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.
When to buy a used car. Seasonal trends in sales of new cars have a knock-on effect on the cost of used cars. March and September are the peak months for sales of new cars, often through part-exchange deals. So dealers will have lots of used cars to sell, which puts you in a strong position when negotiating.