Watertown, NY Weather Watertown, NY climate is mild during summer when temperatures tend to be in the 60's and extremely cold during winter when temperatures tend to be in the 10's. Over the course of the year, the temperature typically varies from 11°F to 79°F and is rarely below -10°F or above 86°F.. Based on the tourism score, the best time of year to visit Watertown for warm-weather activities is from late June to early September. February is in the winter in Watertown and is typically the 2nd coldest month of the year. The wettest month of the year is September with an average rainfall of 4.59 Inches. The coldest temperature recorded in Hawai'i is 12 degrees at the Mauna Kea Observatory, which is at an elevation of 13,796 feet, on May 17, 1979. The annual average precipitation at Watertown is 42.57 Inches.
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