Weather in Port Byron, IL
Port Byron, Wednesday, 21 October, 10:43
Clear. Feels like 61°. High 73°, low 44°.
Monthly outlook for Port Byron, IL: average high 63.6°, average low 50.6°. That is 4° above the climate normal for October. Precipitation is expected on 8 days (about 3.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 22 October (75.1°), the coolest 30 October (40.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 67.6° | 57.9° | +5.4° |
| 31 October – 9 November | 57.1° | 53° | +2.3° |
| 10 November – 19 November | at normal | 47.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0Port Byron, Thursday, 22 October
Clear. High 75°, low 50°.
0
Port Byron, Friday, 23 October
Partly cloudy. High 71°, low 55°.
0
Port Byron, Saturday, 24 October
Overcast. High 69°, low 53°.
0Port Byron, Sunday, 25 October
Overcast. High 72°, low 52°.
0Port Byron, Monday, 26 October
Overcast. High 71°, low 55°.
0.05
Port Byron, Tuesday, 27 October
Light rain. High 61°, low 52°.
0Port Byron, Wednesday, 28 October
Partly cloudy. High 67°, low 55°.
0.05Port Byron, Thursday, 29 October
Light rain. High 60°, low 44°.
0Port Byron, Friday, 30 October
Overcast. High 57°, low 41°.
0.91Port Byron, Saturday, 31 October
Rain. High 61°, low 51°.
0.84Port Byron, Sunday, 1 November
Rain. High 61°, low 58°.
0.33Port Byron, Monday, 2 November
Light rain. High 57°, low 51°.
0.44Port Byron, Tuesday, 3 November
Rain. High 52°, low 51°.
0.64Port Byron, Wednesday, 4 November
Rain. High 58°, low 52°.
0.3Port Byron, Thursday, 5 November
Rain. High 53°, low 48°.
0.08Port Byron, Friday, 6 November
Climate normal for this date — 60-year average.
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.
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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