Longmont (CO) Sunshine Hours by Month

When exploring climate, sunlight hours tell an important story. This page shows the total number of hours of direct sunlight per month and the average hours per day in Longmont, Colorado, United States of America. These values are calculated using 30 years of data (1990–2020) to ensure accuracy.

Monthly hours of sunshine

Sunshine in Longmont varies greatly throughout the year. The sunniest month, July, reaches an impressive 323 hours, while November, the darkest month, offers only 195 hours. The total annual amount of sun is 3102 hours.

Daily hours of sunshine

Seasonal changes in sunshine hours are quite obvious in Longmont. 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.

Average percent of sunshine

On average the sun shines 73% of the time during the day in September, the highest percentage of any month. May has the lowest percentage at 65%.

Longmont enjoys an average of 3102 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.

Manchester, UK, experiences just around 1420 hours of sunshine annually.

Beijing, China, has 2505 hours of sunshine annually, with clear, sunny days in winter.

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

May, Longmont’s wettest month, receives 38 mm (1.5 in) of rainfall and has a maximum daytime temperature of 22°C (72°F). During the driest month January you can expect a temperature of 7°C (45°F).

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