Rockville (MD) 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 Rockville, Maryland, United States of America. These averages rely on historical data collected over 30 years, from 1990 to 2020.

Monthly hours of sunshine

If you're visiting Rockville, timing is key. In June, you can enjoy up to 282 hours of sunshine, while the shorter days of December provide just 130 hours. The total annual amount of sun is 2520 hours.

Daily hours of sunshine

For those who appreciate different seasons, Rockville serves as an ideal destination. Expect longer, more sun-filled days in June with an average of 9.4 hours of sunshine daily, and embrace the darker days in December, offering only 4.3 hours of daily sunlight.

Average percent of sunshine

On average the sun shines 64% of the time during the day in June, the highest percentage of any month. December has the lowest percentage at 45%.

Rockville enjoys an average of 2520 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.

In contrast, Tromsø , Norway, receives only about 1270 hours of sunshine per year, known for the polar night with no sunlight for weeks during winter.

Stockholm, Sweden, receives approximately 1907 hours of sunshine annually.

Melbourne, Australia, has 2380 hours of sunshine annually, with its famous “four seasons in a day” weather pattern.

October, Rockville’s wettest month, receives 88 mm (3.5 in) of rainfall and has a maximum daytime temperature of 19°C (66°F). During the driest month February you can expect a temperature of 6°C (43°F).

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