Calculated maturity dates based on a common hypothetical planting date and a 43°F base temperature indicated a 38 day spread in tomato maturity among 12 locations in California. In the inland valleys assumed maturity corresponded to the marine ventilation pattern. Isotherm patterns showed that the cooler longer season areas were in the delta at the confluence of the San Joaquin and Sacramento Rivers, and shorter season areas were in concentric zones on the perimeter of the delta.
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Stephen J. Warnock (1970) studied this question.