Weather in Johnston, PA
Johnston, Friday, 9 October, 17:38
Overcast. Feels like 68°. High 72°, low 45°.
Monthly outlook for Johnston, PA: average high 66.3°, average low 46°. That is 1° above the climate normal for October. Precipitation is expected on 4 days (about 3.0 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 13 October (80.4°), the coolest 19 October (30.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 69.4° | 65.6° | +2.1° |
| 19 October – 28 October | 61.1° | 61.6° | -0.3° |
| 29 October – 7 November | at normal | 58.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Hagerstown (8 mi).
0Johnston, Saturday, 10 October
Overcast. High 73°, low 48°.
1.94
Johnston, Sunday, 11 October
Heavy rain. High 65°, low 51°.
0.54Johnston, Monday, 12 October
Heavy rain. High 74°, low 59°.
0
Johnston, Tuesday, 13 October
Partly cloudy. High 80°, low 55°.
0Johnston, Wednesday, 14 October
Partly cloudy. High 79°, low 64°.
0
Johnston, Thursday, 15 October
Clear. High 65°, low 53°.
0.31Johnston, Friday, 16 October
Rain. High 75°, low 54°.
0.16Johnston, Saturday, 17 October
Rain. High 58°, low 42°.
0
Johnston, Sunday, 18 October
Mostly clear. High 52°, low 35°.
0Johnston, Monday, 19 October
Overcast. High 52°, low 30°.
0Johnston, Tuesday, 20 October
Overcast. High 56°, low 37°.
0Johnston, Wednesday, 21 October
Clear. High 59°, low 36°.
0Johnston, Thursday, 22 October
Clear. High 63°, low 38°.
0Johnston, Friday, 23 October
Clear. High 69°, low 43°.
0Johnston, Saturday, 24 October
Clear. High 68°, low 46°.
0.16Johnston, Sunday, 25 October
Climate normal for this date — 60-year average.
0.11Johnston, Monday, 26 October
Climate normal for this date — 60-year average.
0.15Johnston, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.08Johnston, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.21Johnston, Thursday, 29 October
Climate normal for this date — 60-year average.
0.09Johnston, Friday, 30 October
Climate normal for this date — 60-year average.
0.07Johnston, Saturday, 31 October
Climate normal for this date — 60-year average.
0.06Johnston, Sunday, 1 November
Climate normal for this date — 60-year average.
0.14
Johnston, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Johnston, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Johnston, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.11Johnston, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Johnston, Friday, 6 November
Climate normal for this date — 60-year average.
0.09Johnston, Saturday, 7 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 Johnston, 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 Johnston, 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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