Climatological Report (Monthly)
Issued by NWS
Issued by NWS
858
CXUS53 KLOT 011348
CLMMDW
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
848 AM CDT SAT NOV 01 2025
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...THE CHICAGO-MIDWAY CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 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
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TEMPERATURE (F)
RECORD
HIGH 94 10/06/1963
LOW 20 10/24/1981
10/18/1948
10/20/1930
HIGHEST 90 10/03 86 10/05
LOWEST 35 10/24 38 10/16
10/17
AVG. MAXIMUM 66.6 63.4 3.2 70.6
AVG. MINIMUM 51.8 46.5 5.3 50.4
MEAN 59.2 54.9 4.3 60.5
DAYS MAX >= 90 1 0.0 1.0 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.9 -0.9 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 12.06 1954
MINIMUM 0.20 1964
TOTALS 2.78 3.48 -0.70 1.22
DAILY AVG. 0.09 0.11 -0.02 0.04
DAYS >= .01 7 11.5 -4.5 6
DAYS >= .10 5 6.3 -1.3 2
DAYS >= .50 3 2.2 0.8 1
DAYS >= 1.00 1 1.0 0.0 0
GREATEST
24 HR. TOTAL 1.41 10/06 TO 10/07 0.70
DEGREE DAYS
HEATING TOTAL 237 332 -95 172
SINCE 7/1 260 393 -133 MM
COOLING TOTAL 65 20 45 40
SINCE 1/1 1410 1112 298 MM
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WIND (MPH)
AVERAGE WIND SPEED 9.5
HIGHEST WIND SPEED/DIRECTION 31/260 DATE 10/21
HIGHEST GUST SPEED/DIRECTION 44/260 DATE 10/21
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.53
NUMBER OF DAYS FAIR 9
NUMBER OF DAYS PC 16
NUMBER OF DAYS CLOUDY 6
AVERAGE RH (PERCENT) 62
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 3 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 2
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 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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