Guerneville (CA) Sunshine Hours by Month

The amount of sunshine is fundamental to comprehending a place's climate. This page shows the total number of hours of direct sunlight per month and the average hours per day in Guerneville, California, United States of America. The figures are based on a 30-year period (1990–2020) to provide a reliable average.

Monthly hours of sunshine

Seasonal sunshine in Guerneville varies. It peaks at 310 hours in May and drops to 160 hours in December. The total annual amount of sun is 3042 hours.

Daily hours of sunshine

Seasonal changes in sunshine hours are quite obvious in Guerneville. While May receives considerable daily sunshine with up to 10.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.3 hours of sunlight per day.

Average percent of sunshine

On average the sun shines 79% of the time during the day in April, the highest percentage of any month. December has the lowest percentage at 55%.

Guerneville enjoys an average of 3042 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

In Lisbon, Portugal, there are approximately 2801 hours of sunshine annually, highlighting its warm and sunny Mediterranean climate.

In contrast, Reykjavík, Iceland, receives only about 1330 hours of sunshine per year, known for its frequently overcast and rainy skies.

In Seoul, South Korea, there are approximately 2133 hours of sunshine per year, mostly during spring and autumn.

Adelaide, Australia, enjoys 2770 hours of sunshine annually, with long, sunny summers.

December, Guerneville’s wettest month, receives 0.9 mm (0.04 in) of rainfall and has a maximum daytime temperature of 14°C (57°F). During the driest month July you can expect a temperature of 28°C (82°F).

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