Weather in Mount Gretna, PA
Mount Gretna, Wednesday, 21 October, 07:59
Clear. Feels like 36°. High 65°, low 40°.
Monthly outlook for Mount Gretna, PA: average high 60°, average low 43°. That is 0.6° above the climate normal for October. Precipitation is expected on 3 days (about 0.8 inches), against a normal of 4 days and 1.9 inches. The warmest day looks like 27 October (65.8°), the coolest 31 October (32.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 61.1° | 59.6° | +0.9° |
| 31 October – 9 November | 58.1° | 56.6° | +0.9° |
| 10 November – 19 November | at normal | 51.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Lebanon (7 mi).
0Mount Gretna, Thursday, 22 October
Clear. High 65°, low 35°.
0Mount Gretna, Friday, 23 October
Clear. High 57°, low 42°.
0
Mount Gretna, Saturday, 24 October
Partly cloudy. High 57°, low 36°.
0Mount Gretna, Sunday, 25 October
Clear. High 60°, low 36°.
0Mount Gretna, Monday, 26 October
Clear. High 63°, low 40°.
0
Mount Gretna, Tuesday, 27 October
Overcast. High 66°, low 48°.
0Mount Gretna, Wednesday, 28 October
Overcast. High 62°, low 47°.
0.02
Mount Gretna, Thursday, 29 October
Light rain. High 65°, low 47°.
0Mount Gretna, Friday, 30 October
Overcast. High 51°, low 38°.
0Mount Gretna, Saturday, 31 October
Clear. High 49°, low 33°.
0Mount Gretna, Sunday, 1 November
Light rain. High 52°, low 33°.
0.56Mount Gretna, Monday, 2 November
Rain. High 60°, low 47°.
0.12Mount Gretna, Tuesday, 3 November
Light rain. High 61°, low 52°.
0.07Mount Gretna, Wednesday, 4 November
Light rain. High 64°, low 57°.
0Mount Gretna, Thursday, 5 November
Light rain. High 63°, low 56°.
0.07Mount Gretna, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Mount Gretna, Saturday, 7 November
Climate normal for this date — 60-year average.
0.17
Mount Gretna, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1
Mount Gretna, Monday, 9 November
Climate normal for this date — 60-year average.
0.17Mount Gretna, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.13Mount Gretna, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.17Mount Gretna, Thursday, 12 November
Climate normal for this date — 60-year average.
0.09Mount Gretna, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Mount Gretna, Saturday, 14 November
Climate normal for this date — 60-year average.
0.12Mount Gretna, Sunday, 15 November
Climate normal for this date — 60-year average.
0.16Mount Gretna, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Mount Gretna, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.09Mount Gretna, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.1Mount Gretna, Thursday, 19 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 Mount Gretna, 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 Mount Gretna, 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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