In 2003, Forster and Solomon (Observations of a weekend effect in diurnal temperature range, PNAS, [ http://www.pnas.org/content/100/20/11225.full ]) reported: we find evidence of a weekly cycle in diurnal temperature range (DTR) for many stations in the United States, Mexico, Japan, and China.
The total cost to have a concrete retaining wall installed will be a combination of material and labor prices. For a basic wall you can expect to pay between $30 and $40 per square foot.
Basic, construction-grade concrete costs about $5 to $10 per square foot, including installation. Opting for fancier, decorative versions such as stamped or colored concrete will add several dollars per square foot to the price. Very high-end concrete could cost as much as $15 per square foot.