Weather in Greencastle, PA
Greencastle, Saturday, 8 August, 17:46
Overcast. Feels like 101°. High 90°, low 70°.
Monthly outlook for Greencastle, PA: average high 83.7°, average low 63.2°. That is 0.2° above the climate normal for August. Precipitation is expected on 6 days (about 1.1 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 10 August (95.9°), the coolest 15 August (54°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 86.3° | 84.1° | +1.2° |
| 18 August – 27 August | 79.2° | 82.5° | -1.8° |
| 28 August – 6 September | at normal | 81.7° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Hagerstown (10 mi).
0
Greencastle, Sunday, 9 August
Partly cloudy. High 88°, low 70°.
0.13
Greencastle, Monday, 10 August
Rain. High 96°, low 68°.
0.04Greencastle, Tuesday, 11 August
Light rain. High 90°, low 68°.
0.45Greencastle, Wednesday, 12 August
Rain. High 83°, low 66°.
0.01Greencastle, Thursday, 13 August
Light rain. High 88°, low 67°.
0.06Greencastle, Friday, 14 August
Light rain. High 81°, low 60°.
0
Greencastle, Saturday, 15 August
Clear. High 79°, low 54°.
0Greencastle, Sunday, 16 August
Clear. High 82°, low 54°.
0Greencastle, Monday, 17 August
Partly cloudy. High 88°, low 60°.
0.23Greencastle, Tuesday, 18 August
Rain. High 76°, low 66°.
0Greencastle, Wednesday, 19 August
Overcast. High 85°, low 66°.
0.01Greencastle, Thursday, 20 August
Light rain. High 83°, low 60°.
0.2Greencastle, Friday, 21 August
Light rain. High 68°, low 62°.
0Greencastle, Saturday, 22 August
Clear. High 86°, low 66°.
0Greencastle, Sunday, 23 August
Clear. High 77°, low 56°.
0.06Greencastle, Monday, 24 August
Climate normal for this date — 60-year average.
0.05
Greencastle, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.05Greencastle, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13
Greencastle, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14Greencastle, Friday, 28 August
Climate normal for this date — 60-year average.
0.06Greencastle, Saturday, 29 August
Climate normal for this date — 60-year average.
0.04Greencastle, Sunday, 30 August
Climate normal for this date — 60-year average.
0.08Greencastle, Monday, 31 August
Climate normal for this date — 60-year average.
0.11Greencastle, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.08Greencastle, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.05Greencastle, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Greencastle, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Greencastle, Saturday, 5 September
Climate normal for this date — 60-year average.
0.21Greencastle, Sunday, 6 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 Greencastle, 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 Greencastle, 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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