The Weather Stress Index, or WSI, is a relative measure of the weather conditions, often used as a comfort indicator. The index, a number between 0 and 100, represents the percentage of time in the past with temperatures below the current temperature, for a given location, day and time.
Best Answer:  A free lease means that the horse is leased to someone without any payment to the owner. Now, depending on the contract, the person leasing the horse may have to pay for board, vet, farrier, etc. although some lease agreements may require the owner to pay those bills.
In the share-lease, boarding expenses are split between two individuals (usually the horse's owner and the lessee), in exchange for the lessee to care and ride for the horse 50% of the time. If you'd like to get involved in a share-lease, be sure that everything is clearly understood and written in a contract first.