Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS43 KLOT 180637
CLIORD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
137 AM CDT MON AUG 18 2025
...................................
...THE CHICAGO-OHARE CLIMATE SUMMARY FOR AUGUST 17 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 81 11:20 AM 98 1947 83 -2 84
1988
MINIMUM 69 2:11 AM 48 1976 65 4 69
AVERAGE 75 74 1 77
PRECIPITATION (IN)
YESTERDAY 1.69 2.60 1979 0.15 1.54 0.17
MONTH TO DATE 2.80 2.39 0.41 1.49
SINCE JUN 1 10.72 10.20 0.52 10.48
SINCE JAN 1 20.22 24.85 -4.63 25.75
SNOWFALL (IN)
YESTERDAY 0.0 0.0 MM 0.0 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE JUN 1 0.0 0.0 0.0 T
SINCE JUL 1 0.0 0.0 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE JUN 1 13 33 -20 6
SINCE JUL 1 0 2 -2 0
COOLING
YESTERDAY 10 9 1 12
MONTH TO DATE 210 165 45 164
SINCE JUN 1 899 690 209 758
SINCE JAN 1 933 760 173 838
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 36 HIGHEST WIND DIRECTION NW (330)
HIGHEST GUST SPEED 63 HIGHEST GUST DIRECTION NW (300)
AVERAGE WIND SPEED 8.3
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
HEAVY RAIN
RAIN
LIGHT RAIN
FOG
FOG W/VISIBILITY <= 1/4 MILE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 1:00 AM
LOWEST 71 5:00 PM
AVERAGE 84
..........................................................
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 98 1947
MINIMUM TEMPERATURE (F) 65 49 1963
SUNRISE AND SUNSET
AUGUST 18 2025........SUNRISE 6:03 AM CDT SUNSET 7:47 PM CDT
AUGUST 19 2025........SUNRISE 6:04 AM CDT SUNSET 7:45 PM CDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$