Juneau is on Alaska Time, nine hours earlier than Greenwich Mean Time during standard time, or eight hours during daylight savings time. Daylight savings time begins on the second Sunday of March, and ends on the first Sunday of November.epending on the location in the city and borough, average annual rainfall ranges from 55 inches to over 90 inches, and the average annual snowfall at Juneau International Airport is 93 inches. June and July are the driest months, with an average of 16 days of rain.