Weather in Rock City, IL
Rock City, Sunday, 9 August, 05:14
Overcast. Feels like 61°. High 81°, low 61°.
Monthly outlook for Rock City, IL: average high 81.4°, average low 64.9°. That is 0.9° above the climate normal for August. Precipitation is expected on 4 days (about 1.4 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 20 August (93.5°), the coolest 14 August (57.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 78.3° | 79.9° | -0.9° |
| 19 August – 28 August | 86.5° | 79.9° | +3.7° |
| 29 August – 7 September | at normal | 78° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Freeport (12 mi).
0.22
Rock City, Monday, 10 August
Rain. High 87°, low 70°.
0.1Rock City, Tuesday, 11 August
Rain. High 83°, low 68°.
0Rock City, Wednesday, 12 August
Overcast. High 81°, low 67°.
0Rock City, Thursday, 13 August
Overcast. High 73°, low 60°.
0
Rock City, Friday, 14 August
Partly cloudy. High 74°, low 57°.
0.01Rock City, Saturday, 15 August
Light rain. High 74°, low 58°.
0.03Rock City, Sunday, 16 August
Light rain. High 74°, low 63°.
0Rock City, Monday, 17 August
Overcast. High 79°, low 63°.
0.03Rock City, Tuesday, 18 August
Light rain. High 77°, low 61°.
0.01Rock City, Wednesday, 19 August
Light rain. High 86°, low 67°.
0Rock City, Thursday, 20 August
Overcast. High 93°, low 77°.
0
Rock City, Friday, 21 August
Mostly clear. High 85°, low 69°.
0.01Rock City, Saturday, 22 August
Light rain. High 89°, low 65°.
0.01Rock City, Sunday, 23 August
Light rain. High 86°, low 69°.
0.09Rock City, Monday, 24 August
Light rain. High 79°, low 64°.
0.1Rock City, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.18
Rock City, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Rock City, Thursday, 27 August
Climate normal for this date — 60-year average.
0.17Rock City, Friday, 28 August
Climate normal for this date — 60-year average.
0.16Rock City, Saturday, 29 August
Climate normal for this date — 60-year average.
0.07Rock City, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Rock City, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Rock City, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Rock City, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.12Rock City, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Rock City, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Rock City, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Rock City, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13Rock City, Monday, 7 September
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 Rock City, 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 Rock City, 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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