In the spring you often get a lot more rain then you do in the fall. In addition, the rain comes down very heavily. Heavy rain is nice, because it cleans off your roof, but the downside it that often most of the debris gets trapped in your gutters and then causes them to over flow. If you clean your gutters in the Spring you can keep this from happening. Spring gutter cleaning is less tedious and a lot more enjoyable then cleaning them in the winter. You can typically do it in half the time. Spring gutter cleaning will allow you to have clean, dry gutters all Spring and summer. This will mean that the gutter on your roof will probably last a lot longer and they won't need to be repair your replaced.
Another reason to clean them clean in the Spring it to keep weeds (and trees) from growing out of your gutter. To often, weeds and tree seeds that have blown onto your roof, start growing out of your gutters. Not only can this be embarrassing, but it can also cause damage to your gutters and down spouts. Therefore, cleaning out your gutters on a regular basis will prevent them from getting damaged or from having to be replaced and is very import to do even in the spring.