Public Information Statement
Issued by NWS La Crosse, WI

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Public Information Statement
National Weather Service La Crosse WI
1031 AM CDT Sun Oct 1 2023

...September 2023 was Slightly Drier and Unusually Warm (3rd warmest
- warmest since 1931) at Rochester, MN...

...September 2023 Highlights...

Temperatures - 3rd Warmest - Warmest since 1931

During September, the average temperature at Rochester International
Airport was 66.2°F. This was 5.1°F warmer than the 1991-2020 normal
of 61.1°F. This was tied with 2015 for the 3rd warmest September and
the warmest since 1931 (66.9°F - 2nd warmest). The warmest September
occurred in 1908 when the average temperature was 69.6°F. 10 out of
the 20 warmest Septembers have occurred since 2004. The table below
contains the 20 warmest Septembers in Rochester, MN.

   Warmest Septembers
    in Rochester MN
       1886-2023

Rank   Avg. Temp   Year
----   ---------   ----
  1     69.6°F     1908
  2     66.9°F     1931
  3     66.3°F     2023
  4     66.2°F     2015
  5     65.3°F     1948
  6     65.2°F     1933
  7     65.1°F     2019
  8     64.7°F     2005
  9     64.4°F     2016
        64.4°F     2004
        64.4°F     1998
 12     64.1°F     2017
 13     64.0°F     2013
        64.0°F     1939
        64.0°F     1919
 16     63.9°F     2007
 17     63.7°F     1978
 18     63.6°F     1936
 19     63.2°F     1994
 20     63.1°F     2021

The average high temperature was 77.2°F. This was 5.4°F warmer than
the 1991-2020 of 71.8°F. This was the 6th warmest in September. The
warmest average high temperature in September was 81.9°F in 1908.

The average low temperature was 55.4°F. This was 5°F warmer than the
1991-2020 of 50.4°F. This was the 5th warmest in September. The
warmest average low temperature in September was 57.3°F in 1908.

The hottest temperature was 94°F on September 2 and September 3.
These were the warmest September temperatures since September 7,
1978.
The coldest high temperature was 62°F on September 7.

The warmest low temperature was 69°F on September 5.
The coldest low temperature was 41°F on September 13.

There were 4 days with high temperatures of 90°F or warmer. The long-
term average is 1-day.

Rainfall - Slightly Below Normal

A total of 3.43 inches of rain fell at Rochester International
Airport. This was 0.17 inches drier than the 1991-2020 normal of
3.60 inches. 5 out of the last 6 months (going back to April) have
been drier than normal. 15.98 inches of precipitation has fallen
during this growing season (starting on April 1). This was 9.15
inches drier than the 1991-2020 normal of 25.13 inches. This lack of
rainfall resulted in the rapid development of drought. The U.S.
Drought Monitor began the month of September with exceptional (D3)
drought in Olmsted County. By the end of September, the county had
improved from severe (D2) to exceptional (D3) drought.

Measurable rain fell on 10 days (33.3%) and trace amounts of rain
fell on another 4 days (13.3%).

The wettest calendar day was on September 23 when 1.82 inches of
rain fell. This was the wettest September day since September 12,
2019 (2.70 inches) and the wettest calendar day March 31, 2023 (2.15
inches).

...Records...

Daily Records...

September 2 - Record High - 94°F - Tied with 1929

September 3 - Record High - 94°F - Tied with 1937

September 30 - Record High - 90°F - Previous Record 89°F in 2019

September 30 -  Record Warm Low - 67°F - Previous Record 63°F
in 1950

September 30 - Warmest Daily Avg. Temperature - 78.5°F -
Previous Record 74.5°F in 2019

...Looking Ahead to October...

The normal high temperature in Rochester starts off at 66°F on
October 1st and falls to 50°F by the end of the month. The normal
low temperature starts off at 44°F on the 1st and falls to 32°F by
the end of the month. The warmest October temperature on record is
93°F on October 3, 1997, and the coldest is -6°F on October 25,
1887.

The normal mean temperature for October is 47.9°F. Rochester’s
warmest October occurred in 1963 with an average temperature of
58.1°F, and its coldest October occurred in 1917 with an average
temperature of 37.6°F.

The normal October precipitation is 2.43 inches. The wettest October
occurred in 1911 with 9.11 inches of precipitation and the driest
October occurred in 1952 with only 0.01 inches of precipitation. The
wettest October day occurred on October 6, 1911, when 2.85 inches of
precipitation fell. Normally, there are 2 days with thunderstorms.

The normal October snowfall is 0.9 inches. The snowiest October
occurred in 2009 with 7.9 inches of snow. The snowiest October day
occurred on October 22, 1979, when 5 inches of snow fell.

$$

Boyne


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