WorkWindow

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.

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.
TaskTodayBest months hereFull 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 →

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.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
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

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.

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.