


Climatological Report (Daily)
Issued by NWS
Issued by NWS
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817 CDUS43 KLOT 040643 CLIORD CLIMATE REPORT NATIONAL WEATHER SERVICE CHICAGO IL 143 AM CDT SAT OCT 04 2025 ................................... ...THE CHICAGO-OHARE CLIMATE SUMMARY FOR OCTOBER 3 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 89 1:31 PM 91 1954 69 20 80 MINIMUM 64 6:22 AM 29 1974 50 14 54 1981 AVERAGE 77 59 18 67 PRECIPITATION (IN) YESTERDAY 0.00 3.95 1954 0.11 -0.11 0.00 MONTH TO DATE 0.00 0.34 -0.34 0.00 SINCE SEP 1 0.49 3.53 -3.04 1.32 SINCE JAN 1 22.94 30.24 -7.30 28.18 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 SEP 1 0.0 0.0 0.0 0.0 SINCE JUL 1 0.0 0.0 0.0 0.0 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 0 7 -7 0 MONTH TO DATE 0 20 -20 7 SINCE SEP 1 32 97 -65 22 SINCE JUL 1 37 103 -66 22 COOLING YESTERDAY 12 1 11 2 MONTH TO DATE 24 3 21 2 SINCE SEP 1 190 119 71 192 SINCE JAN 1 1182 991 191 1178 ................................................................... WIND (MPH) HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION SW (220) HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SW (220) AVERAGE WIND SPEED 5.1 SKY COVER AVERAGE SKY COVER 0.2 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. NO SIGNIFICANT WEATHER WAS OBSERVED. RELATIVE HUMIDITY (PERCENT) HIGHEST 73 6:00 AM LOWEST 33 2:00 PM AVERAGE 53 .......................................................... THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 68 90 1951 MINIMUM TEMPERATURE (F) 50 32 1980 1989 SUNRISE AND SUNSET OCTOBER 4 2025.......SUNRISE 6:52 AM CDT SUNSET 6:28 PM CDT OCTOBER 5 2025.......SUNRISE 6:53 AM CDT SUNSET 6:26 PM CDT - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$