Weather in Deer Plain, IL
Deer Plain, Saturday, 10 October, 07:44
Overcast. Feels like 59°. High 83°, low 57°.
Monthly outlook for Deer Plain, IL: average high 70.5°, average low 51.6°. That is 2.4° above the climate normal for October. Precipitation is expected on 4 days (about 1.0 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 12 October (90°), the coolest 18 October (33.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 72.9° | 67.1° | +3.2° |
| 20 October – 29 October | 66.5° | 63.4° | +1.7° |
| 30 October – 8 November | at normal | 59.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — O'Fallon (14 mi).
0
Deer Plain, Sunday, 11 October
Clear. High 88°, low 51°.
0Deer Plain, Monday, 12 October
Clear. High 90°, low 66°.
0
Deer Plain, Tuesday, 13 October
Mostly clear. High 90°, low 71°.
0.3
Deer Plain, Wednesday, 14 October
Rain. High 77°, low 69°.
0.26Deer Plain, Thursday, 15 October
Rain. High 70°, low 62°.
0Deer Plain, Friday, 16 October
Overcast. High 71°, low 54°.
0.01Deer Plain, Saturday, 17 October
Light rain. High 50°, low 40°.
0Deer Plain, Sunday, 18 October
Clear. High 52°, low 33°.
0Deer Plain, Monday, 19 October
Mostly clear. High 58°, low 37°.
0Deer Plain, Tuesday, 20 October
Overcast. High 63°, low 43°.
0Deer Plain, Wednesday, 21 October
Clear. High 70°, low 45°.
0Deer Plain, Thursday, 22 October
Clear. High 74°, low 50°.
0.28Deer Plain, Friday, 23 October
Light rain. High 63°, low 55°.
0.2Deer Plain, Saturday, 24 October
Light rain. High 68°, low 51°.
0Deer Plain, Sunday, 25 October
Overcast. High 61°, low 43°.
0.13
Deer Plain, Monday, 26 October
Climate normal for this date — 60-year average.
0.09
Deer 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.
0.16Deer 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.
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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