Climatological Report (Monthly) Issued by NWS
000
CXUS53 KLOT 011320
CLMORD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
820 AM CDT SUN OCT 01 2023
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...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2023
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 101 09/02/1953
09/01/1953
LOW 29 09/23/1995
09/30/1984
09/28/1942
HIGHEST 94 09/03 88 09/01
09/04
09/05
09/03
LOWEST 53 09/14 44 09/29
09/18
AVG. MAXIMUM 77.7 75.5 2.2 76.0
AVG. MINIMUM 61.2 57.1 4.1 58.8
MEAN 69.5 66.3 3.2 67.4
DAYS MAX >= 90 3 1.6 1.4 0
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 3.36 3.19 0.17 2.20
DAILY AVG. 0.11 0.11 0.00 0.07
DAYS >= .01 16 8.5 7.5 7
DAYS >= .10 5 5.6 -0.6 3
DAYS >= .50 2 1.9 0.1 1
DAYS >= 1.00 1 0.8 0.2 1
GREATEST
24 HR. TOTAL 1.62 09/16 TO 09/17 1.45
DEGREE DAYS
HEATING TOTAL 13 77 -64 75
SINCE 7/1 15 82 -67 MM
COOLING TOTAL 155 116 39 154
SINCE 1/1 1089 988 101 MM
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WIND (MPH)
AVERAGE WIND SPEED 7.5
HIGHEST WIND SPEED/DIRECTION 23/190 DATE 09/05
HIGHEST GUST SPEED/DIRECTION 32/190 DATE 09/05
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.62
NUMBER OF DAYS FAIR 7
NUMBER OF DAYS PC 10
NUMBER OF DAYS CLOUDY 13
AVERAGE RH (PERCENT) 69
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 4 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 3
LIGHT RAIN 15 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 13 FOG W/VIS <= 1/4 MILE 0
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
NO RECORDS SET OR TIED IN SEPTEMBER 2023.
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