When is the best time to visit Iceland?

Most museums and attractions are only open from late May to early September, and it’s at these times, too, that buses run their fullest schedules.Between September and January the Aurora Borealis or Northern Lights can often be seen throughout the country. 

http://www.roughguides.com/destinations/europe/iceland/

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http://www.lonelyplanet.com/iceland/weather

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https://www.discover-the-world.co.uk/destinations/iceland-holidays/iceland-faqs

http://www.onthegotours.com/Iceland/Best-time-to-visit