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.
Most full leases ask you to pay for 50% to 100% of the horse's board fees in addition to a lease fee. Lease fees are usually very negotiable. The full lease fee should be in the range of 25% to 30% of the horse's total value per year. So, if the horse is worth $10,000, the lessee will usually pay about $2,500 per year. The share-lease is usually less complicated in payments, because it is usually equal to  of the horse's boarding fees.