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.
Leasing should be an enjoyable learning and growing experience. The horse must be compatible to your abilities as a rider. The temperament of a horse can make a big difference to an inexperienced rider. If you lease a horse with a good attitude, riding will be safe and fun. A horse that you are not able to handle can lead to a bad experience for both you and the horse.