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Southeast Alaska is a mid-latitude oceanic climate (
Köppen climate classification: Cfb) in the southern sections and a subarctic oceanic climate (Köppen Cfc) in the northern parts. On an annual basis,
Southeast is both the wettest and warmest part of
Alaska with milder temperatures in the winter and high precipitation throughout the year.
Juneau averages over 50 in (130 cm) of precipitation a year, and
Ketchikan averages over
150 in (380 cm). This is also the only region in Alaska in which the average daytime high temperature is above freezing during the winter months.
The climate of
Anchorage and south central Alaska is mild by
Alaskan standards due to the region's proximity to the seacoast. While the area gets less rain than southeast Alaska, it gets more snow, and days tend to be clearer. On average, Anchorage receives 16 in (41 cm) of precipitation a year, with around 75 in (190 cm) of snow, although there are areas in the south central which receive far more snow. It is a subarctic climate (
Köppen: Dfc) due to its brief, cool summers.
The climate of
Western Alaska is determined in large part by the
Bering Sea and the
Gulf of Alaska. It is a subarctic oceanic climate in the southwest and a continental subarctic climate farther north. The temperature is somewhat moderate considering how far north the area is. This region has a tremendous amount of variety in precipitation. An area stretching from the northern side of the
Seward Peninsula to the
Kobuk River valley (i. e., the region around
Kotzebue Sound) is technically a desert, with portions receiving less than 10 in (25 cm) of precipitation annually. On the other extreme, some locations between
Dillingham and
Bethel average around
100 in (250 cm) of precipitation.
The climate of the interior of Alaska is subarctic. Some of the highest and lowest temperatures in Alaska occur around the area near
Fairbanks. The summers may have temperatures reaching into the 90s °F (the low-to-mid 30s °C), while in the winter, the temperature can fall below −60 °
F (−51 °C). Precipitation is sparse in the Interior, often less than 10 in (25 cm) a year, but what precipitation falls in the winter tends to stay the entire winter.
Source: wikipedia.org
http://en.wikipedia.org/wiki/Alaska