First and foremost, you need to recognize that the day's temperature is different from precipitation. It might seem like a beautiful idea to go for a ride as fresh snow coats the ground turning everything beautiful and white. Unless you have proper tires and know-how, riding a bike through snow is often dangerous. Bikes tend to fishtail in deeper snow, making it hard to balance and stay straight. This problem is worse for a bicycle than a tricycle. Adults should take precautions regardless of the type of bike or trike they ride.
It would help if you stayed warm, but not too warm. Feeling cold is the quickest way to end a bike or adult tricycle ride during the winter, so you need to make sure to dress appropriately. Avoid over-dressing in heavy, bulky clothing. When you get too hot, you'll sweat, which causes your base layer of clothing to get wet and cold: hence making you cold and wet. When wearing bulky clothing, movement and sight get obstructed, and reaction time is significantly slowed. When riding a cargo bike, the rider needs to be vigilant and react quickly. Consider wearing several thin layers as opposed to one or two bulky items.