Weather in DeKalb, IL
DeKalb, Wednesday, 21 October, 11:55
Clear. Feels like 65°. High 69°, low 41°.
Monthly outlook for DeKalb, IL: average high 62.8°, average low 49.1°. That is 4° above the climate normal for October. Precipitation is expected on 7 days (about 4.5 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 22 October (71.6°), the coolest 30 October (40.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 65.7° | 57° | +4.8° |
| 31 October – 9 November | 58.1° | 52.3° | +3.2° |
| 10 November – 19 November | at normal | 46.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sycamore (6 mi).
0DeKalb, Thursday, 22 October
Clear. High 72°, low 45°.
0DeKalb, Friday, 23 October
Clear. High 69°, low 47°.
0
DeKalb, Saturday, 24 October
Overcast. High 67°, low 49°.
0DeKalb, Sunday, 25 October
Overcast. High 69°, low 50°.
0DeKalb, Monday, 26 October
Overcast. High 69°, low 53°.
0DeKalb, Tuesday, 27 October
Overcast. High 59°, low 51°.
0.03
DeKalb, Wednesday, 28 October
Light rain. High 67°, low 53°.
0.06DeKalb, Thursday, 29 October
Light rain. High 60°, low 43°.
0DeKalb, Friday, 30 October
Overcast. High 55°, low 41°.
0.55DeKalb, Saturday, 31 October
Rain. High 60°, low 47°.
1.52DeKalb, Sunday, 1 November
Rain. High 60°, low 57°.
0.67DeKalb, Monday, 2 November
Rain. High 59°, low 54°.
1.03DeKalb, Tuesday, 3 November
Rain. High 58°, low 53°.
0.46DeKalb, Wednesday, 4 November
Rain. High 60°, low 53°.
0.19DeKalb, Thursday, 5 November
Light rain. High 52°, low 48°.
0.09
DeKalb, Friday, 6 November
Climate normal for this date — 60-year average.
0.03DeKalb, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05
DeKalb, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12
DeKalb, Monday, 9 November
Climate normal for this date — 60-year average.
0.1DeKalb, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07DeKalb, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06DeKalb, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04DeKalb, Friday, 13 November
Climate normal for this date — 60-year average.
0.07DeKalb, Saturday, 14 November
Climate normal for this date — 60-year average.
0.08DeKalb, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05DeKalb, Monday, 16 November
Climate normal for this date — 60-year average.
0.1DeKalb, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.1DeKalb, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.07DeKalb, 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 DeKalb, 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 DeKalb, 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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