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City guide · California

Outdoor Project Weather in Napa, CA

One forecast, six label checks. Today's verdict for every task in Napa loads above; the matrix below shows the whole year at a glance, computed from NOAA 1991–2020 normals at Napa State Hospital, Ca Us. The friendliest calendar here belongs to lawn seeding (359 workable days a year).

Six tasks · one forecast · California

JulyBest overall month
Lawn SeedingFriendliest task
1,600 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 Napa →
Exterior Painting	—	Aug, Jul, Sep	Paint Outside in Napa →
Driveway Sealing	—	Aug, Jul, Sep	Seal a Driveway in Napa →
Concrete Pouring	—	Aug, Jul, Sep	Pour Concrete in Napa →
Roof Coating	—	Aug, Jul, Sep	Coat a Roof in Napa →
Lawn Seeding	—	Jan, Mar, May	Seed a Lawn in Napa →

Keep the tour going — compare this calendar with Murrieta, CA behind you or Newport Beach, CA up next.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for NAPA STATE HOSPITAL, CA US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	10	18	21	23	27	29	31	31	29	27	22	6
Exterior Painting	10	18	21	23	27	29	31	31	29	27	22	6
Driveway Sealing	0	0	0	0	14	29	31	31	29	11	0	0
Concrete Pouring	10	18	21	23	27	29	31	31	29	27	22	6
Roof Coating	10	18	21	23	27	29	31	31	29	27	22	6
Lawn Seeding	31	29	31	30	31	30	31	31	23	31	30	31

Which task gets the most weather in Napa?

Lawn Seeding359days/yr
Deck Staining274days/yr
Exterior Painting274days/yr
Concrete Pouring274days/yr
Roof Coating274days/yr
Driveway Sealing145days/yr

The composite season in Napa opens around January 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 Napa (359 workable days a year), then work down the matrix.

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Full 10-day checks

California

Climatology: NOAA 1991–2020 normals via NAPA STATE HOSPITAL, CA US (3.9 km from Napa center); live outlook by Open-Meteo.