all year round
Throughout the entire year, without regard to seasons. For example, Thanks to the indoor courts we can play tennis all year round. [Mid-1700s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for all year round
Stalking the unexpected is “an all-year-round, any-kind-of-weather sport,” she says.6 Secrets of Perfect Gift Giving
November 26, 2009