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City guide · Connecticut

Outdoor Project Weather in New Haven, CT

This page runs New Haven'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: 231 workable days a year.

Six tasks · one forecast · Connecticut

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

City-to-city context helps: browse outdoor project weather in Hartford, CT one stop back, or continue to Norwalk, CT’s project calendar.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for NEW HAVEN TWEED AP, CT US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	8	18	19	20	21	21	20	0	0
Exterior Painting	0	0	0	8	18	19	20	21	21	20	0	0
Driveway Sealing	0	0	0	0	8	19	20	21	21	3	0	0
Concrete Pouring	0	0	0	8	18	19	20	21	21	20	0	0
Roof Coating	0	0	0	8	18	19	20	21	21	20	0	0
Lawn Seeding	0	0	0	28	31	30	31	31	30	31	19	0

Which task gets the most weather in New Haven?

Lawn Seeding231days/yr
Deck Staining127days/yr
Exterior Painting127days/yr
Concrete Pouring127days/yr
Roof Coating127days/yr
Driveway Sealing92days/yr

Season edges differ by task — that's the point of checking six at once. In New Haven 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 — New Haven's longest season at 231 workable days.

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Full 10-day checks

Connecticut

Climatology: NOAA 1991–2020 normals via NEW HAVEN TWEED AP, CT US (6.5 km from New Haven center); live outlook by Open-Meteo.