WorkWindow

Outdoor Project Weather in Philadelphia, PA

This page runs Philadelphia's forecast against all six task rulesets at once. Verdicts load live above; the month-by-month matrix below — built from NOAA 1991–2020 normals — shows when each job's season opens. Lawn Seeding gets the most calendar here: 191 workable days a year.

Today at a glance

Verdicts load live from the 10-day forecast; without JavaScript this column stays blank and the year-round matrix below still answers the planning question.
TaskTodayBest months hereFull 10-day check
Deck Staining — Oct, Aug, Sep Stain a Deck in Philadelphia →
Exterior Painting — Oct, Aug, Sep Paint Outside in Philadelphia →
Driveway Sealing — Aug, Sep, Jul Seal a Driveway in Philadelphia →
Concrete Pouring — Oct, Aug, Sep Pour Concrete in Philadelphia →
Roof Coating — Oct, Aug, Sep Coat a Roof in Philadelphia →
Lawn Seeding — May, Oct, Apr Seed a Lawn in Philadelphia →

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for PHILA FRANKLIN INST, PA US. Darker = more workable days.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deck Staining 0 0 2 18 19 19 21 22 21 22 14 0
Exterior Painting 0 0 2 18 19 19 21 22 21 22 14 0
Driveway Sealing 0 0 0 3 19 19 21 22 21 13 0 0
Concrete Pouring 0 0 2 18 19 19 21 22 21 22 14 0
Roof Coating 0 0 2 18 19 19 21 22 21 22 14 0
Lawn Seeding 0 0 21 30 31 15 0 0 30 31 30 3

Season edges differ by task — that's the point of checking six at once. In Philadelphia the earliest opener starts around March and the last holdout closes after November. A week that fails the paint rules on humidity can still pass seeding, and a frost that ends concrete season leaves sealing untouched until nights slip under 50°F.

If you only open one full check, make it lawn seeding — Philadelphia's longest season at 191 workable days.

Full 10-day checks

Pennsylvania

Climatology: NOAA 1991–2020 normals via PHILA FRANKLIN INST, PA US (6.4 km from Philadelphia center); live outlook by Open-Meteo.