West Derry, Monday, 2 November, 07:44
Partly cloudy. Feels like 53°. High 70°, low 48°.
West Derry, Tuesday, 3 November
Mostly clear. High 73°, low 47°.
West Derry, Wednesday, 4 November
Partly cloudy. High 76°, low 47°.
West Derry, Thursday, 5 November
Rain. High 68°, low 52°.
West Derry, Friday, 6 November
Overcast. High 60°, low 47°.
West Derry, Saturday, 7 November
Light rain. High 52°, low 41°.
West Derry, Sunday, 8 November
Light rain. High 56°, low 35°.
West Derry, Monday, 9 November
Rain. High 46°, low 38°.
West Derry, Tuesday, 10 November
Light rain. High 43°, low 32°.
West Derry, Wednesday, 11 November
Overcast. High 45°, low 36°.
West Derry, Thursday, 12 November
Overcast. High 47°, low 33°.
West Derry, Friday, 13 November
Light rain. High 48°, low 36°.
West Derry, Saturday, 14 November
Light rain. High 41°, low 33°.
West Derry, Sunday, 15 November
Overcast. High 47°, low 32°.
West Derry, Monday, 16 November
Snow. High 42°, low 28°.
West Derry, Tuesday, 17 November
Light snow. High 38°, low 24°.
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 West Derry, PA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
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.
They are real temperature extremes recorded in West Derry, PA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.