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Here is your 90 day "predictions" (aka weather guessers guesses)
https://www.accuweather.com/en/us/san-jose-ca/95110/december-weather/347630?monyr=12/1/2018&view=table
https://www.accuweather.com/en/us/san-jose-ca/95110/december-weather/347630?monyr=12/1/2018&view=table