Weather in Castalia, IA
Castalia, Tuesday, 13 October, 03:22
Mostly clear. Feels like 59°. High 71°, low 56°.
Monthly outlook for Castalia, IA: average high 58.9°, average low 45.9°. That is 1.7° above the climate normal for October. Precipitation is expected on 4 days (about 1.9 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 13 October (71.1°), the coolest 17 October (35°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 October – 22 October | 61.7° | 57.1° | +2.5° |
| 23 October – 1 November | 54.4° | 53.1° | +0.7° |
| 2 November – 11 November | at normal | 47.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — West Union (13 mi).
0
Castalia, Wednesday, 14 October
Mostly clear. High 66°, low 49°.
0.44
Castalia, Thursday, 15 October
Rain. High 58°, low 51°.
0
Castalia, Friday, 16 October
Overcast. High 52°, low 42°.
0
Castalia, Saturday, 17 October
Clear. High 56°, low 35°.
0Castalia, Sunday, 18 October
Overcast. High 60°, low 45°.
0Castalia, Monday, 19 October
Overcast. High 53°, low 49°.
0Castalia, Tuesday, 20 October
Overcast. High 65°, low 49°.
0.04Castalia, Wednesday, 21 October
Light rain. High 71°, low 56°.
0.51Castalia, Thursday, 22 October
Rain. High 65°, low 61°.
0.82Castalia, Friday, 23 October
Heavy rain. High 66°, low 47°.
0Castalia, Saturday, 24 October
Clear. High 51°, low 40°.
0Castalia, Sunday, 25 October
Mostly clear. High 50°, low 36°.
0Castalia, Monday, 26 October
Overcast. High 53°, low 37°.
0.02Castalia, Tuesday, 27 October
Light rain. High 59°, low 42°.
0Castalia, Wednesday, 28 October
Mostly clear. High 48°, low 40°.
0.1
Castalia, Thursday, 29 October
Climate normal for this date — 60-year average.
0.08Castalia, Friday, 30 October
Climate normal for this date — 60-year average.
0.1Castalia, Saturday, 31 October
Climate normal for this date — 60-year average.
0.18Castalia, Sunday, 1 November
Climate normal for this date — 60-year average.
0.07Castalia, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Castalia, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.08Castalia, Wednesday, 4 November
Climate normal for this date — 60-year average.
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.
0.02Castalia, 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.
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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