We discuss dormancy and chilling with Katherine Jarvis-Shean, Orchard Systems Advisor in Yolo, Solano, and Sacramento Counties (AKA Yolanomento). She explains what we know about dormancy, how we calculate chill accumulation, and why we seem to be seeing more winters with poor chill accumulation recently.
You can find more about chill models and other weather related models at: http://fruitsandnuts.ucdavis.edu/Weather_Services/
To read the paper that shows that fog in the Central Valley has decreased by 50% since the 1980s, follow this link: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2014GL060018
Lastly, if you would like to see the map of projected chill accumulation in California, follow this link: http://treephenology.ucdavis.edu/chp/cac/results.html