Why does Kivalina have so much precipitation in summer?

Why does Chivalina have a lot of precipitation in summer?

Because the town of Chivalina is located in the mid-latitudes, and the westerly wind belt in the mid-latitudes is very deep. In the mid-latitudes, cold air from high latitudes and warm air from low latitudes converge to form unstable weather in the westerly belt, especially in the ocean where there are often stormy weather.