 October
Clear. High 51°, low 34°.
0Prospect Heights, Friday, 30 October
Overcast. High 53°, low 43°.
0Prospect Heights, Saturday, 31 October
Clear. High 53°, low 42°.
0Prospect Heights, Sunday, 1 November
Overcast. High 50°, low 39°.
0
Prospect Heights, Monday, 2 November
Partly cloudy. High 50°, low 40°.
0Prospect Heights, Tuesday, 3 November
Clear. High 54°, low 40°.
0Prospect Heights, Wednesday, 4 November
Overcast. High 54°, low 43°.
0.13
Prospect Heights, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Prospect Heights, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Prospect Heights, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05Prospect Heights, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Prospect Heights, Monday, 9 November
Climate normal for this date — 60-year average.
0.11Prospect Heights, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Prospect Heights, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Prospect Heights, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Prospect Heights, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Prospect Heights, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Prospect Heights, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Prospect Heights, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Prospect Heights, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.13Prospect Heights, Wednesday, 18 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 Prospect Heights, 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 Prospect Heights, 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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