WorkWindow

Outdoor Project Weather in O'Fallon, MO

One forecast, six label checks. Today's verdict for every task in O'Fallon loads above; the matrix below shows the whole year at a glance, computed from NOAA 1991–2020 normals at Weldon Spring Nws, Mo Us. The friendliest calendar here belongs to lawn seeding (169 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 — Aug, Sep, Jul Stain a Deck in O'Fallon →
Exterior Painting — Aug, Sep, Jul Paint Outside in O'Fallon →
Driveway Sealing — Aug, Sep, Jul Seal a Driveway in O'Fallon →
Concrete Pouring — Aug, Sep, Jul Pour Concrete in O'Fallon →
Roof Coating — Aug, Sep, Jul Coat a Roof in O'Fallon →
Lawn Seeding — May, Oct, Apr Seed a Lawn in O'Fallon →

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for WELDON SPRING NWS, MO US. Darker = more workable days.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deck Staining 0 0 0 16 19 20 23 23 23 23 1 0
Exterior Painting 0 0 0 16 19 20 23 23 23 23 1 0
Driveway Sealing 0 0 0 0 18 20 23 23 23 2 0 0
Concrete Pouring 0 0 0 16 19 20 23 23 23 23 1 0
Roof Coating 0 0 0 16 19 20 23 23 23 23 1 0
Lawn Seeding 0 0 10 30 31 20 0 2 30 31 15 0

The composite season in O'Fallon opens around March and closes after October: coatings wait on warm nights, concrete on freeze-free 48-hour stretches, seeding on the 55–80°F germination band. Between those bookends, the right question is which task fits this week — which is what the verdicts above answer.

Deepest calendar first: start with lawn seeding in O'Fallon (169 workable days a year), then work down the matrix.

Full 10-day checks

Missouri

Climatology: NOAA 1991–2020 normals via WELDON SPRING NWS, MO US (10.0 km from O'Fallon center); live outlook by Open-Meteo.