c.1300, impose a tax on, from Old French taxer impose a tax (13c.), from Latin taxare evaluate, estimate, assess, handle, also censure, charge, probably a frequentative form of tangere to touch (see tangent). Sense of burden, put a strain on first recorded 1670s; that of censure, reprove is from 1560s.
The average depth of frost penetration ranges from 25 inches (64 cm) in southwestern South Dakota to 50 inches (127 cm) in. the northeast. Depth of frost depends on the amount of residue cover, soil moisture content, and the amount and timing of. snowfalls in relation to temperature extremes.
I always thought that below the frost line, the ground temperature stays pretty much consitant, around 50 degree F. I would guess these numbers are for temeratures within 25 or 30 feet of the surface, I would be very much suprised that these number hold true for depths deeper than that.or example the average air temp over the course of 1 year might be 65 F in the south and so the average ground temperature will be about 65. In a northern clime with an average air temp of 45 F the average ground temp will be 45F.