Weather in Grafton, IL
Grafton, Tuesday, 20 October, 07:46
Clear. Feels like 52°. High 73°, low 48°.
Monthly outlook for Grafton, IL: average high 62.9°, average low 45.4°. That is 1° above the climate normal for October. Precipitation is expected on 4 days (about 0.9 inches), against a normal of 4 days and 1.8 inches. The warmest day looks like 25 October (75.7°), the coolest 28 October (28.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 66.8° | 62.3° | +2.5° |
| 30 October – 8 November | 56.3° | 57.9° | -0.9° |
| 9 November – 18 November | at normal | 53.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jerseyville (11 mi).
0
Grafton, Wednesday, 21 October
Light rain. High 74°, low 46°.
0Grafton, Thursday, 22 October
Clear. High 72°, low 51°.
0Grafton, Friday, 23 October
Clear. High 70°, low 52°.
0
Grafton, Saturday, 24 October
Partly cloudy. High 72°, low 52°.
0
Grafton, Sunday, 25 October
Overcast. High 76°, low 55°.
0Grafton, Monday, 26 October
Overcast. High 74°, low 58°.
0Grafton, Tuesday, 27 October
Overcast. High 56°, low 44°.
0Grafton, Wednesday, 28 October
Clear. High 47°, low 29°.
0.04Grafton, Thursday, 29 October
Light rain. High 55°, low 30°.
0.11Grafton, Friday, 30 October
Light rain. High 49°, low 42°.
0
Grafton, Saturday, 31 October
Mostly clear. High 62°, low 45°.
0.26Grafton, Sunday, 1 November
Rain. High 51°, low 47°.
0.51Grafton, Monday, 2 November
Rain. High 57°, low 47°.
0Grafton, Tuesday, 3 November
Overcast. High 56°, low 40°.
0Grafton, Wednesday, 4 November
Partly cloudy. High 62°, low 40°.
0.16
Grafton, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09Grafton, Friday, 6 November
Climate normal for this date — 60-year average.
0.07Grafton, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Grafton, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1Grafton, Monday, 9 November
Climate normal for this date — 60-year average.
0.14Grafton, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.1Grafton, Wednesday, 11 November
Climate normal for this date — 60-year average.
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.
0.16Grafton, Wednesday, 18 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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