There are two reasons for this.
1. People would insure their bike for the summer, but use the slip and ride in the off season when the weather suited them. Because of the amount of uninsured riders running around in November months, they made it mandatory for year round insurance.
2. The insurance companies want to make more money that way. Insurance pay outs drop drastically in the winter, yet the reap all the profits in monthly premium;s.
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