Weather in Potomac, IL
Potomac, Saturday, 10 October, 15:58
Overcast. Feels like 77°. High 77°, low 55°.
Monthly outlook for Potomac, IL: average high 64.1°, average low 46.6°. That is 0.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.4 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 12 October (84.7°), the coolest 18 October (30.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 66° | 64.1° | +1.1° |
| 20 October – 29 October | 60.9° | 60.2° | +0.4° |
| 30 October – 8 November | at normal | 56.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Pence (15 mi).
0
Potomac, Sunday, 11 October
Clear. High 78°, low 53°.
0Potomac, Monday, 12 October
Overcast. High 85°, low 54°.
0Potomac, Tuesday, 13 October
Clear. High 85°, low 68°.
0.28
Potomac, Wednesday, 14 October
Rain. High 77°, low 62°.
0.97Potomac, Thursday, 15 October
Rain. High 62°, low 56°.
0.07Potomac, Friday, 16 October
Light rain. High 59°, low 44°.
0
Potomac, Saturday, 17 October
Light snow. High 39°, low 33°.
0
Potomac, Sunday, 18 October
Partly cloudy. High 46°, low 30°.
0Potomac, Monday, 19 October
Overcast. High 52°, low 31°.
0Potomac, Tuesday, 20 October
Clear. High 60°, low 35°.
0Potomac, Wednesday, 21 October
Clear. High 66°, low 41°.
0Potomac, Thursday, 22 October
Overcast. High 68°, low 46°.
0.01Potomac, Friday, 23 October
Light rain. High 55°, low 45°.
0.11Potomac, Saturday, 24 October
Light rain. High 56°, low 43°.
0Potomac, Sunday, 25 October
Overcast. High 61°, low 48°.
0.11
Potomac, Monday, 26 October
Climate normal for this date — 60-year average.
0.07Potomac, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.07Potomac, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Potomac, Thursday, 29 October
Climate normal for this date — 60-year average.
0.07Potomac, Friday, 30 October
Climate normal for this date — 60-year average.
0.14Potomac, Saturday, 31 October
Climate normal for this date — 60-year average.
0.17Potomac, Sunday, 1 November
Climate normal for this date — 60-year average.
0.13Potomac, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Potomac, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.07Potomac, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.11Potomac, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Potomac, Friday, 6 November
Climate normal for this date — 60-year average.
0.09Potomac, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Potomac, Sunday, 8 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 Potomac, 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 Potomac, 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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