With an average temperature of 23.0°F (-5.0°C), this was the sixth mildest fall (September through November) of record at Utqiaġvik (Barrow). The typical autumn is now 10F (5.6C) warmer than in the 1970s, and seven of the ten warmest have occurred since 2005. The increase in temperature is strongly correlated with the decrease in autumn sea ice. Climate observations have been made without a break at Utqiaġvik since October 1920.
2018 brought Nome the warmest autumn in more than a century of climate observations. The average temperature for September through November was 36.9°F (2.7°C) which was 7.4°F (4.1°C) above normal. The previous warmest autumn was in 1926, when the average temperature was 36.3°F (2.4°C).
The average temperature at Cold Bay in November of 39.7°F (4.3°C) is the highest of record. The previous warmest Novembers were 2017 and 1985. Climate observations at Cold Bay began in 1950, with four of nine warmest Novembers having occurred since 2013.
This was the warmest autumn (September through November) of record in Bethel. The average temperature of 38.6°F (3.7°C) is 7.5°F (4.2°C) above normal and 2.2°F (1.2°C) warmer than the previous warmest autumn which occurred in 2002. Climate observations have been made in Bethel since the early 1920s.
2018 was the warmest autumn (September through November) of record in Anchorage. The average temperature for the autumn was 43.3°F (6.3°C). This is 8.1°F (4.5°C) above normal and easily exceeded the previous record warm autumn of 42.2°F (5.7°C) set in 1979. During the three months the daily average temperature was above normal on 84 of the 91 days.
The temperature dropped to freezing at Bethel for the first time in the autumn on October 19, the latest first freeze of record and ending the longest growing season of record. The 155 days between freezing temperatures easily exceed the previous record of 146 days set in 2007.
At Sitka, 27 of the 31 days in October were warmer than normal, and the month finished up with an average temperature of 50.6°F (10.3°C). This equals the average temperature of October 1986 as the warmest of record at Sitka. Climate observations have been made at Sitka since the mid-1940s.
Rains returned to the eastern Gulf of Alaska coast during October and consistently mild temperatures persisted. At Yakutat, the average October temperature for the month of 46.5°F (8.1°C) is the warmest of record, exceeding the previous record of 45.9°F (7.7°C) set in 1980. Climate observations have been made at Yakutat with only a few breaks since 1917.
Following the mildest September of record, Anchorage had the mildest October of record. The average temperature of 44.8°F (7.1°C) was 10°F (5.6°C) warmer than normal and easily exceeded the previous warmest October of 43.9°F (6.6°C) set in 2013. The first freeze of the season did not occur at the Anchorage Airport until October 28, more than a month later than average and 12 days later than the previous latest first freeze of October 16, 1969.
The average temperature for October at Utqiaġvik (Barrow) was 25.7°F (-3.5°C), making this the third warmest October of record. Five of the ten warmest Octobers in the past 99 years have occurred since 2012. Climate observations have been made at Utqiaġvik without a break since October 1920.
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