981
CXUS53 KLOT 011008
CLMDPA

CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
508 AM CDT THU OCT 01 2026

...................................

...THE DUPAGE AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1997 TO 2026

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             95   09/02/2008
 LOW              32   09/24/2012
HIGHEST           94   09/02                          90  09/29
LOWEST            44   09/28                          42  09/07
AVG. MAXIMUM    77.0               75.5     1.5     80.1
AVG. MINIMUM    59.0               53.7     5.3     54.8
MEAN            68.0               64.6     3.4     67.4
DAYS MAX >= 90     4                1.7     2.3        1
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       12.26   2008
 MINIMUM        0.30   2017
TOTALS          4.74               3.00    1.74     0.64
DAILY AVG.      0.16               0.10    0.06     0.02
DAYS >= .01        7               10.0    -3.0        6
DAYS >= .10        5                5.2    -0.2        2
DAYS >= .50        4                1.8     2.2        0
DAYS >= 1.00       3                0.7     2.3        0
GREATEST
 24 HR. TOTAL   1.57   09/17 TO 09/17               0.31

DEGREE DAYS
HEATING TOTAL     53                100     -47       47
 SINCE 7/1        54                111     -57       MM
COOLING TOTAL    149                 88      61      127
 SINCE 1/1       830                812      18       MM
................................................................

AVERAGE RH (PERCENT)     75

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       4
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      3
HAZE                      0

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

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