Weather in Deer Plain, IL
Deer Plain, Monday, 12 October, 16:54
Clear. Feels like 93°. High 92°, low 64°.
Monthly outlook for Deer Plain, IL: average high 75.4°, average low 56.4°. That is 5.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 13 October (93°), the coolest 17 October (43.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 76.4° | 66.5° | +5.5° |
| 22 October – 31 October | 73.8° | 62.7° | +6.2° |
| 1 November – 10 November | at normal | 58.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — O'Fallon (14 mi).
0Deer Plain, Tuesday, 13 October
Clear. High 93°, low 66°.
0.56
Deer Plain, Wednesday, 14 October
Heavy rain. High 78°, low 65°.
0.87Deer Plain, Thursday, 15 October
Heavy rain. High 80°, low 70°.
0.13Deer Plain, Friday, 16 October
Light rain. High 64°, low 52°.
0Deer Plain, Saturday, 17 October
Clear. High 60°, low 44°.
0Deer Plain, Sunday, 18 October
Clear. High 69°, low 46°.
0
Deer Plain, Monday, 19 October
Overcast. High 71°, low 51°.
0Deer Plain, Tuesday, 20 October
Light rain. High 77°, low 58°.
0Deer Plain, Wednesday, 21 October
Clear. High 80°, low 60°.
0Deer Plain, Thursday, 22 October
Overcast. High 83°, low 65°.
0Deer Plain, Friday, 23 October
Overcast. High 83°, low 69°.
0.1Deer Plain, Saturday, 24 October
Light rain. High 74°, low 56°.
0
Deer Plain, Sunday, 25 October
Mostly clear. High 62°, low 44°.
0Deer Plain, Monday, 26 October
Clear. High 66°, low 44°.
0Deer Plain, Tuesday, 27 October
Mostly clear. High 74°, low 49°.
0.05
Deer 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.
0.12Deer Plain, Tuesday, 10 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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