Weather in Port Byron, IL
Port Byron, Friday, 13 November, 11:22
Partly cloudy. Feels like 36°. High 41°, low 33°.
Monthly outlook for Port Byron, IL: average high 44.4°, average low 30.8°. That is 0.4° below the climate normal for November. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 21 November (63.7°), the coolest 24 November (19.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 November – 22 November | 52.1° | 46.9° | +2.9° |
| 23 November – 2 December | 31.6° | 41.3° | -5.4° |
| 3 December – 12 December | at normal | 35.7° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Saturday, 14 November
Clear. High 45°, low 28°.
0
Port Byron, Sunday, 15 November
Mostly clear. High 47°, low 29°.
0Port Byron, Monday, 16 November
Clear. High 51°, low 31°.
0Port Byron, Tuesday, 17 November
Partly cloudy. High 54°, low 35°.
0
Port Byron, Wednesday, 18 November
Overcast. High 56°, low 38°.
0.04
Port Byron, Thursday, 19 November
Light rain. High 62°, low 48°.
0Port Byron, Friday, 20 November
Overcast. High 54°, low 42°.
0.28Port Byron, Saturday, 21 November
Rain. High 64°, low 51°.
0Port Byron, Sunday, 22 November
Overcast. High 46°, low 33°.
0Port Byron, Monday, 23 November
Overcast. High 33°, low 26°.
0Port Byron, Tuesday, 24 November
Overcast. High 27°, low 19°.
0Port Byron, Wednesday, 25 November
Mostly clear. High 29°, low 20°.
0Port Byron, Thursday, 26 November
Overcast. High 34°, low 20°.
0Port Byron, Friday, 27 November
Overcast. High 32°, low 22°.
0Port Byron, Saturday, 28 November
Overcast. High 35°, low 19°.
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.
0.12
Port Byron, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.04Port Byron, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.09Port Byron, Thursday, 3 December
Climate normal for this date — 60-year average.
0.06Port Byron, Friday, 4 December
Climate normal for this date — 60-year average.
0.07Port Byron, Saturday, 5 December
Climate normal for this date — 60-year average.
0.06Port Byron, Sunday, 6 December
Climate normal for this date — 60-year average.
0.09Port Byron, Monday, 7 December
Climate normal for this date — 60-year average.
0.08Port Byron, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.08Port Byron, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.08Port Byron, Thursday, 10 December
Climate normal for this date — 60-year average.
0.09Port Byron, Friday, 11 December
Climate normal for this date — 60-year average.
0.05Port Byron, Saturday, 12 December
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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