Weather in Deer Plain, IL
Deer Plain, Friday, 9 October, 20:58
Clear. Feels like 71°. High 89°, low 55°.
Monthly outlook for Deer Plain, IL: average high 71.8°, average low 53°. That is 2.9° above the climate normal for October. Precipitation is expected on 5 days (about 2.3 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 13 October (89.7°), the coolest 18 October (34.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 76° | 67.8° | +4.6° |
| 19 October – 28 October | 64.8° | 63.6° | +0.7° |
| 29 October – 7 November | at normal | 59.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — O'Fallon (14 mi).
0
Deer Plain, Saturday, 10 October
Overcast. High 81°, low 55°.
0
Deer Plain, Sunday, 11 October
Clear. High 85°, low 50°.
0Deer Plain, Monday, 12 October
Clear. High 90°, low 66°.
0.12
Deer Plain, Tuesday, 13 October
Light rain. High 90°, low 70°.
0.65Deer Plain, Wednesday, 14 October
Rain. High 77°, low 68°.
0.68Deer Plain, Thursday, 15 October
Heavy rain. High 74°, low 61°.
0Deer Plain, Friday, 16 October
Overcast. High 68°, low 52°.
0Deer Plain, Saturday, 17 October
Overcast. High 50°, low 39°.
0Deer Plain, Sunday, 18 October
Clear. High 56°, low 34°.
0Deer Plain, Monday, 19 October
Overcast. High 63°, low 42°.
0Deer Plain, Tuesday, 20 October
Overcast. High 69°, low 47°.
0.19Deer Plain, Wednesday, 21 October
Light rain. High 64°, low 57°.
0.65Deer Plain, Thursday, 22 October
Rain. High 61°, low 56°.
0Deer Plain, Friday, 23 October
Clear. High 70°, low 49°.
0Deer Plain, Saturday, 24 October
Overcast. High 61°, low 47°.
0.13
Deer Plain, Sunday, 25 October
Climate normal for this date — 60-year average.
0.13
Deer Plain, Monday, 26 October
Climate normal for this date — 60-year average.
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.
0.16Deer 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.
0.07
Deer Plain, Saturday, 7 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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