WorkWindow

Outdoor Project Weather in Portsmouth, NH

This page runs Portsmouth'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: 201 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 Portsmouth →
Exterior Painting — Aug, Sep, Jul Paint Outside in Portsmouth →
Driveway Sealing — Aug, Jul, Jun Seal a Driveway in Portsmouth →
Concrete Pouring — Aug, Sep, Jul Pour Concrete in Portsmouth →
Roof Coating — Aug, Sep, Jul Coat a Roof in Portsmouth →
Lawn Seeding — May, Jul, Aug Seed a Lawn in Portsmouth →

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for GREENLAND, NH US. Darker = more workable days.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deck Staining 0 0 0 0 19 19 20 22 21 11 0 0
Exterior Painting 0 0 0 0 19 19 20 22 21 11 0 0
Driveway Sealing 0 0 0 0 0 18 20 22 14 0 0 0
Concrete Pouring 0 0 0 0 19 19 20 22 21 11 0 0
Roof Coating 0 0 0 0 19 19 20 22 21 11 0 0
Lawn Seeding 0 0 0 14 31 30 31 31 30 31 3 0

Season edges differ by task — that's the point of checking six at once. In Portsmouth the earliest opener starts around April and the last holdout closes after October. 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 — Portsmouth's longest season at 201 workable days.

Full 10-day checks

New Hampshire

Climatology: NOAA 1991–2020 normals via GREENLAND, NH US (5.4 km from Portsmouth center); live outlook by Open-Meteo.