October 25, 2018
Total annual precipitation refers to the amount of water that fell from the sky in the last year. This includes rain and the water in snow, sleet, and hail. Precipitation plays an important role in plant survival, fire risk, insect outbreaks, and river levels.
For the Forest Health Index, we use the average amount of precipitation across the watershed. This approach gives a better sense of what is happening across the forested region as a whole, rather than looking at data from a single location.