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.
Manufacturers of stone blocks must source large pieces of stone and use special machines to cut those stones into small fence blocks. A natural stone wall will cost around $8 to $12 per square foot based on the type of stone chosen. A concrete block wall costs $6.10 to $7.60 per linear foot. Homeowners will also need to pay for any other materials needed, including steel bars, sand to keep the stones from rubbing against each other and mortar.