Weather in Shannon, IL
Shannon, Saturday, 17 October, 10:18
Clear. Feels like 45°. High 52°, low 34°.
Monthly outlook for Shannon, IL: average high 63.4°, average low 46.3°. That is 3.8° above the climate normal for October. Precipitation is expected on 3 days (about 1.2 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 23 October (69°), the coolest 17 October (34.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 63.6° | 57.7° | +3.3° |
| 27 October – 5 November | 63° | 53.4° | +5.3° |
| 6 November – 15 November | at normal | 47.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Freeport (11 mi).
0Shannon, Sunday, 18 October
Clear. High 60°, low 40°.
0Shannon, Monday, 19 October
Clear. High 63°, low 41°.
0
Shannon, Tuesday, 20 October
Overcast. High 64°, low 43°.
0Shannon, Wednesday, 21 October
Clear. High 66°, low 46°.
0Shannon, Thursday, 22 October
Clear. High 68°, low 48°.
0
Shannon, Friday, 23 October
Partly cloudy. High 69°, low 51°.
0Shannon, Saturday, 24 October
Overcast. High 68°, low 56°.
0Shannon, Sunday, 25 October
Overcast. High 63°, low 48°.
0Shannon, Monday, 26 October
Clear. High 62°, low 43°.
0.03
Shannon, Tuesday, 27 October
Light rain. High 67°, low 54°.
0.49Shannon, Wednesday, 28 October
Rain. High 64°, low 59°.
0Shannon, Thursday, 29 October
Overcast. High 59°, low 44°.
0.56Shannon, Friday, 30 October
Rain. High 67°, low 49°.
0.16Shannon, Saturday, 31 October
Light rain. High 68°, low 46°.
0Shannon, Sunday, 1 November
Overcast. High 54°, low 39°.
0.13Shannon, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Shannon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Shannon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.1Shannon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.08
Shannon, Friday, 6 November
Climate normal for this date — 60-year average.
0.03
Shannon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05Shannon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Shannon, Monday, 9 November
Climate normal for this date — 60-year average.
0.09Shannon, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Shannon, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Shannon, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04Shannon, Friday, 13 November
Climate normal for this date — 60-year average.
0.06Shannon, Saturday, 14 November
Climate normal for this date — 60-year average.
0.07Shannon, Sunday, 15 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 Shannon, 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 Shannon, 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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