Weather in Port Byron, IL
Port Byron, Monday, 26 October, 19:21
Partly cloudy. Feels like 61°. High 67°, low 52°.
Monthly outlook for Port Byron, IL: average high 60.5°, average low 48°. That is 3.6° above the climate normal for October. Precipitation is expected on 5 days (about 3.8 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 28 October (72.4°), the coolest 6 November (36.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 26 October – 4 November | 63.9° | 55.4° | +4.7° |
| 5 November – 14 November | 54.9° | 49.8° | +2.8° |
| 15 November – 24 November | at normal | 46.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Tuesday, 27 October
Overcast. High 72°, low 51°.
0Port Byron, Wednesday, 28 October
Overcast. High 72°, low 53°.
0.02
Port Byron, Thursday, 29 October
Light rain. High 67°, low 54°.
0Port Byron, Friday, 30 October
Overcast. High 68°, low 46°.
0.24Port Byron, Saturday, 31 October
Rain. High 71°, low 58°.
0.02Port Byron, Sunday, 1 November
Light rain. High 63°, low 58°.
0.04Port Byron, Monday, 2 November
Light rain. High 58°, low 55°.
3Port Byron, Tuesday, 3 November
Heavy rain. High 56°, low 44°.
0.37Port Byron, Wednesday, 4 November
Rain. High 44°, low 41°.
0Port Byron, Thursday, 5 November
Overcast. High 51°, low 41°.
0
Port Byron, Friday, 6 November
Clear. High 53°, low 36°.
0Port Byron, Saturday, 7 November
Overcast. High 55°, low 39°.
0Port Byron, Sunday, 8 November
Overcast. High 61°, low 50°.
0Port Byron, Monday, 9 November
Overcast. High 59°, low 46°.
0.06Port Byron, Tuesday, 10 November
Light rain. High 51°, low 44°.
0.07
Port 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.
0.08Port Byron, Tuesday, 24 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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