Princeton (NJ) Sunshine Hours by Month

Sunshine plays a big role in understanding the climate of a city. This page shows the total number of hours of direct sunlight per month and the average hours per day in Princeton, New Jersey, United States of America. These averages rely on historical data collected over 30 years, from 1990 to 2020.

Monthly hours of sunshine

Those who love seasonal contrasts will appreciate Princeton. Expect long, bright days with 269 hours in July and darker periods with just 140 hours in December. The total annual amount of sun is 2502 hours.

Daily hours of sunshine

In Princeton, summer days are longer and more sunny, with daily sunshine hours peaking at 9.0 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.7 hours per day.

Average percent of sunshine

On average the sun shines 59% of the time during the day in July, the highest percentage of any month. December has the lowest percentage at 48%.

Princeton enjoys an average of 2502 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, Brussels, Belgium, receives only about 1590 hours of sunshine per year, known for its frequently overcast and rainy skies.

In Chicago, USA, the annual sunshine averages 2520 hours, contributing to its humid continental climate.

In Brisbane, Australia, the annual sunshine averages 2999 hours, making it one of Australia’s sunniest cities.

July, Princeton’s wettest month, receives 138 mm (5.4 in) of rainfall and has a maximum daytime temperature of 31°C (88°F). During the driest month February you can expect a temperature of 5°C (41°F).

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