How do you keep your styled hair in tact when you live in a rainy area?

I did a blowout the other day because I was meeting my bf's dad for the first time and wanted to look good, but by the time I got there my hair was frizzy and reverted back to it's natural curl pattern. I moved to western Canada (lower mainland) and I see people with styled hair whenever I'm out. What's the trick to having nice hair in this climate?