Abstract
Deciduous plants require chilling temperatures in winter in order to have normal renewed growth in spring. Since only limited California records of hourly temperatures exist, the more extensive records of maximum and minimum temperature, average relative humidity, and wet bulb temperature were used to derive empirical equations for estimating the extent of chilling occurring under various conditions. The average occurrence of chilling temperatures throughout California was then mapped for several periods. It was found to vary with height in a manner that differed slightly between the Sacramento and San Joaquin valleys. The effects of various environmental conditions are also discussed. High temperatures and solar radiation are shown to decrease, and clouds, shade and wind to increase the effectiveness of chilling temperatures.
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