Iselin (NJ) 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 Iselin, New Jersey, United States of America. Long-term data from 1990 to 2020 was used to calculate these averages.

Monthly hours of sunshine

Seasonal sunshine in Iselin varies. It peaks at 271 hours in July and drops to 141 hours in December. The total annual amount of sun is 2544 hours.

Daily hours of sunshine

In Iselin, 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 63% of the time during the day in August, the highest percentage of any month. December has the lowest percentage at 48%.

Iselin enjoys an average of 2544 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.

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

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

December, Iselin’s wettest month, receives 111 mm (4.4 in) of rainfall and has a maximum daytime temperature of 8°C (46°F). During the driest month November you can expect a temperature of 13°C (55°F).

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