Weather in Grafton, IL
Grafton, Thursday, 12 November, 22:26
Overcast. Feels like 36°. High 50°, low 42°.
Monthly outlook for Grafton, IL: average high 55.3°, average low 39.5°. That is 2.5° above the climate normal for November. Precipitation is expected on 3 days (about 3.9 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 19 November (70.5°), the coolest 25 November (26.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 November – 21 November | 57.2° | 52.1° | +2.8° |
| 22 November – 1 December | 52.2° | 47.6° | +2.6° |
| 2 December – 11 December | at normal | 43.2° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Jerseyville (11 mi).
0Grafton, Friday, 13 November
Overcast. High 47°, low 35°.
0
Grafton, Saturday, 14 November
Clear. High 48°, low 33°.
0
Grafton, Sunday, 15 November
Partly cloudy. High 50°, low 31°.
0Grafton, Monday, 16 November
Clear. High 53°, low 34°.
0Grafton, Tuesday, 17 November
Clear. High 53°, low 35°.
0Grafton, Wednesday, 18 November
Overcast. High 62°, low 38°.
0Grafton, Thursday, 19 November
Partly cloudy. High 70°, low 52°.
0Grafton, Friday, 20 November
Partly cloudy. High 69°, low 52°.
0Grafton, Saturday, 21 November
Overcast. High 69°, low 51°.
0Grafton, Sunday, 22 November
Partly cloudy. High 67°, low 52°.
2.48
Grafton, Monday, 23 November
Heavy rain. High 62°, low 57°.
1.31
Grafton, Tuesday, 24 November
Snow. High 58°, low 36°.
0.13Grafton, Wednesday, 25 November
Snow. High 38°, low 27°.
0Grafton, Thursday, 26 November
Overcast. High 39°, low 27°.
0Grafton, Friday, 27 November
Partly cloudy. High 50°, low 32°.
0.09Grafton, Saturday, 28 November
Climate normal for this date — 60-year average.
0.07Grafton, Sunday, 29 November
Climate normal for this date — 60-year average.
0.17Grafton, Monday, 30 November
Climate normal for this date — 60-year average.
0.11Grafton, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.08Grafton, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.11Grafton, Thursday, 3 December
Climate normal for this date — 60-year average.
0.08Grafton, Friday, 4 December
Climate normal for this date — 60-year average.
0.08Grafton, Saturday, 5 December
Climate normal for this date — 60-year average.
0.06
Grafton, Sunday, 6 December
Climate normal for this date — 60-year average.
0.1Grafton, Monday, 7 December
Climate normal for this date — 60-year average.
0.07Grafton, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.07Grafton, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.11Grafton, Thursday, 10 December
Climate normal for this date — 60-year average.
0.09Grafton, Friday, 11 December
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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