Weather in Big Rock, IL
Big Rock, Saturday, 8 August, 19:52
Clear. Feels like 75°. High 83°, low 68°.
Monthly outlook for Big Rock, IL: average high 76.9°, average low 61.6°. That is 1.8° below the climate normal for August. Precipitation is expected on 3 days (about 0.9 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 9 August (89°), the coolest 23 August (50.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 78.5° | 80.3° | -1° |
| 18 August – 27 August | 74.3° | 80.2° | -3.3° |
| 28 August – 6 September | at normal | 78.7° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Aurora (12 mi).
0.36
Big Rock, Sunday, 9 August
Rain. High 89°, low 62°.
0.29Big Rock, Monday, 10 August
Heavy rain. High 87°, low 70°.
0.02Big Rock, Tuesday, 11 August
Light rain. High 84°, low 71°.
0.02Big Rock, Wednesday, 12 August
Light rain. High 79°, low 67°.
0
Big Rock, Thursday, 13 August
Overcast. High 73°, low 61°.
0Big Rock, Friday, 14 August
Clear. High 76°, low 58°.
0.04Big Rock, Saturday, 15 August
Light rain. High 65°, low 59°.
0Big Rock, Sunday, 16 August
Overcast. High 72°, low 60°.
0Big Rock, Monday, 17 August
Light rain. High 77°, low 64°.
0Big Rock, Tuesday, 18 August
Overcast. High 81°, low 65°.
0.03Big Rock, Wednesday, 19 August
Light rain. High 74°, low 59°.
0.04Big Rock, Thursday, 20 August
Light rain. High 76°, low 53°.
0.02Big Rock, Friday, 21 August
Light rain. High 78°, low 62°.
0.02Big Rock, Saturday, 22 August
Light rain. High 71°, low 56°.
0Big Rock, Sunday, 23 August
Clear. High 67°, low 50°.
0.13
Big Rock, Monday, 24 August
Climate normal for this date — 60-year average.
0.09
Big Rock, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.18Big Rock, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13Big Rock, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13Big Rock, Friday, 28 August
Climate normal for this date — 60-year average.
0.14Big Rock, Saturday, 29 August
Climate normal for this date — 60-year average.
0.08Big Rock, Sunday, 30 August
Climate normal for this date — 60-year average.
0.08
Big Rock, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Big Rock, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.05Big Rock, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Big Rock, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Big Rock, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Big Rock, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Big Rock, Sunday, 6 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 Big Rock, 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 Big Rock, 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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