Weather in Potomac, IL
Potomac, Sunday, 11 October, 09:02
Clear. Feels like 62°. High 76°, low 57°.
Monthly outlook for Potomac, IL: average high 69.2°, average low 52.1°. That is 3.7° above the climate normal for October. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 13 October (86.3°), the coolest 18 October (31.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 69.2° | 63.6° | +3.1° |
| 21 October – 30 October | 69.3° | 60° | +5.2° |
| 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
Overcast. High 83°, low 62°.
0
Potomac, Tuesday, 13 October
Partly cloudy. High 86°, low 69°.
0.47
Potomac, Wednesday, 14 October
Rain. High 77°, low 65°.
0.83Potomac, Thursday, 15 October
Heavy rain. High 74°, low 61°.
0.28Potomac, Friday, 16 October
Rain. High 69°, low 49°.
0Potomac, Saturday, 17 October
Clear. High 45°, low 35°.
0Potomac, Sunday, 18 October
Clear. High 52°, low 32°.
0Potomac, Monday, 19 October
Overcast. High 63°, low 39°.
0
Potomac, Tuesday, 20 October
Mostly clear. High 67°, low 44°.
0Potomac, Wednesday, 21 October
Overcast. High 67°, low 49°.
0Potomac, Thursday, 22 October
Overcast. High 71°, low 49°.
0Potomac, Friday, 23 October
Overcast. High 73°, low 56°.
0Potomac, Saturday, 24 October
Overcast. High 72°, low 59°.
0.48Potomac, Sunday, 25 October
Rain. High 78°, low 60°.
0Potomac, Monday, 26 October
Overcast. High 55°, low 47°.
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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