Weather in Port Byron, IL
Port Byron, Sunday, 1 November, 01:46
Overcast. Feels like 57°. High 66°, low 56°.
Monthly outlook for Port Byron, IL: average high 55.8°, average low 45.1°. That is 2.9° above the climate normal for November. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 3 November (67.2°), the coolest 15 November (34.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 1 November – 10 November | 57.2° | 52.4° | +2.6° |
| 11 November – 20 November | 53.4° | 47.4° | +3.4° |
| 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).
0.41
Port Byron, Monday, 2 November
Rain. High 64°, low 55°.
1.51Port Byron, Tuesday, 3 November
Heavy rain. High 67°, low 63°.
0.04Port Byron, Wednesday, 4 November
Light rain. High 63°, low 53°.
0.06Port Byron, Thursday, 5 November
Light rain. High 53°, low 50°.
0.02Port Byron, Friday, 6 November
Light rain. High 53°, low 44°.
0Port Byron, Saturday, 7 November
Overcast. High 56°, low 40°.
0.01Port Byron, Sunday, 8 November
Light rain. High 48°, low 42°.
0
Port Byron, Monday, 9 November
Clear. High 52°, low 40°.
0Port Byron, Tuesday, 10 November
Overcast. High 50°, low 39°.
0
Port Byron, Wednesday, 11 November
Mostly clear. High 49°, low 35°.
0.09Port Byron, Thursday, 12 November
Light rain. High 54°, low 41°.
0Port Byron, Friday, 13 November
Overcast. High 60°, low 47°.
0Port Byron, Saturday, 14 November
Overcast. High 51°, low 42°.
0Port Byron, Sunday, 15 November
Clear. High 49°, low 34°.
0Port Byron, Monday, 16 November
Overcast. High 57°, low 40°.
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.
0.03Port 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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