Many people tend to write down and keep track of certain annual events. These events may include the sighting of the first robin of spring, or if you live on a lake, the ice out date. For me in recent years, I have kept track of when some crabapple trees bloom. This recording of the timing of natural events is referred to as Phenology. The crabapple trees I have been watching for years have not yet bloomed but they will likely bloom this weekend. There have been other years without them blooming until May 27 or May 28. This means at least to the flowering trees; this spring has been similar or even warmer than some other springs in the past 20 years.