The USDA Plant Hardiness Zone Map. Considered the standard measure of plant hardiness, the USDA Zone Map is generally is based on the average annual minimum winter temperature, divided into 10-degree F zones.
August may be a great time to buy certain kinds of cars, and the first couple of days of the month could be an opportune time to seal the deal. Then again, depending on the buyer and car model in question, those times might not be ideal to get the best price.
Another smart time to buy a new car is late summer or early fall, when new-model-year vehicles are rolling into dealers' inventories. This year, buyers may get an attractive deal on a 2013 model vehicle, provided the replacement 2014 models are already on the lot.