Weather in Cortland, IL
Cortland, Sunday, 18 October, 03:53
Clear. Feels like 33°. High 64°, low 39°.
Monthly outlook for Cortland, IL: average high 64.6°, average low 48.6°. That is 4.3° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 1 November (74.6°), the coolest 26 October (38.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 62.8° | 57.9° | +2.7° |
| 28 October – 6 November | 67.6° | 53.8° | +7.7° |
| 7 November – 16 November | at normal | 48° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sycamore (5 mi).
0
Cortland, Monday, 19 October
Mostly clear. High 67°, low 43°.
0
Cortland, Tuesday, 20 October
Clear. High 65°, low 44°.
0Cortland, Wednesday, 21 October
Clear. High 66°, low 45°.
0Cortland, Thursday, 22 October
Clear. High 68°, low 49°.
0
Cortland, Friday, 23 October
Overcast. High 63°, low 48°.
0Cortland, Saturday, 24 October
Overcast. High 69°, low 55°.
0Cortland, Sunday, 25 October
Overcast. High 58°, low 44°.
0Cortland, Monday, 26 October
Overcast. High 54°, low 38°.
0.14
Cortland, Tuesday, 27 October
Light rain. High 53°, low 48°.
0Cortland, Wednesday, 28 October
Overcast. High 62°, low 52°.
0Cortland, Thursday, 29 October
Overcast. High 66°, low 53°.
0.01Cortland, Friday, 30 October
Light rain. High 69°, low 53°.
0.04Cortland, Saturday, 31 October
Light rain. High 72°, low 56°.
0Cortland, Sunday, 1 November
Overcast. High 75°, low 61°.
0Cortland, Monday, 2 November
Mostly clear. High 63°, low 50°.
0.07
Cortland, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.1Cortland, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.11Cortland, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09Cortland, Friday, 6 November
Climate normal for this date — 60-year average.
0.03Cortland, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05Cortland, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12
Cortland, Monday, 9 November
Climate normal for this date — 60-year average.
0.1Cortland, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Cortland, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Cortland, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04Cortland, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Cortland, Saturday, 14 November
Climate normal for this date — 60-year average.
0.08Cortland, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Cortland, Monday, 16 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 Cortland, 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 Cortland, 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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