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City guide · Illinois

Outdoor Project Weather in Springfield, IL

This page runs Springfield'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.

Six tasks · one forecast · Illinois

AugustBest overall month
Lawn SeedingFriendliest task
826 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 Springfield →
Exterior Painting	—	Aug, Sep, Jul	Paint Outside in Springfield →
Driveway Sealing	—	Aug, Sep, Jul	Seal a Driveway in Springfield →
Concrete Pouring	—	Aug, Sep, Jul	Pour Concrete in Springfield →
Roof Coating	—	Aug, Sep, Jul	Coat a Roof in Springfield →
Lawn Seeding	—	May, Aug, Oct	Seed a Lawn in Springfield →

City-to-city context helps: browse outdoor project weather in Round Lake Beach, IL one stop back, or continue to Waukegan, IL’s project calendar.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for SPRINGFIELD #2, IL US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	11	19	19	21	23	22	19	0	0
Exterior Painting	0	0	0	11	19	19	21	23	22	19	0	0
Driveway Sealing	0	0	0	0	15	19	21	23	21	0	0	0
Concrete Pouring	0	0	0	11	19	19	21	23	22	19	0	0
Roof Coating	0	0	0	11	19	19	21	23	22	19	0	0
Lawn Seeding	0	0	2	30	31	25	2	31	30	31	9	0

Which task gets the most weather in Springfield?

Lawn Seeding191days/yr
Deck Staining134days/yr
Exterior Painting134days/yr
Concrete Pouring134days/yr
Roof Coating134days/yr
Driveway Sealing99days/yr

Season edges differ by task — that's the point of checking six at once. In Springfield the earliest opener starts around April 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 — Springfield's longest season at 191 workable days.

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Full 10-day checks

Illinois

Climatology: NOAA 1991–2020 normals via SPRINGFIELD #2, IL US (3.5 km from Springfield center); live outlook by Open-Meteo.