Weather in Port Byron, IL
Port Byron, Friday, 23 October, 01:30
Clear. Feels like 55°. High 74°, low 49°.
Monthly outlook for Port Byron, IL: average high 63°, average low 49.2°. That is 4.3° above the climate normal for October. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 4 days and 1.5 inches. The warmest day looks like 23 October (74.1°), the coolest 5 November (38.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 23 October – 1 November | 67.4° | 56.9° | +5.9° |
| 2 November – 11 November | 55.6° | 51.7° | +2.2° |
| 12 November – 21 November | at normal | 47.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Saturday, 24 October
Overcast. High 72°, low 53°.
0
Port Byron, Sunday, 25 October
Partly cloudy. High 73°, low 53°.
0Port Byron, Monday, 26 October
Overcast. High 69°, low 52°.
0Port Byron, Tuesday, 27 October
Overcast. High 66°, low 49°.
0Port Byron, Wednesday, 28 October
Partly cloudy. High 71°, low 55°.
0.09
Port Byron, Thursday, 29 October
Light rain. High 68°, low 55°.
0.14Port Byron, Friday, 30 October
Light rain. High 58°, low 55°.
0.49Port Byron, Saturday, 31 October
Rain. High 61°, low 56°.
0.04Port Byron, Sunday, 1 November
Light rain. High 62°, low 51°.
0Port Byron, Monday, 2 November
Overcast. High 59°, low 45°.
0.02Port Byron, Tuesday, 3 November
Light rain. High 56°, low 47°.
0.02Port Byron, Wednesday, 4 November
Light rain. High 50°, low 43°.
0Port Byron, Thursday, 5 November
Overcast. High 54°, low 38°.
0
Port Byron, Friday, 6 November
Clear. High 62°, low 45°.
0Port Byron, Saturday, 7 November
Overcast. High 52°, low 41°.
0.04
Port Byron, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11
Port Byron, Monday, 9 November
Climate normal for this date — 60-year average.
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.
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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