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National Weather Service records indicate that the high temperature in Juneau on June First averages 59 degrees and the high on the last day of the month averages 63 degrees.ational Weather Service historical Juneau June Weather data indicates that on June 3, 1972, the recorded high did not exceed 45 degrees Fahrenheit, the lowest high measured in Juneau in the past 66 years.
Earlier records are either unavailable or unreliable. Juneau, Alaska has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by tundra (37%), oceans and seas (34%), and forests (28%).rom the start to the end of the month, the length of the day decreases by 1:37 hours, implying an average day-over-day decrease of 3.1 minutes. The shortest day of the month is July 31 with 16:31 hours of daylight; the longest day is July 1 with 18:09 hours of daylight.