Average Monthly Sunshine in Napa (CA)

The graphs on this page shows the average number of hours per month and per day that Napa receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine

If you're visiting Napa, timing is key. In May, you can enjoy up to 310 hours of sunshine, while the shorter days of December provide just 160 hours. The total annual amount of sun is 0 hours.

Daily hours of sunshine

This means the city can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.3 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.3 hours of sunlight per day.

Napa’s total hours of sunshine compared to other major cities

Napa enjoys an average of 0 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

In Barcelona, Spain, there are 2530 hours of sunshine annually and is a city that can be visited year-round.

Boston, USA, enjoys 2629 hours of sunshine annually, with distinct seasons and many bright, sunny days.

Vancouver, Canada, receives approximately 1940 hours of sunshine annually.

Perth, Australia, enjoys 3180 hours of sunshine annually, the highest among major Australian cities.

Other climate information

December, Napa’s wettest month, receives 3.8 mm of rainfall and has a maximum daytime temperature of 14°C. During the driest month July you can expect a temperature of 29°C.

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Napa Precipitation page.