Weather in Summerville, IL
Summerville, Friday, 13 November, 08:22
Overcast. Feels like 31°. High 44°, low 35°.
Monthly outlook for Summerville, IL: average high 48.7°, average low 33.2°. That is 1° below the climate normal for November. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 21 November (68.2°), the coolest 25 November (16°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 November – 22 November | 54.8° | 52° | +1.5° |
| 23 November – 2 December | 38.6° | 47.2° | -4.8° |
| 3 December – 12 December | at normal | 42.8° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Jerseyville (12 mi).
0
Summerville, Saturday, 14 November
Clear. High 46°, low 31°.
0
Summerville, Sunday, 15 November
Partly cloudy. High 50°, low 29°.
0Summerville, Monday, 16 November
Clear. High 53°, low 31°.
0Summerville, Tuesday, 17 November
Partly cloudy. High 54°, low 35°.
0Summerville, Wednesday, 18 November
Overcast. High 59°, low 38°.
0.14
Summerville, Thursday, 19 November
Light rain. High 56°, low 48°.
0Summerville, Friday, 20 November
Overcast. High 63°, low 54°.
0.19Summerville, Saturday, 21 November
Rain. High 68°, low 52°.
0Summerville, Sunday, 22 November
Overcast. High 55°, low 40°.
0Summerville, Monday, 23 November
Partly cloudy. High 44°, low 31°.
0Summerville, Tuesday, 24 November
Clear. High 28°, low 20°.
0Summerville, Wednesday, 25 November
Clear. High 33°, low 16°.
0
Summerville, Thursday, 26 November
Mostly clear. High 38°, low 17°.
0Summerville, Friday, 27 November
Clear. High 43°, low 29°.
0Summerville, Saturday, 28 November
Clear. High 45°, low 25°.
0.07Summerville, Sunday, 29 November
Climate normal for this date — 60-year average.
0.17Summerville, Monday, 30 November
Climate normal for this date — 60-year average.
0.11Summerville, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.08Summerville, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.11Summerville, Thursday, 3 December
Climate normal for this date — 60-year average.
0.08Summerville, Friday, 4 December
Climate normal for this date — 60-year average.
0.08Summerville, Saturday, 5 December
Climate normal for this date — 60-year average.
0.06
Summerville, Sunday, 6 December
Climate normal for this date — 60-year average.
0.1Summerville, Monday, 7 December
Climate normal for this date — 60-year average.
0.07Summerville, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.07Summerville, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.11Summerville, Thursday, 10 December
Climate normal for this date — 60-year average.
0.09Summerville, Friday, 11 December
Climate normal for this date — 60-year average.
0.07Summerville, Saturday, 12 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 Summerville, 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 Summerville, 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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