Weather in Port Byron, IL
Port Byron, Sunday, 8 November, 16:34
Clear. Feels like 58°. High 61°, low 39°.
Monthly outlook for Port Byron, IL: average high 54.3°, average low 39.4°. That is 3.8° above the climate normal for November. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 17 November (67.9°), the coolest 23 November (29.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 November – 17 November | 56.1° | 48.6° | +4.2° |
| 18 November – 27 November | 51.5° | 44.6° | +3.8° |
| 28 November – 7 December | at normal | 38.2° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Monday, 9 November
Overcast. High 63°, low 36°.
0Port Byron, Tuesday, 10 November
Clear. High 61°, low 40°.
0.04
Port Byron, Wednesday, 11 November
Light rain. High 56°, low 41°.
0Port Byron, Thursday, 12 November
Overcast. High 45°, low 37°.
0Port Byron, Friday, 13 November
Overcast. High 42°, low 35°.
0
Port Byron, Saturday, 14 November
Mostly clear. High 45°, low 30°.
0Port Byron, Sunday, 15 November
Mostly clear. High 58°, low 37°.
0Port Byron, Monday, 16 November
Overcast. High 62°, low 45°.
0.04Port Byron, Tuesday, 17 November
Light rain. High 68°, low 53°.
0.32Port Byron, Wednesday, 18 November
Light rain. High 65°, low 52°.
0Port Byron, Thursday, 19 November
Overcast. High 58°, low 45°.
0Port Byron, Friday, 20 November
Clear. High 52°, low 42°.
0Port Byron, Saturday, 21 November
Overcast. High 47°, low 38°.
0Port Byron, Sunday, 22 November
Clear. High 43°, low 33°.
0Port Byron, Monday, 23 November
Clear. High 44°, low 29°.
0.08
Port 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.
0.12Port 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.
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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