Examples of use of rain or shine
1. "Then in the afternoon we walk along the beach – rain or shine it doesn‘t bother us.
2. Rain or shine, it’s hard to put down the hardy Mumbaikar.
3. The family holiday there every year, rain or shine, and admit to loving the free and easy caravan lifestyle.
4. It keeps profiting from waste, come rain or shine." (Reporting by Robin Pomeroy; editing by Robert Woodward)
5. It was a rain–or–shine spectacle, with people flashing plenty of bare skin despite the raw weather _ no deterrent to beaming spectators lining the route.