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City guide · Missouri

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).

Six tasks · one forecast · Missouri

SeptemberBest overall month
Lawn SeedingFriendliest task
870 task-daysWorkable task-days/yr
6Tasks tracked
Average of all six tasks

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.
Task	Today	Best months here	Full 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 →

City-to-city context helps: browse outdoor project weather in Lee's Summit, MO one stop back, or continue to Springfield, MO’s project calendar.

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.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
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

Which task gets the most weather in O'Fallon?

Lawn Seeding169days/yr
Deck Staining148days/yr
Exterior Painting148days/yr
Concrete Pouring148days/yr
Roof Coating148days/yr
Driveway Sealing109days/yr

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.

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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.