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POPSJune Hasn't Been This Nice Since ... 1913 Typically in June, high-pressure systems begin to form above the Valley. High pressure means clear skies and little wind. And, in June, clear skies let in the sunshine, sending the temperatures soaring. This June, though, has remained cool because of what Meyers called "a persistent area of low pressure off the West Coast." The low pressure has prevented the high-pressure systems from getting into place. Alas, all good things must come to an end. This weekend, the days will heat up. Temperatures are expected to be back in the 104-105 range by the middle of next week.