Cloud cover
The island's humidity level, which averages more than 80 percent year round, is highest during the summer. Cloud cover levels peak during the summer as well. Although high year-round, with an average of 88 percent, cloud cover levels rise to 95 percent in the summer. Fog too is more common in the summer, occurring on roughly one-third of the days. The island receives about of precipitation per year, with the highest monthly totals occurring between late summer and early winter, when Bering Sea storms batter the island. Snowfall levels are highest between December and March, averaging per year. Other than trace amounts, the period from June to September is generally snow-free. High winds and relatively warm temperatures combine to keep snow levels low, resulting in monthly mean snow depths of less than . Hours of daylight range from a low of 6.5 hours in midwinter to a high of 18 hours in midsummer.