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Alaska Weather Summary -- September 2013

Alaska Climate Research Center,Uaf

Anchorage recorded a mean temperature for September of 48 degrees Fahrenheit, which is 0.6 degrees below the expected temperature. The highest temperature, 62 degrees, was measured on September 3. The month’s lowest temperature, 27 degrees, occurred on the 24th. For most days of September, temperatures were near or slightly above normal.

Precipitation was measured at 5.85 inches, 196 percent of the normal of 2.99 inches. The mean monthly wind speed was 5.8 mph. September’s greatest wind gust was 45 mph and occurred September 3, blowing from a southeasterly direction.

Barrow observed a mean temperature of 31.2 degrees Fahrenheit for September, 0.9 degrees below normal. A warm 51 degrees was the highest temperature recorded for the month and occurred September 6. Meanwhile, on the 24th, the coolest temperature for the month, 6 degrees, occurred. Temperatures tended to stay within the normal amounts for the month, aside from a two-day warm spell starting on the 6th and a four-day cold spell starting on the 23rd.

Precipitation was 1.37 inches, 190 percent above normal. A large amount of this participation fell as snow (8.1 inches), 5.2 inches more than normal. The mean monthly wind speed was recorded as 12.4 mph. The month’s highest wind gust, 46 mph, was measured on the 3rd and blew from a northeasterly direction.

Delta Junction's mean temperature for September was 42.6 degrees Fahrenheit, 1.4 degrees below normal. A warm 68 degrees was the month’s high temperature and occurred September 3. A chilly 17 degrees was the coldest temperature, recorded on the 21st.

Precipitation in Delta Junction was 0.85 inches, 83 percent of the normal amount of 1.03 inches.

Fairbanks was 1.1 degrees below its long-term mean, with a monthly mean temperature of 43.8 degrees Fahrenheit for September. The warmest temperature for the month, 71 degrees, occurred the 10th. Three days later, a cold spell occurred lasting nine days. On the 23rd, a temperature of 23 degrees was recorded, which was the coldest temperature of the month.

Precipitation in Fairbanks was 1.74 inches, 158 percent of the normal amount of 1.1 inches. On the 11th, 0.75 inches of rain fell, breaking the previous record for that day set in 1991. The first snowfall of the season was observed on September 18, with 0.6 inches. This event constituted the majority of snowfall for the month. The mean wind speed was a low 4.1 mph, while the highest wind gust, 33mph, blew from a southwesterly direction on the 3rd.

Juneau had a mean temperature of 51.9 degrees Fahrenheit in September, which was 1.9 degrees above normal. The warmest temperature of the month, 69 degrees, was recorded on the 2nd. The coldest temperature occurred September 25. It was a chilly 32 degrees.

Precipitation for Juneau was 7.53 inches or 87 percent of the normal amount. The monthly mean wind speed was calculated as 8.3 mph, with a maximum gust of 40 mph on the 7th. That large gust blew from an easterly direction.

Ketchikan was 3.1 degrees warmer in September than the expected temperature of 52.5 degrees Fahrenheit. The month’s highest temperature, 73 degrees, was recorded on both the 3rd and the 7th. The month’s lowest temperature, 42 degrees, occurred on the 24th and 25th.

Ketchikan’s precipitation was measured as 16.48 inches, 2.69 inches above the normal amount. A new daily record was set on the 19th, with an amazing 5.13 inches of precipitation. This broke the old record set for the day in 1950.

The mean monthly temperature for September in King Salmon was 47 degrees Fahrenheit, 0.6 degrees below normal.  On the 1st, 70 degrees was recorded, which was the highest temperature for the month. On the 24th, a temperature of 24 degrees occurred, which was the low temperature of the month. While most of September was close to normal or slightly above it, there was a substantial cold spell from the 17th to 24th.

Precipitation was 2.08 inches, about two-thirds of the expected amount. The mean monthly wind speed was calculated as 10.7 mph, with a high wind gust of 45mph, occurring on the 2nd. That large gust blew from a southeasterly direction.

Kodiak's mean monthly temperature was just 0.7 degrees above the normal of 50.1 degrees Fahrenheit for September. The highest temperature of the month, 67 degrees, occurred on the 1st. The month’s coldest temperature, 31 degrees Fahrenheit, occurred on the 24th.

Precipitation was also near normal in Kodiak; it was just 3 percent above the normal amount with 7.54 inches measured. The mean monthly wind speed was calculated as 11.9 mph. The highest gust of September, 67 mph, occurred on the 22nd and blew from a westerly direction.

Nome's mean temperature for September was 39.9 degrees Fahrenheit, 2.9 degrees below the normal amount of 42.8 degrees. The month’s highest temperature, 55 degrees, was observed on the 9th. The month’s coldest temperature, 21 degrees, occurred on the 30th.

Precipitation was 81 percent of normal with 1.98 inches recorded. The rainfall of the 12th, 0.7 inches, contributed more than one-third of the monthly amount and established a new record for the day. The first measurable snowfall, 0.7 inches, occurred September 23, bringing the monthly total to 1.1 inches. Mean monthly wind speed was calculated as 7.3 mph and the greatest gust was recorded on the 2nd. That gust was 35mph and blew from a northerly direction.
This information consists of preliminary climatological data compiled by the Alaska Climate Research Center, Geophysical Institute, University of Alaska Fairbanks. For more information on weather and climatology, contact the center at 474-7885 or visit the center web site at Please report any errors to

Alaska Climate Research Center, UAF