It's simply an average. If you got 4000 bushel of corn from 100 acres, you'd be getting an average of 40 bushel per acre. (4000/100=40). An acre is measure of area (of land), yield is simply the amount of something (crops) that is produced. Yield could be measured in whatever measurment is approprate for the crop: weight, volume, etc.
The highest monthly average temperature in Spartanburg for August is 80 degrees. The lowest monthly average temperature in Spartanburg for January is 44 degrees. The most monthly precipitation in Spartanburg occurs in December with 4.8 inches. The air quality index in Spartanburg is 19% better than the national average. The pollution index in Spartanburg is 52% worse than the national average.
Spartanburg is the largest city in and the county seat of Spartanburg County, South Carolina, United States, and the 12th-largest city by population in the state. The city of Spartanburg has a municipal population of 37,013, and Spartanburg County has an urban population of 180,786 as of the 2010 census.