930
CXUS53 KLOT 011258
CLMMDW

CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
758 AM CDT WED OCT 01 2025

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

...THE CHICAGO-MIDWAY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1928 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH            102   09/15/1939
 LOW              29   09/28/1942
HIGHEST           90   09/19                          93  09/21
                       09/29
LOWEST            49   09/07                          49  09/08
AVG. MAXIMUM    79.9               76.3     3.6     80.7
AVG. MINIMUM    61.8               58.8     3.0     62.7
MEAN            70.8               67.5     3.3     71.7
DAYS MAX >= 90     2                2.2    -0.2        4
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       14.17   1961
 MINIMUM        0.01   1979
TOTALS          0.56               2.77   -2.21     1.89
DAILY AVG.      0.02               0.09   -0.07     0.06
DAYS >= .01        5                8.9    -3.9        5
DAYS >= .10        3                5.4    -2.4        3
DAYS >= .50        0                1.7    -1.7        2
DAYS >= 1.00       0                0.5    -0.5        0
GREATEST
 24 HR. TOTAL   0.20   09/13 TO 09/13               0.96

DEGREE DAYS
HEATING TOTAL     21                 59     -38       10
 SINCE 7/1        23                 63     -40       MM
COOLING TOTAL    204                136      68      219
 SINCE 1/1      1345               1092     253       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.2
HIGHEST WIND SPEED/DIRECTION    26/350    DATE  09/13
HIGHEST GUST SPEED/DIRECTION    35/350    DATE  09/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.42
NUMBER OF DAYS FAIR           15
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                4     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       4     FOG W/VIS <= 1/4 MILE      0
HAZE                      4

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

$$