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City guide · Illinois

Outdoor Project Weather in Decatur, IL

One forecast, six label checks. Today's verdict for every task in Decatur loads above; the matrix below shows the whole year at a glance, computed from NOAA 1991–2020 normals at Decatur Wtp, Il Us. The friendliest calendar here belongs to lawn seeding (236 workable days a year).

Six tasks · one forecast · Illinois

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

Keep the tour going — compare this calendar with Cicero, IL behind you or Elgin, IL up next.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for DECATUR WTP, IL US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	15	18	19	22	23	22	22	0	0
Exterior Painting	0	0	0	15	18	19	22	23	22	22	0	0
Driveway Sealing	0	0	0	0	16	19	22	23	22	3	0	0
Concrete Pouring	0	0	0	15	18	19	22	23	22	22	0	0
Roof Coating	0	0	0	15	18	19	22	23	22	22	0	0
Lawn Seeding	0	0	9	30	31	30	31	31	30	31	13	0

Which task gets the most weather in Decatur?

Lawn Seeding236days/yr
Deck Staining141days/yr
Exterior Painting141days/yr
Concrete Pouring141days/yr
Roof Coating141days/yr
Driveway Sealing105days/yr

The composite season in Decatur opens around March and closes after November: 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 Decatur (236 workable days a year), then work down the matrix.

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Full 10-day checks

Illinois

Climatology: NOAA 1991–2020 normals via DECATUR WTP, IL US (3.3 km from Decatur center); live outlook by Open-Meteo.