Weather in Green Castle, IA
Green Castle, Sunday, 9 August, 01:06
Overcast. Feels like 74°. High 94°, low 72°.
Monthly outlook for Green Castle, IA: average high 83.4°, average low 63.3°. That is 1.2° above the climate normal for August. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 9 August (94.4°), the coolest 21 August (49.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 84.1° | 81.2° | +1.6° |
| 19 August – 28 August | 82.3° | 81.4° | +0.5° |
| 29 August – 7 September | at normal | 79.6° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Mitchellville (8 mi).
0.05
Green Castle, Monday, 10 August
Light rain. High 91°, low 72°.
0
Green Castle, Tuesday, 11 August
Mostly clear. High 91°, low 71°.
0.02Green Castle, Wednesday, 12 August
Light rain. High 87°, low 69°.
0.09Green Castle, Thursday, 13 August
Light rain. High 72°, low 61°.
0Green Castle, Friday, 14 August
Overcast. High 80°, low 60°.
0.09Green Castle, Saturday, 15 August
Light rain. High 68°, low 59°.
0.01Green Castle, Sunday, 16 August
Light rain. High 78°, low 61°.
0Green Castle, Monday, 17 August
Light rain. High 86°, low 66°.
0
Green Castle, Tuesday, 18 August
Partly cloudy. High 94°, low 68°.
0.01Green Castle, Wednesday, 19 August
Light rain. High 79°, low 61°.
0.03Green Castle, Thursday, 20 August
Light rain. High 68°, low 55°.
0Green Castle, Friday, 21 August
Overcast. High 74°, low 50°.
0Green Castle, Saturday, 22 August
Light rain. High 92°, low 59°.
0
Green Castle, Sunday, 23 August
Clear. High 92°, low 64°.
0Green Castle, Monday, 24 August
Overcast. High 90°, low 65°.
0.13
Green Castle, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.19Green Castle, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.16Green Castle, Thursday, 27 August
Climate normal for this date — 60-year average.
0.17Green Castle, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Green Castle, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Green Castle, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09Green Castle, Monday, 31 August
Climate normal for this date — 60-year average.
0.09Green Castle, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Green Castle, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Green Castle, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Green Castle, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Green Castle, Saturday, 5 September
Climate normal for this date — 60-year average.
0.12Green Castle, Sunday, 6 September
Climate normal for this date — 60-year average.
0.16Green Castle, Monday, 7 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 Green Castle, 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 Green Castle, 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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