You got it all wrong. You can wear a rain poncho when it rains. But you can't carry an A/C to cycle through the Greek summer (33C+).
Plus, rainy weather can be predicted pretty accurately with some investment. NL/BE have realtime notifications for incoming rainfall. And at least in NL the weather is extremely volatile (no mountains). Countries with more stable weather can surely do the same.
May I invite everyone with weather that has occasional showers to search for 'rain radar' and their region. If the rain patches are wind driven, you can easily predict the time and length of a break and stay dry as long as you're a little flexible.
Plus, rainy weather can be predicted pretty accurately with some investment. NL/BE have realtime notifications for incoming rainfall. And at least in NL the weather is extremely volatile (no mountains). Countries with more stable weather can surely do the same.