Weather in Arthur, IL
Arthur, Wednesday, 21 October, 02:50
Clear. Feels like 49°. High 74°, low 45°.
Monthly outlook for Arthur, IL: average high 63.4°, average low 45.4°. That is 2° above the climate normal for October. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 21 October (74.1°), the coolest 29 October (36.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 65.8° | 61° | +2.6° |
| 31 October – 9 November | 59.5° | 56.7° | +1.6° |
| 10 November – 19 November | at normal | 51.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Lake City (13 mi).
0
Arthur, Thursday, 22 October
Clear. High 74°, low 45°.
0Arthur, Friday, 23 October
Clear. High 71°, low 49°.
0
Arthur, Saturday, 24 October
Overcast. High 70°, low 49°.
0Arthur, Sunday, 25 October
Overcast. High 74°, low 49°.
0Arthur, Monday, 26 October
Overcast. High 73°, low 55°.
0.12
Arthur, Tuesday, 27 October
Light rain. High 55°, low 43°.
0Arthur, Wednesday, 28 October
Overcast. High 52°, low 39°.
0Arthur, Thursday, 29 October
Clear. High 57°, low 36°.
0
Arthur, Friday, 30 October
Mostly clear. High 60°, low 40°.
0Arthur, Saturday, 31 October
Mostly clear. High 65°, low 41°.
0.59Arthur, Sunday, 1 November
Rain. High 58°, low 50°.
0Arthur, Monday, 2 November
Clear. High 67°, low 53°.
0
Arthur, Tuesday, 3 November
Partly cloudy. High 56°, low 42°.
0Arthur, Wednesday, 4 November
Overcast. High 52°, low 44°.
0Arthur, Thursday, 5 November
Clear. High 58°, low 44°.
0.08Arthur, Friday, 6 November
Climate normal for this date — 60-year average.
0.09Arthur, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Arthur, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11
Arthur, Monday, 9 November
Climate normal for this date — 60-year average.
0.14Arthur, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.1Arthur, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.07Arthur, Thursday, 12 November
Climate normal for this date — 60-year average.
0.07Arthur, Friday, 13 November
Climate normal for this date — 60-year average.
0.09Arthur, Saturday, 14 November
Climate normal for this date — 60-year average.
0.11Arthur, Sunday, 15 November
Climate normal for this date — 60-year average.
0.09Arthur, Monday, 16 November
Climate normal for this date — 60-year average.
0.12Arthur, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.17Arthur, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.08Arthur, Thursday, 19 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 Arthur, 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 Arthur, 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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