Weather in Glenn, IL
Glenn, Sunday, 11 October, 12:08
Clear. Feels like 72°. High 75°, low 54°.
Monthly outlook for Glenn, IL: average high 65.4°, average low 53.1°. That is 2.9° above the climate normal for October. Precipitation is expected on 4 days (about 2.9 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 12 October (85.2°), the coolest 17 October (36.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 65.7° | 61.3° | +2.5° |
| 21 October – 30 October | 64.9° | 57.6° | +4.1° |
| 31 October – 9 November | at normal | 53.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Summit (2 mi).
0
Glenn, Monday, 12 October
Overcast. High 85°, low 66°.
0
Glenn, Tuesday, 13 October
Light rain. High 82°, low 69°.
0.93Glenn, Wednesday, 14 October
Heavy rain. High 71°, low 59°.
1.42Glenn, Thursday, 15 October
Rain. High 59°, low 56°.
0.03Glenn, Friday, 16 October
Light rain. High 59°, low 49°.
0Glenn, Saturday, 17 October
Clear. High 45°, low 37°.
0
Glenn, Sunday, 18 October
Partly cloudy. High 53°, low 37°.
0
Glenn, Monday, 19 October
Mostly clear. High 61°, low 45°.
0Glenn, Tuesday, 20 October
Clear. High 67°, low 49°.
0Glenn, Wednesday, 21 October
Overcast. High 67°, low 54°.
0Glenn, Thursday, 22 October
Overcast. High 69°, low 56°.
0.11Glenn, Friday, 23 October
Light rain. High 64°, low 58°.
0Glenn, Saturday, 24 October
Overcast. High 65°, low 57°.
0.37Glenn, Sunday, 25 October
Rain. High 72°, low 55°.
0Glenn, Monday, 26 October
Overcast. High 52°, low 47°.
0.1
Glenn, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06Glenn, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Glenn, Thursday, 29 October
Climate normal for this date — 60-year average.
0.12Glenn, Friday, 30 October
Climate normal for this date — 60-year average.
0.13Glenn, Saturday, 31 October
Climate normal for this date — 60-year average.
0.18Glenn, Sunday, 1 November
Climate normal for this date — 60-year average.
0.12Glenn, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Glenn, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Glenn, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Glenn, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Glenn, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Glenn, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Glenn, Sunday, 8 November
Climate normal for this date — 60-year average.
0.13Glenn, Monday, 9 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 Glenn, 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 Glenn, 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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