Weather in Deer Plain, IL
Deer Plain, Sunday, 11 October, 03:08
Clear. Feels like 58°. High 85°, low 54°.
Monthly outlook for Deer Plain, IL: average high 69.7°, average low 50.2°. That is 2.2° above the climate normal for October. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 12 October (91.4°), the coolest 18 October (30.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 70° | 66.8° | +1.8° |
| 21 October – 30 October | 69.2° | 63.2° | +3.3° |
| 31 October – 9 November | at normal | 58.7° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — O'Fallon (14 mi).
0
Deer Plain, Monday, 12 October
Clear. High 91°, low 62°.
0Deer Plain, Tuesday, 13 October
Clear. High 89°, low 69°.
0.19
Deer Plain, Wednesday, 14 October
Light rain. High 78°, low 67°.
0.98Deer Plain, Thursday, 15 October
Rain. High 67°, low 60°.
0.55Deer Plain, Friday, 16 October
Rain. High 62°, low 42°.
0Deer Plain, Saturday, 17 October
Clear. High 45°, low 34°.
0
Deer Plain, Sunday, 18 October
Mostly clear. High 53°, low 31°.
0Deer Plain, Monday, 19 October
Clear. High 62°, low 39°.
0Deer Plain, Tuesday, 20 October
Clear. High 67°, low 42°.
0Deer Plain, Wednesday, 21 October
Clear. High 72°, low 46°.
0Deer Plain, Thursday, 22 October
Clear. High 71°, low 51°.
0Deer Plain, Friday, 23 October
Clear. High 67°, low 48°.
0
Deer Plain, Saturday, 24 October
Overcast. High 60°, low 53°.
0.38Deer Plain, Sunday, 25 October
Rain. High 67°, low 51°.
0
Deer Plain, Monday, 26 October
Partly cloudy. High 78°, low 55°.
0.09Deer Plain, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.05Deer Plain, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.13Deer Plain, Thursday, 29 October
Climate normal for this date — 60-year average.
0.12Deer Plain, Friday, 30 October
Climate normal for this date — 60-year average.
0.16
Deer Plain, Saturday, 31 October
Climate normal for this date — 60-year average.
0.19Deer Plain, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09Deer Plain, Monday, 2 November
Climate normal for this date — 60-year average.
0.12Deer Plain, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.15Deer Plain, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.17Deer Plain, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09Deer Plain, Friday, 6 November
Climate normal for this date — 60-year average.
0.07Deer Plain, Saturday, 7 November
Climate normal for this date — 60-year average.
0.03Deer Plain, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11Deer Plain, 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 Deer Plain, 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 Deer Plain, 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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