Weather in DeKalb, IL
DeKalb, Monday, 19 October, 03:40
Clear. Feels like 39°. High 66°, low 41°.
Monthly outlook for DeKalb, IL: average high 60°, average low 42.9°. That is 2° above the climate normal for October. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 22 October (68.9°), the coolest 29 October (28.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 63.6° | 57.5° | +3.4° |
| 29 October – 7 November | 54.1° | 53.3° | +0.4° |
| 8 November – 17 November | at normal | 47.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sycamore (6 mi).
0
DeKalb, Tuesday, 20 October
Clear. High 67°, low 42°.
0DeKalb, Wednesday, 21 October
Clear. High 68°, low 45°.
0DeKalb, Thursday, 22 October
Clear. High 69°, low 46°.
0
DeKalb, Friday, 23 October
Partly cloudy. High 66°, low 50°.
0
DeKalb, Saturday, 24 October
Overcast. High 65°, low 47°.
0DeKalb, Sunday, 25 October
Overcast. High 65°, low 53°.
0DeKalb, Monday, 26 October
Partly cloudy. High 66°, low 48°.
0.63
DeKalb, Tuesday, 27 October
Rain. High 61°, low 44°.
0DeKalb, Wednesday, 28 October
Clear. High 42°, low 33°.
0
DeKalb, Thursday, 29 October
Mostly clear. High 43°, low 29°.
0DeKalb, Friday, 30 October
Clear. High 47°, low 30°.
0DeKalb, Saturday, 31 October
Overcast. High 49°, low 33°.
0DeKalb, Sunday, 1 November
Overcast. High 60°, low 42°.
0DeKalb, Monday, 2 November
Overcast. High 62°, low 49°.
0.07DeKalb, Tuesday, 3 November
Light rain. High 63°, low 53°.
0.1DeKalb, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.11DeKalb, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09DeKalb, Friday, 6 November
Climate normal for this date — 60-year average.
0.03DeKalb, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05DeKalb, 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.
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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