Weather in Posen, IL
Posen, Monday, 19 October, 16:37
Clear. Feels like 67°. High 69°, low 39°.
Monthly outlook for Posen, IL: average high 59.7°, average low 43.9°. That is 1.6° above the climate normal for October. Precipitation is expected on 1 day (about 0.4 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 25 October (69.8°), the coolest 29 October (34.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 62.2° | 57.8° | +2.5° |
| 29 October – 7 November | 55.5° | 54° | +0.8° |
| 8 November – 17 November | at normal | 48.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Blue Island (2 mi).
0Posen, Tuesday, 20 October
Clear. High 68°, low 43°.
0Posen, Wednesday, 21 October
Clear. High 67°, low 43°.
0.02
Posen, Thursday, 22 October
Light rain. High 67°, low 49°.
0Posen, Friday, 23 October
Clear. High 60°, low 44°.
0
Posen, Saturday, 24 October
Overcast. High 60°, low 42°.
0Posen, Sunday, 25 October
Overcast. High 70°, low 47°.
0.02Posen, Monday, 26 October
Light rain. High 63°, low 53°.
0.01Posen, Tuesday, 27 October
Light rain. High 54°, low 43°.
0.01Posen, Wednesday, 28 October
Light rain. High 45°, low 38°.
0Posen, Thursday, 29 October
Clear. High 49°, low 35°.
0Posen, Friday, 30 October
Overcast. High 55°, low 37°.
0Posen, Saturday, 31 October
Overcast. High 62°, low 45°.
0Posen, Sunday, 1 November
Overcast. High 61°, low 50°.
0.37Posen, Monday, 2 November
Rain. High 53°, low 47°.
0.01Posen, Tuesday, 3 November
Light rain. High 53°, low 47°.
0.09
Posen, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.13Posen, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Posen, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Posen, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Posen, Sunday, 8 November
Climate normal for this date — 60-year average.
0.13
Posen, Monday, 9 November
Climate normal for this date — 60-year average.
0.13Posen, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Posen, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Posen, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Posen, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Posen, Saturday, 14 November
Climate normal for this date — 60-year average.
0.1Posen, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Posen, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Posen, Tuesday, 17 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 Posen, 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 Posen, 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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