City Summary Archive

Fairbanks September 2011

In Fairbanks the average temperature was 48.9°F, a substantial 4.0°F above the long term mean for September. The high temperature for the month was 72°F on the 5th and 13th, while the lowest temperature of 28°F was observed on the 30th of the month. The 26th was the first day of the month where the temperature dropped below the freezing point, ending the growing season. Even though this is not a new record, it continues the trend of later frosts in fall. The mean annual temperature of Fairbanks has increased 2.5°F over the last century, a substantial value and about twice the global mean increase, however, even more impressive is the change in the duration of the frost-free season which increased by 45% over the same time frame. Precipitation in September was 0.65", 41% below the expected value. The combination of warm temperatures and below normal precipitation made for a pleasurable month. Wind speed averaged 3.6 mph and the highest gust was 26 mph on the 19th. No new temperature or precipitation records were observed.

Anchorage September 2011

Anchorage recorded an average temperature of 48.8°F, just slightly (0.2°F) above normal. The maximum temperature of the month occurred on the 13th September with 65°F, while a minimum temperature of 32°F was observed on three consecutive days: the 26th, 27th and 28th. No new records were set, and the observed daily temperature ranges followed fairly closely the expected values. Precipitation was reported at 0.78", which represents only 26% of the normal value. Nevertheless, mean monthly cloudiness was high (78%) and during the whole month not a single clear day was observed. An average monthly wind speed of 5.2 mph and a gust of 47 mph on the 13th were recorded.

Barrow September 2011

Barrow reported an average temperature in September of 36.7°F, 4.6°F above normal, the highest positive deviation of the 8 city summary, continuing the trend of last month. The maximum temperature occurred on the 11th at 51°F, and the lowest temperature of 20°F was observed on the last day of September. In general, the temperatures during most of the first &frac12 of the month were far above normal, while the second half were closer too normal. No new temperature records were observed during September. Precipitation in Barrow totaled 0.92", 28% above the normal value of 0.72" and 4.9" of snow fell, the greatest amount of 1.3" on the 27th September. 18 days of the month recorded trace or more amounts of snow. The mean monthly wind speed was 11.8 mph and gusts of 37 mph occurred on both the 17th and 18th.

Big Delta September 2011

Big Delta reported a mean temperature of 47.8°F, which is 3.9°F above the long-term mean temperature for September. The high temperature of the month was observed on the 13th at 71°F, surpassing the maximum temperature recorded for August 2011 by 1°F. Furthermore, it was a new maximum daily record for this date, surpassing the old value of 67°F, which occurred both in 1965 and 1956. The low temperatures for the month occurred on the 26th and 29th at 30°F for both days. The 26th was also the first day of frost which is quite late in the season. Precipitation totaled 0.27", 74% below the expected amount. No new precipitation record events were set.

Juneau September 2011

In Juneau, the average temperature was 48.8°F, somewhat (1.2°F) below normal for September. The maximum temperatures for the month (65°F) occurred on the 12th and the minimum temperature (33°F) occurred on the 25th September. No frost was observed during the month. Precipitation totaled 8.58", which is very close to the normal of 8.33". As might be deduced from the high precipitation amounts in the Southeast Alaska, sky cover was high, with no clear days, 8 partly cloudy days and 22 cloudy days. Average wind speed at Juneau Airport was 8.8 mph with the highest wind gust a substantial 71 mph on the 21st September.

Ketchikan September 2011

Ketchikan's average temperature of 53.8°F in September was 1.3°F above the long-term mean. The highest temperature of the month measured 70°F on the 12th, while the low temperature of 40°F occurred on the 25th of the month. Even though the mean monthly temperature was somewhat above the expected value, the daily temperature ranges followed fairly closely the long-term means. No new temperature extremes were recorded. Monthly precipitation was heavy and totaled 28.33", slightly more than twice the expected amount of 13.79". Precipitation occurred on 28 days of the month. Of note was the 20th of the month, with a daily total of 5.00". Despite the heavy rainfall, no new precipitation records were set during the month.

King Salmon September 2011

King Salmon reported an average temperature of 47.8°F, very close to the long- term mean of 47.6. The high temperature for September was 63°F, recorded on the 6th and 9th of the month. The low temperature of 25°F occurred on the 28th. Two days earlier, on the 26th September, the first frost occurred with a temperature below freezing (27°F), ending the growing season. The precipitation total was measured at 2.25", 29% below the normal of 3.19". Despite the lower than normal precipitation totals, on all days of the month, except three, some rain, if even just a trace, was recorded. Average wind speed was 7.1 mph and the highest gust was recorded at 49 mph on the 12th.

Kodiak September 2011

For Kodiak, the average monthly temperature of 49.2°F was close to the long-term mean of 49.6°F. The highest temperature of the month was 60°F on the 3rd, and the lowest was 32°F on the 29th. This was the first and only frost of the month. No temperature records were set in September. In general, the daily temperature ranges were very narrow for the first half of the month, and larger than expected for the second half. Mean wind speed was 8.3 mph, and the highest gust was 53 mph on the 5th. Monthly precipitation was heavy and totaled 15.49", more than twice the expected amount of 7.07". Precipitation, if even a trace amount, occurred on 28 days of the month. Three new daily precipitation records were set in September. The first one was set on the 2nd with 2.21", breaking the old record of 1.47" that had been in place since 1943. Then on the 5th, 1.59" of rain narrowly broke the 1982 record of 1.54". Finally, 12th saw a heavy 3.46" or rain, shattering the old total of 1.70" from 1979. This last record resulted in mudslide on the Chiniak Highway near Kodiak.

Nome September 2011

Nome reported a mean monthly temperature in September of 45.1°F, a positive deviation of 2.3°F from the long term mean. The warmest monthly temperature was 62°F observed on the 16th of September, while the coldest temperature occurred on the two last days of the month with each recording a minimum of 27°F. No new temperature extremes were observed during September. Precipitation was light, totaling 0.90", representing only 37% of the expected amount. 88% of that total occurred on just 3 days: 9th, 10th, and 24th. The average wind speed for the month was 9.1 mph, and the highest gust observed was 48 mph on the 6th.

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