Here are my thoughts based on your post

Observations:

1) You never mentioned a long winter, just bad weather days - which would lead me to assume you live in a temperate climate, and that you're talking rain, wind and such, and somewhat unpleasant temperatures.
2) You also mentioned that you like riding outside because you like seeing stuff.

Deduction - You are a casual/enthusiast rider who can afford to miss a day or two when its raining. If you were an uber competitive racing type, you would see nothing on your outdoor rides except the red mist of suffering and pain. You would also not be looking for alternate means to ride because of a bit of rain or wind.

Conclusion - No, you should not get a trainer.