SDCL § 62-4-27: Seasonal employment--Determination of average weekly wage.

As to employees in employments in which it is the custom to operate for a part of the whole number of working days in each year, the average weekly wages shall be ascertained by multiplying the employee's average day's earnings by number of days which it is customary in such employment to operate during a year, but not less than two hundred, and dividing by fifty-two.