Dave Wilson says "Hours Below 45°F " equates to chilling hours. For all the people who don’t understand here is more information Fruit Tree Chilling Requirement | Dave Wilson Nursery. Abate fetel are considered high chill by those in warm climates but they are grown in south Africa, Brasil, Italy and other warm locations. They are said to take 600 to 1000 chill hours. european-pear-varieties.pdf (538.8 KB)
More on abate fetel
https://www.researchgate.net/publication/278009182_226_Prohexadione-Ca_Growth_Regulation_and_Reduction_of_Fire_Blight_Incidence_in_Pears_cv_Abate_Fetel’
https://www.jdvandeventerkwekery.com/pears-abate-fetel
Many places used to have these documented as very low chill pears but I see nothing like that now. " The Abate Fetel was developed in Italy by a monk who must’ve been promoted to abbot – Abate. And yes this pear looks like an abbot’s hat." . Bringing this up because abate fetel is parthenocarpic so pollination may not be a factor in California. For those not familiar Parthenocarpic Pears