Weather in Castle Rock, PA
Castle Rock, Sunday, 9 August, 08:41
Partly cloudy. Feels like 80°. High 84°, low 72°.
Monthly outlook for Castle Rock, PA: average high 86.7°, average low 69.3°. That is 2.6° above the climate normal for August. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 6 days and 2.1 inches. The warmest day looks like 23 August (95.1°), the coolest 16 August (59.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 83.4° | 82.7° | +0.4° |
| 19 August – 28 August | 92.1° | 81.3° | +6° |
| 29 August – 7 September | at normal | 80° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Bryn Mawr (7 mi).
0
Castle Rock, Monday, 10 August
Clear. High 89°, low 72°.
0.09
Castle Rock, Tuesday, 11 August
Rain. High 89°, low 72°.
0.02Castle Rock, Wednesday, 12 August
Light rain. High 85°, low 73°.
0.02Castle Rock, Thursday, 13 August
Light rain. High 84°, low 70°.
0
Castle Rock, Friday, 14 August
Overcast. High 77°, low 63°.
0Castle Rock, Saturday, 15 August
Clear. High 78°, low 61°.
0Castle Rock, Sunday, 16 August
Overcast. High 80°, low 60°.
0Castle Rock, Monday, 17 August
Overcast. High 81°, low 65°.
0.01Castle Rock, Tuesday, 18 August
Light rain. High 86°, low 66°.
0Castle Rock, Wednesday, 19 August
Clear. High 90°, low 69°.
0Castle Rock, Thursday, 20 August
Partly cloudy. High 91°, low 70°.
0.15Castle Rock, Friday, 21 August
Rain. High 94°, low 72°.
0.09Castle Rock, Saturday, 22 August
Light rain. High 92°, low 74°.
0Castle Rock, Sunday, 23 August
Clear. High 95°, low 73°.
0Castle Rock, Monday, 24 August
Overcast. High 90°, low 78°.
0.06
Castle Rock, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.06Castle Rock, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.18
Castle Rock, Thursday, 27 August
Climate normal for this date — 60-year average.
0.24Castle Rock, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Castle Rock, Saturday, 29 August
Climate normal for this date — 60-year average.
0.06Castle Rock, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Castle Rock, Monday, 31 August
Climate normal for this date — 60-year average.
0.14Castle Rock, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.11Castle Rock, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.15Castle Rock, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Castle Rock, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Castle Rock, Saturday, 5 September
Climate normal for this date — 60-year average.
0.21Castle Rock, Sunday, 6 September
Climate normal for this date — 60-year average.
0.11Castle Rock, 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 Castle Rock, PA 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 Castle Rock, PA 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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