Weather in Deer Plain, IL
Deer Plain, Friday, 16 October, 13:41
Overcast. Feels like 53°. High 59°, low 50°.
Monthly outlook for Deer Plain, IL: average high 70.1°, average low 53.6°. That is 3.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.9 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 29 October (81.2°), the coolest 17 October (41.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 16 October – 25 October | 68.5° | 64.7° | +2.1° |
| 26 October – 4 November | 72.7° | 60.7° | +6.7° |
| 5 November – 14 November | at normal | 55.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — O'Fallon (14 mi).
0
Deer Plain, Saturday, 17 October
Clear. High 58°, low 42°.
0Deer Plain, Sunday, 18 October
Clear. High 62°, low 45°.
0Deer Plain, Monday, 19 October
Clear. High 65°, low 46°.
0Deer Plain, Tuesday, 20 October
Clear. High 69°, low 48°.
0Deer Plain, Wednesday, 21 October
Clear. High 70°, low 51°.
0Deer Plain, Thursday, 22 October
Overcast. High 79°, low 54°.
0Deer Plain, Friday, 23 October
Clear. High 78°, low 59°.
0Deer Plain, Saturday, 24 October
Overcast. High 74°, low 56°.
0Deer Plain, Sunday, 25 October
Overcast. High 71°, low 56°.
0Deer Plain, Monday, 26 October
Overcast. High 79°, low 56°.
0Deer Plain, Tuesday, 27 October
Overcast. High 68°, low 54°.
0.01
Deer Plain, Wednesday, 28 October
Light rain. High 67°, low 59°.
0.05Deer Plain, Thursday, 29 October
Light rain. High 81°, low 63°.
0.3Deer Plain, Friday, 30 October
Rain. High 78°, low 61°.
1.48Deer Plain, Saturday, 31 October
Heavy rain. High 63°, low 60°.
0.19
Deer Plain, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09
Deer 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.
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.
0.09Deer Plain, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.09Deer Plain, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Deer Plain, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Deer Plain, Saturday, 14 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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