Weather in Port Byron, IL
Port Byron, Thursday, 22 October, 01:02
Clear. Feels like 52°. High 76°, low 50°.
Monthly outlook for Port Byron, IL: average high 60°, average low 44.8°. That is 2.3° above the climate normal for October. Precipitation is expected on 4 days (about 1.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 22 October (76°), the coolest 6 November (33.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 22 October – 31 October | 64.6° | 57.4° | +4° |
| 1 November – 10 November | 52.3° | 52.4° | -0.1° |
| 11 November – 20 November | at normal | 47.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Friday, 23 October
Clear. High 74°, low 49°.
0
Port Byron, Saturday, 24 October
Overcast. High 70°, low 53°.
0
Port Byron, Sunday, 25 October
Partly cloudy. High 73°, low 52°.
0Port Byron, Monday, 26 October
Overcast. High 72°, low 53°.
0.14
Port Byron, Tuesday, 27 October
Light rain. High 58°, low 52°.
0.03Port Byron, Wednesday, 28 October
Light rain. High 49°, low 39°.
0Port Byron, Thursday, 29 October
Clear. High 54°, low 35°.
0Port Byron, Friday, 30 October
Partly cloudy. High 59°, low 39°.
0.1Port Byron, Saturday, 31 October
Light rain. High 62°, low 52°.
1.15Port Byron, Sunday, 1 November
Rain. High 55°, low 53°.
0.15Port Byron, Monday, 2 November
Rain. High 53°, low 40°.
0Port Byron, Tuesday, 3 November
Overcast. High 51°, low 36°.
0Port Byron, Wednesday, 4 November
Overcast. High 56°, low 42°.
0Port Byron, Thursday, 5 November
Partly cloudy. High 57°, low 38°.
0Port Byron, Friday, 6 November
Overcast. High 40°, low 33°.
0.02
Port Byron, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Port Byron, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11
Port Byron, Monday, 9 November
Climate normal for this date — 60-year average.
0.1Port Byron, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Port Byron, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Port Byron, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Port Byron, Friday, 13 November
Climate normal for this date — 60-year average.
0.06Port Byron, Saturday, 14 November
Climate normal for this date — 60-year average.
0.07Port Byron, Sunday, 15 November
Climate normal for this date — 60-year average.
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.
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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