Weather in Grafton, IL
Grafton, Thursday, 29 October, 23:23
Overcast. Feels like 65°. High 79°, low 57°.
Monthly outlook for Grafton, IL: average high 63.4°, average low 52.3°. That is 3.7° above the climate normal for October. Precipitation is expected on 7 days (about 2.2 inches), against a normal of 4 days and 1.8 inches. The warmest day looks like 29 October (79.4°), the coolest 11 November (42.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 29 October – 7 November | 68.9° | 58.4° | +5.9° |
| 8 November – 17 November | 54.2° | 53.6° | +0.4° |
| 18 November – 27 November | at normal | 50° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jerseyville (11 mi).
0Grafton, Friday, 30 October
Overcast. High 77°, low 59°.
0Grafton, Saturday, 31 October
Overcast. High 72°, low 61°.
0.08
Grafton, Sunday, 1 November
Light rain. High 69°, low 59°.
0Grafton, Monday, 2 November
Overcast. High 69°, low 58°.
0.71Grafton, Tuesday, 3 November
Rain. High 69°, low 64°.
0.87Grafton, Wednesday, 4 November
Rain. High 64°, low 56°.
0.05Grafton, Thursday, 5 November
Light rain. High 61°, low 56°.
0
Grafton, Friday, 6 November
Partly cloudy. High 64°, low 47°.
0Grafton, Saturday, 7 November
Partly cloudy. High 64°, low 47°.
0.16Grafton, Sunday, 8 November
Light rain. High 56°, low 50°.
0.01Grafton, Monday, 9 November
Light rain. High 54°, low 48°.
0.01Grafton, Tuesday, 10 November
Light rain. High 48°, low 45°.
0Grafton, Wednesday, 11 November
Overcast. High 55°, low 42°.
0.3Grafton, Thursday, 12 November
Rain. High 52°, low 46°.
0Grafton, Friday, 13 November
Light rain. High 60°, low 42°.
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.
0.15Grafton, Thursday, 26 November
Climate normal for this date — 60-year average.
0.21Grafton, Friday, 27 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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