Weather in Port Byron, IL
Port Byron, Saturday, 31 October, 01:45
Overcast. Feels like 52°. High 65°, low 53°.
Monthly outlook for Port Byron, IL: average high 59.9°, average low 48.1°. That is 4.9° above the climate normal for October. Precipitation is expected on 6 days (about 2.8 inches), against a normal of 4 days and 1.3 inches. The warmest day looks like 1 November (66.2°), the coolest 14 November (31.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 31 October – 9 November | 62.8° | 53° | +5.4° |
| 10 November – 19 November | 55° | 47.8° | +4° |
| 20 November – 29 November | at normal | 43° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0.06
Port Byron, Sunday, 1 November
Rain. High 66°, low 53°.
0.24Port Byron, Monday, 2 November
Rain. High 62°, low 54°.
0.47Port Byron, Tuesday, 3 November
Rain. High 66°, low 62°.
1.55Port Byron, Wednesday, 4 November
Rain. High 66°, low 62°.
0.35Port Byron, Thursday, 5 November
Rain. High 63°, low 51°.
0
Port Byron, Friday, 6 November
Partly cloudy. High 58°, low 47°.
0Port Byron, Saturday, 7 November
Overcast. High 59°, low 46°.
0Port Byron, Sunday, 8 November
Overcast. High 60°, low 48°.
0
Port Byron, Monday, 9 November
Clear. High 62°, low 47°.
0Port Byron, Tuesday, 10 November
Clear. High 65°, low 47°.
0Port Byron, Wednesday, 11 November
Overcast. High 62°, low 50°.
0Port Byron, Thursday, 12 November
Clear. High 61°, low 45°.
0Port Byron, Friday, 13 November
Clear. High 47°, low 37°.
0Port Byron, Saturday, 14 November
Overcast. High 47°, low 31°.
0Port Byron, Sunday, 15 November
Overcast. High 48°, low 37°.
0.06Port Byron, Monday, 16 November
Climate normal for this date — 60-year average.
0.13Port 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.
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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