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City guide · Illinois

Outdoor Project Weather in Alton, IL

One forecast, six label checks. Today's verdict for every task in Alton loads above; the matrix below shows the whole year at a glance, computed from NOAA 1991–2020 normals at Alton - Melvin Price L&D, Il Us. The friendliest calendar here belongs to lawn seeding (179 workable days a year).

Six tasks · one forecast · Illinois

SeptemberBest overall month
Lawn SeedingFriendliest task
936 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, Jul, Sep	Stain a Deck in Alton →
Exterior Painting	—	Aug, Jul, Sep	Paint Outside in Alton →
Driveway Sealing	—	Aug, Jul, Sep	Seal a Driveway in Alton →
Concrete Pouring	—	Aug, Jul, Sep	Pour Concrete in Alton →
Roof Coating	—	Aug, Jul, Sep	Coat a Roof in Alton →
Lawn Seeding	—	May, Oct, Apr	Seed a Lawn in Alton →

City-to-city context helps: browse outdoor project weather in Nampa, ID one stop back, or continue to Aurora, IL’s project calendar.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for ALTON - MELVIN PRICE L&D, IL US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	20	20	21	24	24	23	23	4	0
Exterior Painting	0	0	0	20	20	21	24	24	23	23	4	0
Driveway Sealing	0	0	0	1	20	21	24	24	23	8	0	0
Concrete Pouring	0	0	0	20	20	21	24	24	23	23	4	0
Roof Coating	0	0	0	20	20	21	24	24	23	23	4	0
Lawn Seeding	0	0	15	30	31	19	0	4	30	31	19	0

Which task gets the most weather in Alton?

Lawn Seeding179days/yr
Deck Staining159days/yr
Exterior Painting159days/yr
Concrete Pouring159days/yr
Roof Coating159days/yr
Driveway Sealing121days/yr

The composite season in Alton 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 Alton (179 workable days a year), then work down the matrix.

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Full 10-day checks

Illinois

Climatology: NOAA 1991–2020 normals via ALTON - MELVIN PRICE L&D, IL US (4.1 km from Alton center); live outlook by Open-Meteo.