860
CXUS53 KLOT 011348
CLMORD

CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
848 AM CDT SAT NOV 01 2025

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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 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             94   10/06/1963
 LOW              14   10/25/1887
HIGHEST           89   10/03                          85  10/05
LOWEST            34   10/24                          37  10/16
                                                          10/27
AVG. MAXIMUM    66.1               62.7     3.4     70.1
AVG. MINIMUM    50.2               45.4     4.8     49.3
MEAN            58.1               54.0     4.1     59.7
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                2.7    -2.7        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       12.06   1954
 MINIMUM        0.18   1897
TOTALS          2.60               3.43   -0.83     1.18
DAILY AVG.      0.08               0.11   -0.03     0.04
DAYS >= .01        9               10.5    -1.5        7
DAYS >= .10        5                6.3    -1.3        3
DAYS >= .50        2                2.3    -0.3        1
DAYS >= 1.00       0                0.7    -0.7        0
GREATEST
 24 HR. TOTAL   1.35   10/06 TO 10/07               0.84

SNOWFALL (INCHES)
RECORDS
 TOTAL           6.3   1989
TOTALS           0.0                0.2    -0.2      0.0
SINCE 7/1        0.0                0.2    -0.2       MM
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                   0  MM
 24 HR TOTAL     0.0                                 0.0

DEGREE DAYS
HEATING TOTAL    259                355     -96      194
 SINCE 7/1       296                440    -144       MM
COOLING TOTAL     57                 15      42       35
 SINCE 1/1      1215               1003     212       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.0
HIGHEST WIND SPEED/DIRECTION    26/040    DATE  10/29
HIGHEST GUST SPEED/DIRECTION    41/270    DATE  10/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.52
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       5
LIGHT RAIN                8     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

$$