Weather in Grafton, IL
Grafton, Tuesday, 27 October, 15:00
Overcast. Feels like 68°. High 69°, low 50°.
Monthly outlook for Grafton, IL: average high 63.2°, average low 51.3°. That is 3° above the climate normal for October. Precipitation is expected on 7 days (about 2.4 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 28 October (77.6°), the coolest 11 November (33.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 27 October – 5 November | 68° | 59.2° | +4.9° |
| 6 November – 15 November | 55.2° | 54.2° | +0.5° |
| 16 November – 25 November | at normal | 51° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jerseyville (11 mi).
0
Grafton, Wednesday, 28 October
Clear. High 78°, low 50°.
0Grafton, Thursday, 29 October
Clear. High 76°, low 54°.
0.17
Grafton, Friday, 30 October
Rain. High 70°, low 58°.
0Grafton, Saturday, 31 October
Overcast. High 70°, low 60°.
0.11Grafton, Sunday, 1 November
Light rain. High 66°, low 60°.
0.03Grafton, Monday, 2 November
Light rain. High 70°, low 60°.
0.45Grafton, Tuesday, 3 November
Rain. High 62°, low 59°.
0.92Grafton, Wednesday, 4 November
Rain. High 58°, low 55°.
0.36Grafton, Thursday, 5 November
Rain. High 61°, low 54°.
0.04Grafton, Friday, 6 November
Light rain. High 52°, low 49°.
0
Grafton, Saturday, 7 November
Partly cloudy. High 58°, low 46°.
0Grafton, Sunday, 8 November
Partly cloudy. High 62°, low 43°.
0.27Grafton, Monday, 9 November
Rain. High 55°, low 50°.
0Grafton, Tuesday, 10 November
Clear. High 53°, low 40°.
0
Grafton, Wednesday, 11 November
Mostly clear. High 50°, low 34°.
0.08Grafton, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Grafton, Friday, 13 November
Climate normal for this date — 60-year average.
0.08Grafton, Saturday, 14 November
Climate normal for this date — 60-year average.
0.12Grafton, Sunday, 15 November
Climate normal for this date — 60-year average.
0.1Grafton, Monday, 16 November
Climate normal for this date — 60-year average.
0.13Grafton, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.16
Grafton, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.09Grafton, Thursday, 19 November
Climate normal for this date — 60-year average.
0.11Grafton, Friday, 20 November
Climate normal for this date — 60-year average.
0.1Grafton, Saturday, 21 November
Climate normal for this date — 60-year average.
0.08Grafton, Sunday, 22 November
Climate normal for this date — 60-year average.
0.09Grafton, Monday, 23 November
Climate normal for this date — 60-year average.
0.13Grafton, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.13Grafton, Wednesday, 25 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 Grafton, 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 Grafton, 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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