Average Monthly Sunshine in Boulder (CO)

The graphs on this page shows the average number of hours per month and per day that Boulder 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 Boulder, timing is key. In July, you can enjoy up to 323 hours of sunshine, while the shorter days of November provide just 195 hours. The total annual amount of sun is 3100 hours.

Daily hours of sunshine

Seasonal changes in sunshine hours are quite obvious in Boulder. While July receives considerable daily sunshine with up to 10.8 hours, November marks the darkest time of the year, where sunshine is scarce with only 6.5 hours of sunlight per day.

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

Boulder enjoys an average of 3100 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Athens, Greece, enjoys 2769 hours of sunshine each year, making it one of the sunniest destinations in the Mediterranean region.

Toronto, Canada, sees around 2071 hours of sunshine each year, with especially long, bright summer days.

In Shanghai, China, the annual average sunshine is 1780 hours, with cloudier weather in summer.

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

Other climate information

May, Boulder’s wettest month, receives 53 mm of rainfall and has a maximum daytime temperature of 21°C. During the driest month January you can expect a temperature of 8°C.

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