No, I'm not telling you to stop skateboarding and switch to another sport. What I mean with skateboarding alternatives is the things you can do with your skateboard when it is wet, raining, cold, and snowing.
First, a skateboard should not be kept in your house until spring or until the weather permits. There are lots of activities you can do with your skateboard aside from going out and hitting the sidewalks and parks.
Indoor skateboarding Do not ride your skateboard and chase your cats, dogs, and brothers around the house. That's not what I meant. What I mean is you can practice your tricks inside your house, in your room or on the carpet of your living room. You can practice your balance, kickflips, kickturns, ollies, and other freestyle tricks without going out of your house. Be careful though. You don't want to annoy your mom and dad with broken glasses, and windows.
Garage skateboard If your house is not good enough, you still have your garage. Clear out the cars and boxes and you are good to go. Transform your garage into your personal skate park. Construct a mini ramp and short rails. Skating in your garage is the best way to beat the rain, snow, and cold.
Indoor skate parks If you are doing all your skateboarding on the street and parking lots, then you may have forgotten all about indoor skate parks near you. Here, you can improve your skateboarding techniques regardless of the weather. It might cost you some money, but if you can afford to buy wheels and trucks, you can definitely afford to pay for the use of the park. After all, you are just paying here to survive over the winter months. When spring comes, go back to your favorite skate spot.
Snowboarding It's winter and the snow is falling. You can't roll but you can definitely slide. So, grab your snowboard and head to ski parks. If you don't have the money, your neighborhood is all yours. Remember this: many skateboarding tricks are derived from snowboarding so you can definitely improve your riding when you get back to your wheels in the spring.
Being a couch potato when you can't skateboard outside is really up to you. But if you want to improve your skills, be creative. Use every available space you have and get better each day.