Weather in Potomac, IL
Potomac, Sunday, 11 October, 01:39
Partly cloudy. Feels like 59°. High 78°, low 54°.
Monthly outlook for Potomac, IL: average high 65.2°, average low 46.6°. That is 1.5° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 12 October (85.5°), the coolest 18 October (31.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 66.2° | 63.6° | +1.4° |
| 21 October – 30 October | 63.5° | 60° | +1.9° |
| 31 October – 9 November | at normal | 55.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Pence (15 mi).
0
Potomac, Monday, 12 October
Clear. High 86°, low 55°.
0
Potomac, Tuesday, 13 October
Overcast. High 85°, low 68°.
0
Potomac, Wednesday, 14 October
Light rain. High 77°, low 62°.
0Potomac, Thursday, 15 October
Overcast. High 64°, low 53°.
0Potomac, Friday, 16 October
Overcast. High 59°, low 42°.
0.02
Potomac, Saturday, 17 October
Snow. High 45°, low 34°.
0
Potomac, Sunday, 18 October
Partly cloudy. High 49°, low 32°.
0Potomac, Monday, 19 October
Overcast. High 57°, low 35°.
0Potomac, Tuesday, 20 October
Clear. High 63°, low 40°.
0Potomac, Wednesday, 21 October
Overcast. High 68°, low 44°.
0Potomac, Thursday, 22 October
Clear. High 67°, low 49°.
0Potomac, Friday, 23 October
Clear. High 60°, low 45°.
0
Potomac, Saturday, 24 October
Mostly clear. High 58°, low 41°.
0.1Potomac, Sunday, 25 October
Light rain. High 57°, low 44°.
0.04Potomac, Monday, 26 October
Light rain. High 70°, low 49°.
0.07
Potomac, 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.
0.1Potomac, 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 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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