It seems like every day, I discover another really useful tool that the National Oceanographic and Atmospheric Agency (NOAA) produces. A part of the Department of Commerce (odd, huh?), most people know them as the hurricane monitoring folks. However, they encompass an alphabet-soup of centers and services. The National Climactic Data Center (NCDC)’s Sattelite and Information Service (NSIS), has an easy to navigate website containing (virtual) reams of freeze/frost data. You can download the PDF of your state (I downloaded Maryland, which contained the DC Metro area data). They provide the probabilities of frost for “three temperatures (36, 32, and 28 °f) at three probability levels (10, 50, and 90 percent).” Looks like I’ll have to watch my seedlings. We’ve had an unusually warm spring and they’ve been outside for two weeks now – at first only during the day, but for the past week I’ve left them out at
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