Weather in Port Byron, IL
Port Byron, Friday, 13 November, 04:58
Overcast. Feels like 29°. High 42°, low 33°.
Monthly outlook for Port Byron, IL: average high 48.8°, average low 34.1°. That is 2° above the climate normal for November. Precipitation is expected on 3 days (about 1.0 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 22 November (64.1°), the coolest 25 November (20.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 November – 22 November | 54° | 46.9° | +3.9° |
| 23 November – 2 December | 40.1° | 41.3° | -0.7° |
| 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 29°.
0Port Byron, Sunday, 15 November
Clear. High 47°, low 29°.
0Port Byron, Monday, 16 November
Clear. High 51°, low 32°.
0
Port Byron, Tuesday, 17 November
Partly cloudy. High 54°, low 34°.
0Port Byron, Wednesday, 18 November
Overcast. High 57°, low 37°.
0Port Byron, Thursday, 19 November
Partly cloudy. High 62°, low 48°.
0.02
Port Byron, Friday, 20 November
Light rain. High 56°, low 40°.
0.13Port Byron, Saturday, 21 November
Light rain. High 62°, low 51°.
0.07Port Byron, Sunday, 22 November
Light rain. High 64°, low 54°.
0.82
Port Byron, Monday, 23 November
Snow. High 56°, low 35°.
0Port Byron, Tuesday, 24 November
Overcast. High 31°, low 24°.
0Port Byron, Wednesday, 25 November
Clear. High 32°, low 21°.
0Port Byron, Thursday, 26 November
Clear. High 35°, low 23°.
0
Port Byron, Friday, 27 November
Mostly clear. High 41°, low 26°.
0Port Byron, Saturday, 28 November
Overcast. High 46°, low 32°.
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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