933
CXUS53 KLOT 011258
CLMORD

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

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

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

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH            101   09/02/1953
                       09/01/1953
 LOW              29   09/23/1995
                       09/30/1984
                       09/28/1942
HIGHEST           89   09/19                          92  09/21
                       09/29
LOWEST            47   09/07                          48  09/07
AVG. MAXIMUM    78.9               75.5     3.4     80.3
AVG. MINIMUM    59.7               57.1     2.6     60.9
MEAN            69.3               66.3     3.0     70.6
DAYS MAX >= 90     0                2.0    -2.0        4
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.1    -0.1        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       14.17   1961
 MINIMUM        0.01   1979
TOTALS          0.49               3.19   -2.70     1.32
DAILY AVG.      0.02               0.11   -0.09     0.04
DAYS >= .01        5                8.5    -3.5        6
DAYS >= .10        2                5.6    -3.6        2
DAYS >= .50        0                1.9    -1.9        1
DAYS >= 1.00       0                0.8    -0.8        0
GREATEST
 24 HR. TOTAL   0.27   09/13 TO 09/13               0.80

DEGREE DAYS
HEATING TOTAL     32                 77     -45       15
 SINCE 7/1        37                 82     -45       MM
COOLING TOTAL    166                116      50      190
 SINCE 1/1      1158                988     170       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.8
HIGHEST WIND SPEED/DIRECTION    28/360    DATE  09/13
HIGHEST GUST SPEED/DIRECTION    40/350    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)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

$$