Average Monthly Sunshine in Alton (IL)

The graphs on this page shows the average number of hours per month and per day that Alton receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine

Sunshine in Alton varies greatly throughout the year. The sunniest month, July, reaches an impressive 311 hours, while December, the darkest month, offers only 128 hours. The total annual amount of sun is 2612 hours.

Daily hours of sunshine

This means the city can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.4 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.3 hours of sunlight per day.

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

Alton enjoys an average of 2612 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.

Boston, USA, enjoys 2629 hours of sunshine annually, with distinct seasons and many bright, sunny days.

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

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

Other climate information

April, Alton’s wettest month, receives 102 mm of rainfall and has a maximum daytime temperature of 19°C. During the driest month January you can expect a temperature of 4°C.

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