Weather in Port Byron, IL
Port Byron, Sunday, 1 November, 04:04
Overcast. Feels like 54°. High 68°, low 54°.
Monthly outlook for Port Byron, IL: average high 57.5°, average low 47.2°. That is 3.9° above the climate normal for November. Precipitation is expected on 4 days (about 1.5 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 3 November (69.3°), the coolest 14 November (37.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 1 November – 10 November | 59.4° | 52.4° | +3.9° |
| 11 November – 20 November | 54.3° | 47.4° | +3.8° |
| 21 November – 30 November | at normal | 42.5° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0.43
Port Byron, Monday, 2 November
Rain. High 64°, low 54°.
0.92Port Byron, Tuesday, 3 November
Heavy rain. High 69°, low 63°.
0.02Port Byron, Wednesday, 4 November
Light rain. High 63°, low 53°.
0.04Port Byron, Thursday, 5 November
Light rain. High 54°, low 51°.
0Port Byron, Friday, 6 November
Overcast. High 51°, low 47°.
0Port Byron, Saturday, 7 November
Overcast. High 55°, low 49°.
0
Port Byron, Sunday, 8 November
Clear. High 55°, low 43°.
0Port Byron, Monday, 9 November
Clear. High 56°, low 40°.
0Port Byron, Tuesday, 10 November
Overcast. High 59°, low 44°.
0Port Byron, Wednesday, 11 November
Overcast. High 53°, low 39°.
0.1Port Byron, Thursday, 12 November
Light rain. High 47°, low 45°.
0Port Byron, Friday, 13 November
Overcast. High 49°, low 43°.
0Port Byron, Saturday, 14 November
Clear. High 52°, low 38°.
0Port Byron, Sunday, 15 November
Overcast. High 61°, low 45°.
0Port Byron, Monday, 16 November
Clear. High 64°, low 47°.
0.13
Port 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.
0.07Port Byron, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.11
Port Byron, Thursday, 26 November
Climate normal for this date — 60-year average.
0.15Port Byron, Friday, 27 November
Climate normal for this date — 60-year average.
0.1Port Byron, Saturday, 28 November
Climate normal for this date — 60-year average.
0.07Port Byron, Sunday, 29 November
Climate normal for this date — 60-year average.
0.07Port Byron, Monday, 30 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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