Weather in Port Byron, IL
Port Byron, Sunday, 25 October, 11:59
Partly cloudy. Feels like 69°. High 72°, low 52°.
Monthly outlook for Port Byron, IL: average high 63.3°, average low 50.2°. That is 4.9° above the climate normal for October. Precipitation is expected on 6 days (about 1.2 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 25 October (72.1°), the coolest 6 November (41°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 25 October – 3 November | 68.5° | 55.9° | +7° |
| 4 November – 13 November | 54.7° | 50.4° | +2.4° |
| 14 November – 23 November | at normal | 46.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Monday, 26 October
Overcast. High 70°, low 54°.
0Port Byron, Tuesday, 27 October
Overcast. High 70°, low 49°.
0
Port Byron, Wednesday, 28 October
Light rain. High 72°, low 55°.
0.06Port Byron, Thursday, 29 October
Light rain. High 66°, low 58°.
0.08Port Byron, Friday, 30 October
Light rain. High 67°, low 49°.
0.32Port Byron, Saturday, 31 October
Rain. High 69°, low 56°.
0.47Port Byron, Sunday, 1 November
Rain. High 65°, low 57°.
0.09Port Byron, Monday, 2 November
Light rain. High 67°, low 54°.
0.03Port Byron, Tuesday, 3 November
Light rain. High 67°, low 54°.
0Port Byron, Wednesday, 4 November
Partly cloudy. High 57°, low 48°.
0Port Byron, Thursday, 5 November
Overcast. High 54°, low 44°.
0
Port Byron, Friday, 6 November
Clear. High 55°, low 41°.
0.02Port Byron, Saturday, 7 November
Light rain. High 59°, low 43°.
0.09Port Byron, Sunday, 8 November
Light rain. High 54°, low 47°.
0.02Port Byron, Monday, 9 November
Light rain. High 50°, low 43°.
0.1Port Byron, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Port Byron, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Port Byron, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Port Byron, Friday, 13 November
Climate normal for this date — 60-year average.
0.06Port Byron, Saturday, 14 November
Climate normal for this date — 60-year average.
0.07Port Byron, Sunday, 15 November
Climate normal for this date — 60-year average.
0.06Port Byron, Monday, 16 November
Climate normal for this date — 60-year average.
0.13Port Byron, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.07Port Byron, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.06Port Byron, Thursday, 19 November
Climate normal for this date — 60-year average.
0.1Port Byron, Friday, 20 November
Climate normal for this date — 60-year average.
0.08Port Byron, Saturday, 21 November
Climate normal for this date — 60-year average.
0.03
Port Byron, Sunday, 22 November
Climate normal for this date — 60-year average.
0.08Port Byron, Monday, 23 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 Port Byron, 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 Port Byron, 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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