Weather in Chatham, PA
Chatham, Tuesday, 20 October, 10:04
Clear. Feels like 50°. High 61°, low 36°.
Monthly outlook for Chatham, PA: average high 53.1°, average low 32.7°. That is 0.8° below the climate normal for October. Precipitation is expected on 3 days (about 0.2 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 25 October (64.6°), the coolest 31 October (23.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 56.5° | 55.3° | +0.7° |
| 30 October – 8 November | 47.5° | 52.1° | -2.6° |
| 9 November – 18 November | at normal | 46.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Nelson (11 mi).
0Chatham, Wednesday, 21 October
Clear. High 60°, low 29°.
0
Chatham, Thursday, 22 October
Overcast. High 56°, low 29°.
0
Chatham, Friday, 23 October
Partly cloudy. High 50°, low 35°.
0Chatham, Saturday, 24 October
Clear. High 60°, low 31°.
0
Chatham, Sunday, 25 October
Mostly clear. High 65°, low 38°.
0Chatham, Monday, 26 October
Overcast. High 64°, low 46°.
0.1
Chatham, Tuesday, 27 October
Snow. High 59°, low 37°.
0Chatham, Wednesday, 28 October
Overcast. High 42°, low 28°.
0Chatham, Thursday, 29 October
Overcast. High 48°, low 26°.
0.05Chatham, Friday, 30 October
Light snow. High 40°, low 28°.
0Chatham, Saturday, 31 October
Clear. High 45°, low 23°.
0Chatham, Sunday, 1 November
Overcast. High 46°, low 35°.
0.02
Chatham, Monday, 2 November
Light rain. High 50°, low 34°.
0Chatham, Tuesday, 3 November
Overcast. High 53°, low 32°.
0.07Chatham, Wednesday, 4 November
Light rain. High 51°, low 36°.
0.08
Chatham, Thursday, 5 November
Climate normal for this date — 60-year average.
0.08Chatham, Friday, 6 November
Climate normal for this date — 60-year average.
0.08Chatham, Saturday, 7 November
Climate normal for this date — 60-year average.
0.11Chatham, Sunday, 8 November
Climate normal for this date — 60-year average.
0.09Chatham, Monday, 9 November
Climate normal for this date — 60-year average.
0.12Chatham, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.12Chatham, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.15Chatham, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Chatham, Friday, 13 November
Climate normal for this date — 60-year average.
0.11Chatham, Saturday, 14 November
Climate normal for this date — 60-year average.
0.12Chatham, Sunday, 15 November
Climate normal for this date — 60-year average.
0.13Chatham, Monday, 16 November
Climate normal for this date — 60-year average.
0.11Chatham, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.07Chatham, Wednesday, 18 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 Chatham, 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 Chatham, 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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