Weather in Castalia, IA
Castalia, Tuesday, 20 October, 21:11
Clear. Feels like 53°. High 68°, low 39°.
Monthly outlook for Castalia, IA: average high 57.3°, average low 40.4°. That is 2.3° above the climate normal for October. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 22 October (73.1°), the coolest 28 October (28°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 60.5° | 54.6° | +3.3° |
| 30 October – 8 November | 52.1° | 49.6° | +1.3° |
| 9 November – 18 November | at normal | 44.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — West Union (13 mi).
0
Castalia, Wednesday, 21 October
Clear. High 71°, low 44°.
0Castalia, Thursday, 22 October
Clear. High 73°, low 44°.
0Castalia, Friday, 23 October
Clear. High 68°, low 51°.
0
Castalia, Saturday, 24 October
Overcast. High 67°, low 54°.
0
Castalia, Sunday, 25 October
Partly cloudy. High 67°, low 54°.
0.33
Castalia, Monday, 26 October
Rain. High 54°, low 38°.
0Castalia, Tuesday, 27 October
Clear. High 41°, low 28°.
0Castalia, Wednesday, 28 October
Clear. High 45°, low 28°.
0Castalia, Thursday, 29 October
Clear. High 50°, low 30°.
0Castalia, Friday, 30 October
Clear. High 51°, low 32°.
0Castalia, Saturday, 31 October
Overcast. High 56°, low 41°.
0.04Castalia, Sunday, 1 November
Light rain. High 58°, low 51°.
0Castalia, Monday, 2 November
Partly cloudy. High 51°, low 39°.
0Castalia, Tuesday, 3 November
Overcast. High 47°, low 34°.
0Castalia, Wednesday, 4 November
Overcast. High 50°, low 40°.
0.08Castalia, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Castalia, Friday, 6 November
Climate normal for this date — 60-year average.
0.02
Castalia, Saturday, 7 November
Climate normal for this date — 60-year average.
0.03Castalia, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11
Castalia, Monday, 9 November
Climate normal for this date — 60-year average.
0.1Castalia, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.09Castalia, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Castalia, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Castalia, Friday, 13 November
Climate normal for this date — 60-year average.
0.02Castalia, Saturday, 14 November
Climate normal for this date — 60-year average.
0.06Castalia, Sunday, 15 November
Climate normal for this date — 60-year average.
0.06Castalia, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Castalia, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.08Castalia, Wednesday, 18 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 Castalia, IA 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 Castalia, IA 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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