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USA National Phenology Network
May 9, 2016
You can now explore the USA-NPN's maps of accumulated temperature and start of spring in the Phenology Visualization Tool. See how much heat has accumulated in particular regions of the US, find out how this year's spring stacks up to previous years, and see how Nature's Notebook data compare to the date of first leaf or first bloom as estimated using the Extended Spring Indices. Learn more about these new maps or see them on the Visualization Tool.
This beautifully illustrated guide provides detailed information on stems, buds, roots, leaves, flowers and fruits to help you make your Nature's Notebook observations. Download a free copy of the Primer, or purchase a spiral-bound copy.