Castlebar 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 Castlebar, Mayo, Ireland. The figures are based on a 30-year period (1990–2020) to provide a reliable average.

Monthly hours of sunshine

If you're visiting Castlebar, timing is key. In May, you can enjoy up to 157 hours of sunshine, while the shorter days of December provide just 35 hours. The total annual amount of sun is 1114 hours.

Daily hours of sunshine

This means the city can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 5.2 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.2 hours of sunlight per day.

Average percent of sunshine

On average the sun shines 39% of the time during the day in May, the highest percentage of any month. December has the lowest percentage at 17%.

Castlebar enjoys an average of 1114 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

The city of Rome, Italy, experiences 2470 hours of sunshine annually, adding to its charm as a year-round tourist destination.

In contrast, London, UK, receives only about 1659 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.

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

December, Castlebar’s wettest month, receives 105 mm (4.1 in) of rainfall and has a maximum daytime temperature of 9°C (48°F). During the driest month April 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 Castlebar Precipitation page.