Weather in Old Princeton, IL
Old Princeton, Sunday, 9 August, 04:32
Partly cloudy. Feels like 68°. High 93°, low 69°.
0
Old Princeton, Monday, 10 August
Light rain. High 98°, low 77°.
0.03Old Princeton, Tuesday, 11 August
Light rain. High 103°, low 70°.
0.18Old Princeton, Wednesday, 12 August
Rain. High 94°, low 73°.
0.08Old Princeton, Thursday, 13 August
Light rain. High 87°, low 69°.
0.28Old Princeton, Friday, 14 August
Light rain. High 73°, low 63°.
0.24Old Princeton, Saturday, 15 August
Light rain. High 81°, low 64°.
0Old Princeton, Sunday, 16 August
Light rain. High 87°, low 67°.
0
Old Princeton, Monday, 17 August
Overcast. High 85°, low 68°.
0Old Princeton, Tuesday, 18 August
Overcast. High 89°, low 67°.
0
Old Princeton, Wednesday, 19 August
Mostly clear. High 104°, low 76°.
0
Old Princeton, Thursday, 20 August
Partly cloudy. High 115°, low 79°.
0Old Princeton, Friday, 21 August
Overcast. High 101°, low 77°.
0
Old Princeton, Saturday, 22 August
Clear. High 108°, low 75°.
0.1Old Princeton, Sunday, 23 August
Light rain. High 108°, low 78°.
0.28Old Princeton, Monday, 24 August
Rain. High 94°, low 72°.
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 Old Princeton, 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 Old Princeton, 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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