We’re tracking temperatures (looking for frost) to protect our cherry trees now in spring.
We monitor the deepest part of the orchard, because the cold air flows downwards. And if temperatures go below zero we start water irrigation and fire big candles until the sun comes up and starts to heat the orchard again. I built a website where we can watch temperatures from the phone through the night. The code of the node you can find here, it still has a problem but is working for the season now. 
If you’re more interested in what my brother is doing on the farm, the Swiss TV was there (Swiss German only) two years ago, where the frost damage was nearly 95% (!).
An image of the irrigation system
