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.
1 The average temperature in Durban, South Africa is warm at 20.5 degrees Celsius (68.8 degrees Fahrenheit). 2  The variation of mean monthly temperatures is 8 C (14.4F) which is a very low range.  The mean diurnal temperature variation/ range is 8.3 C (14.9 F).