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TIL that the USDA hardiness zones are each a ten-degree band of average minimum temperature in the fahrenheit scale, and the “a” and “b” suffixes break each zone down further into 5 degree ranges. (en.m.wikipedia.org)

submitted 2 years ago* (last edited 2 years ago) by scarabic to c/gardening

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I guess I thought they were more like distinct biomes but it really is just uniform chunks of temperature range. I also didn’t know that they were defined by the US Department of Agriculture, who created the first such system to help gardeners. There are similar maps for Australia, Canada, and parts of Europe, but no single global system. What’s your zone?

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[–] scarabic 2 points 2 years ago

Ah sure enough! It’s even mentioned in the Wikipedia page I posted but I missed it. Thanks!

In addition, the Köppen climate classification system can be used as a more general guide to growing conditions when considering large areas of the Earth's surface or attempting to make comparisons between different continents.[14] The Trewartha climate classification is often a good "real world" concept of climates and their relation to plants and their average growing conditions.[citation needed]