Weather in Sullivan, IL
Sullivan, Saturday, 10 October, 18:27
Overcast. Feels like 70°. High 77°, low 56°.
Monthly outlook for Sullivan, IL: average high 65.6°, average low 48.1°. That is 0.8° above the climate normal for October. Precipitation is expected on 4 days (about 2.0 inches), against a normal of 4 days and 1.8 inches. The warmest day looks like 13 October (87.4°), the coolest 18 October (30.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 67.9° | 65.1° | +1.6° |
| 20 October – 29 October | 61.7° | 61.2° | +0.3° |
| 30 October – 8 November | at normal | 57.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Lake City (12 mi).
0
Sullivan, Sunday, 11 October
Clear. High 81°, low 53°.
0
Sullivan, Monday, 12 October
Partly cloudy. High 86°, low 59°.
0Sullivan, Tuesday, 13 October
Clear. High 87°, low 67°.
0.23
Sullivan, Wednesday, 14 October
Rain. High 79°, low 69°.
1.51Sullivan, Thursday, 15 October
Rain. High 65°, low 60°.
0.13Sullivan, Friday, 16 October
Rain. High 61°, low 44°.
0Sullivan, Saturday, 17 October
Overcast. High 40°, low 33°.
0Sullivan, Sunday, 18 October
Clear. High 48°, low 30°.
0Sullivan, Monday, 19 October
Overcast. High 54°, low 32°.
0Sullivan, Tuesday, 20 October
Clear. High 61°, low 36°.
0Sullivan, Wednesday, 21 October
Clear. High 68°, low 42°.
0Sullivan, Thursday, 22 October
Overcast. High 70°, low 46°.
0.02Sullivan, Friday, 23 October
Light rain. High 57°, low 47°.
0.07Sullivan, Saturday, 24 October
Light rain. High 54°, low 44°.
0.01Sullivan, Sunday, 25 October
Light rain. High 61°, low 49°.
0.13Sullivan, Monday, 26 October
Climate normal for this date — 60-year average.
0.09
Sullivan, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06
Sullivan, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.07Sullivan, Thursday, 29 October
Climate normal for this date — 60-year average.
0.11Sullivan, Friday, 30 October
Climate normal for this date — 60-year average.
0.17Sullivan, Saturday, 31 October
Climate normal for this date — 60-year average.
0.2Sullivan, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09Sullivan, Monday, 2 November
Climate normal for this date — 60-year average.
0.09Sullivan, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.1Sullivan, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.11Sullivan, Thursday, 5 November
Climate normal for this date — 60-year average.
0.08Sullivan, Friday, 6 November
Climate normal for this date — 60-year average.
0.09Sullivan, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Sullivan, Sunday, 8 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 Sullivan, 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 Sullivan, 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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