Recent years have seen very warm late summer and early autumn ocean surface temperatures to the Bering Sea, and as a result land areas close by have also been warm. At Cold Bay, the three mildest Septembers have occurred since 2014. This year, the average September of 51.0°F (10.6°C) was second only to the 51.2°F (10.7°C) reported in 2016.
As the days get shorter rain regularly changes to snow in the northern Interior during the second half of September, even if it's just flurries. That was not the case this year at Bettles, where there was no snow at all; the first September to record zero snow since 1997.
The average temperature in September at Kodiak was 53.9°F (12.2°C), making this the warmest September since 1929, when the average temperature was 54.5°F (12.5°C). Climate observations have been made at Kodiak, although with a few breaks, since 1913.
The average temperature at Bethel in September was 51.1°F (10.6°C), making this the warmest September of record. The previous warmest September was is in 1926, when the average temperature was 50.7°F (10.4°C). Climate observations have been made at Bethel since the summer of 1923.
This was the warmest September of record at Kotzebue. The average temperature of 49.1°F (9.5°C) was nearly seven degrees above normal. The previous warmest September was in 1974, when the average temperature was 47.7°F (8.7°C)
The average temperature at the Anchorage Airport in September was 55.0F (12.8C). This is more than six degrees above normal and is easily the warmest September of record. The previous warmest September was in 1995, when the average temperature was 53.6 (12.0C). The low temperature for the month was only 40F (4C), the first time the temperature has failed to get into the 30s at any point in September.
Juneau Airport received only 2.28" (58mm) of rain in September. This is only 26 percent of normal and is the driest September of record. The previous driest was in 1965, when rainfall totaled just 2.34" (59mm) of rain. Climate observations have been made at the Juneau Airport since the early 1940s.
Sitka recorded just 3.55" (90mm) of rain in September. This is only 30% of normal and makes this the driest September of record at the Airport. The previous record low September rainfall was 3.94" (100mm) in 1986. Observations have been made at the Sitka Airport since the mid-1940s.
Following the second wettest August of record at Gulkana, September turned the tables, with 0.10" (2.5mm) precipitation during the month is the second lowest of record. The only drier September since 1943 was in 1969, when there was just 0.07" (1.8mm) precipitation.
The first week of August brought unusually warm weather to far southwest Alaska. Dutch Harbor reported a high of 79° (26°C) on August 6, and Cold Bay a record tying 73° (23°C) on August 5. Other unusual high temperatures in the Aleutians and Alaska Peninsula during this period included 76° (24°C) at Chignik, 69° (21°C) at Sand Point and 67° (19°C) at Adak.
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