That's what Bob Brendler wrote back in 1988.  Bob was the Veg Crops/Strawberry Advisor in Ventura County for 40 years and was a student of the weather.  He loved data and was the first in our office to computerize in the 70s.  Before he would crank out data on a calculator.  Literally, a big old hand crank calculator..  It went to three decimal points.

Here's his article and the results of the study he did on how cold winters had been over time. He looked at the number of days that orchard heaters were "fired" up in order to evaluate the cold for that winter.  He showed that winters since 1945 were getting warmer.  And they still are.

For years, Terry Schaeffer did frost forecasting for the Ventura area.  He knew every cold spot in the county.  We don't have that on the ground experience to tell us what to expect now, but there are still some decent forecasts out there for growers.

If you are looking for current frost forecasts, go to the California Citrus Mutual website for the Central Valley, Ventura and Desert forecasts.

https://www.cacitrusmutual.com/industry/weather-watch/

 And check out our blog on preparing for winter

https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=44155