053 CDUS43 KLOT 170635 CLIORD CLIMATE REPORT NATIONAL WEATHER SERVICE CHICAGO IL 1235 AM CST WED DEC 17 2025 ................................... ...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 16 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 40 3:19 PM 66 2021 36 4 51 MINIMUM 17 6:23 AM -12 1951 24 -7 37 AVERAGE 29 30 -1 44 PRECIPITATION (IN) YESTERDAY 0.00 1.67 1921 0.06 -0.06 0.03 MONTH TO DATE 0.72 1.15 -0.43 0.41 SINCE DEC 1 0.72 1.15 -0.43 0.41 SINCE JAN 1 28.44 36.90 -8.46 33.40 SNOWFALL (IN) YESTERDAY 0.0 4.8 2008 0.3 -0.3 0.0 MONTH TO DATE 6.9 3.6 3.3 0.2 SINCE DEC 1 6.9 3.6 3.3 0.2 SINCE JUL 1 17.3 5.6 11.7 3.1 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 36 35 1 21 MONTH TO DATE 690 520 170 567 SINCE DEC 1 690 520 170 567 SINCE JUL 1 1659 1671 -12 1334 COOLING YESTERDAY 0 0 0 0 MONTH TO DATE 0 0 0 0 SINCE DEC 1 0 0 0 0 SINCE JAN 1 1215 1003 212 1212 ................................................................... WIND (MPH) HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SW (230) HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION SW (240) AVERAGE WIND SPEED 10.7 SKY COVER AVERAGE SKY COVER 0.4 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. NO SIGNIFICANT WEATHER WAS OBSERVED. RELATIVE HUMIDITY (PERCENT) HIGHEST 77 5:00 AM LOWEST 57 3:00 PM AVERAGE 67 .......................................................... THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 36 60 1977 MINIMUM TEMPERATURE (F) 24 -7 1951 SUNRISE AND SUNSET DECEMBER 17 2025......SUNRISE 7:14 AM CST SUNSET 4:22 PM CST DECEMBER 18 2025......SUNRISE 7:15 AM CST SUNSET 4:22 PM CST - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$