Climatological Report (Monthly)
Issued by NWS
Issued by NWS
779
CXUS53 KLOT 011449
CLMORD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
949 AM CDT MON SEP 01 2025
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...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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
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TEMPERATURE (F)
RECORD
HIGH 102 08/05/1918
LOW 42 08/28/1986
HIGHEST 95 08/09 99 08/27
08/16
LOWEST 54 08/26 55 08/22
08/31
AVG. MAXIMUM 81.6 82.5 -0.9 83.8
AVG. MINIMUM 65.0 65.1 -0.1 65.9
MEAN 73.3 73.8 -0.5 74.8
DAYS MAX >= 90 5 4.0 1.0 7
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 17.10 1987
MINIMUM 0.18 1893
TOTALS 5.03 4.25 0.78 2.60
DAILY AVG. 0.16 0.14 0.02 0.08
DAYS >= .01 8 9.4 -1.4 9
DAYS >= .10 7 6.5 0.5 8
DAYS >= .50 3 2.7 0.3 2
DAYS >= 1.00 2 1.2 0.8 0
GREATEST
24 HR. TOTAL 2.28 08/16 TO 08/17 0.82
DEGREE DAYS
HEATING TOTAL 5 4 1 0
SINCE 7/1 5 2 3 MM
COOLING TOTAL 269 277 -8 312
SINCE 1/1 992 872 120 MM
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WIND (MPH)
AVERAGE WIND SPEED 7.9
HIGHEST WIND SPEED/DIRECTION 36/330 DATE 08/17
HIGHEST GUST SPEED/DIRECTION 63/300 DATE 08/17
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.51
NUMBER OF DAYS FAIR 8
NUMBER OF DAYS PC 17
NUMBER OF DAYS CLOUDY 6
AVERAGE RH (PERCENT) 68
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 8 MIXED PRECIP 0
HEAVY RAIN 5 RAIN 6
LIGHT RAIN 9 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 10 FOG W/VIS <= 1/4 MILE 1
HAZE 9
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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