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Public Information Statement - River Forecast Center 


NOAK48 PAFC 111822

Public Information Statement
National Weather Service Anchorage AK
1022 AM AKDT Mon Oct 11 2021

...Anchorage International Airport Climate Highlights for
September 2021...

...23rd Coolest September...
...25th Driest September...
...Coolest September since 2015...

The period of record includes 70 Septembers.


September 2021 was the 23rd coolest September on record with an
average temperature of 47.5 degrees. This is 1.8 degrees below
the normal of 49.3 degrees.

The average high in September was 53.7 degrees, which was 2.0
degrees below the normal of 55.7 degrees. The average low was
41.3 degrees, which was 1.6 degrees below the normal of 42.9

September 2021 was the coolest September since 2015.

14 days in September had below normal temperatures.
11 days in September had above normal temperatures.
5 days in September had normal temperatures (within 1/2 degree).

0 days in September were more than 5 degrees above the daily
9 days in September were more than 5 degrees below the daily
1 day in September was more than 10 degrees below the daily

The most above normal day in September occurred on the 5th, which
was 4.8 degrees warmer than the daily normal.

The most below normal day in September occurred on the 22nd,
which was 11.2 degrees cooler than the daily normal.

The warmest daily high in September occurred on the 3rd and the
5th, when the high reached 62 degrees. This ties several other
years for the 11th coolest monthly high in September. This was
the coolest September monthly high since 2020. The normal monthly
high in September is 65 degrees.

The coolest daily low in September occurred on the 28th and the
30th, when the low dropped to 25 degrees. This ties numerous
years for the 3rd coolest monthly low in September. This was the
coolest September monthly low since 2010. The normal monthly low
in September is 30 degrees.

Top 5 coolest monthly lows in September
1) 19 degrees- 1992.
2) 20 degrees- 1956.
3-5) 25 degrees- 2021, 2010, 1996, 1986, 1983, 1974, 1953.

September had 8 days with highs of 60 or more. Average: 7 days.
September had 20 days with highs of 50 or more. Average: 26 days.
September had all 30 days with highs of 40 or more. Average: 30 days.

September had 5 days with lows in the 20s and colder. Average: 1 day.
September had 12 days with lows in the 30s and colder. Average: 10 days.
September had 23 days with lows in the 40s and colder. Average: 27 days.

The last time September had more than 5 days with lows in the 20s was in

Top 5 Septembers with the most lows in the 20s
1) 12 days- 1992.
2) 6 days- 1956.
3) 5 days- 2021.
5 days- 1955.
5) 4 days- 1983, 1981, 1972, 1970.


September 2021 was the 25th driest September on record, with 1.95
inches of precipitation measured for the month. The normal
precipitation in September is 3.10 inches. Thus, September had
63% of its normal precipitation.

The wettest day in September was on the 23rd, with 0.57 inches of
precipitation measured.

19 of 30 days in September had a trace or more of precipitation.
18 days had measurable precipitation.
5 days had 1/10 inch or more of precipitation.
3 days had 1/4 inch or more of precipitation.
1 day had 1/2 inch or more of precipitation.


A trace of snowfall was observed in September 2021. The normal
snowfall for September is 0.4 inches. Only 24 of 70 Septembers on
record have recorded a trace or more of snowfall, of which only 10
Septembers have recorded measurable snow.

September 2019 was the last September to record a trace of snow.
September 2015 was the last September to record measurable snow.

...Snow Season...

A trace of snow has been recorded this snow season. Anchorage is
0.4 inches below normal for total snow season snow through the end
of September.

...September 2021 vs. September 2020...

September 2021 was cooler but with similar precipitation as September 2020.

Temperature: 47.5 degrees in 2021 vs. 50.6 degrees in 2020.
Precipitation: 1.95 inches in 2021 vs. 1.88 inches in 2020.
Snowfall: Trace in 2021 vs. 0 inches in 2020.
Snow Season: Trace in 2021-2022 vs. 0 inches in 2020-2021.

...Daily Records Set in September 2021...

Type............Date...New Record....Old Record (Year)

Low Minimum.....30th...25 degrees....25 degrees (1953)

Precipitation...23rd...0.57 inches...0.53 inches (1974)

...Daily Records Count for 2021 (Change) [Most Recent Previous]...

High Maximum....5 (00) [July 18, 2021]
High Minimum....3 (00) [August 3, 2021]
Low Maximum.....4 (00) [July 3, 2021]
Low Minimum.....5 (+1) [September 30, 2021]
Precipitation...7 (+1) [September 23, 2021]
Snowfall........0 (00) [December 19, 2020]
Snow Depth......10 (00) [April 16, 2021]

...Climate Highlights for October 2021...

Normal High: 42.0 degrees.
Normal Temperature: 36.3 degrees.
Normal Low: 30.7 degrees.
Normal Precipitation: 1.82 inches.
Normal Snowfall: 5.6 inches.

Warmest October: 44.8 degrees average temperature (2018).
Warmest Day: 64 degrees on October 9, 2006.
Coolest October: 25.4 degrees average temperature (1996).
Coolest Day: 5 below degrees on October 31, 1956.
Wettest October: 4.11 inches (1986).
Wettest Day: 1.68 inches on October 26, 1952.
Driest October: 0.35 inches (1960).

...Calendar of Astronomy and Federal Holidays...

Beginning of the Month Daylight: 11 hours 22 minutes.
11 hours of Daylight: October 5th.
New Moon: October 6th at 3:05am.
Last Sunset After 7pm: October 10th.
Columbus Day: October 11th.
First Quarter Moon: October 12th at 7:25pm.
Last Day with More than 10 hours of Daylight: October 15th.
Full (Hunter`s) Moon: October 20th at 6:56am.
Last Sunrise Before 9am: October 21st.
Last Day with More than 9 hours of Daylight: October 26th.
Third Quarter Moon: October 28th at 12:05pm.
Last Sunset After 6pm: October 30th.

End of the Month Daylight: 8 hours 33 minutes.
Total Monthly Daylight Loss: 2 hours 49 minutes.

Next Eclipse Viewable in Anchorage:
Partial Lunar Eclipse- November 18-19, 2021 at 12:02am Nov. 19th.