Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS43 KLOT 182138
CLIMDW
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
438 PM CDT MON AUG 18 2025
...................................
...THE CHICAGO-MIDWAY CLIMATE SUMMARY FOR AUGUST 18 2025...
VALID TODAY AS OF 0400 PM LOCAL TIME.
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1928 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
TODAY
MAXIMUM 88 2:28 PM 99 1936 83 5 79
MINIMUM 73 MM 49 1963 66 7 68
AVERAGE 81 74 7 74
PRECIPITATION (IN)
TODAY T 1.80 1954 0.14 -0.14 0.01
MONTH TO DATE 1.44 2.34 -0.90 2.86
SINCE JUN 1 13.47 9.90 3.57 12.61
SINCE JAN 1 23.04 22.38 0.66 28.59
DEGREE DAYS
HEATING
TODAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE JUN 1 9 25 -16 3
SINCE JUL 1 0 1 -1 0
COOLING
TODAY 16 10 6 9
MONTH TO DATE 256 187 69 189
SINCE JUN 1 1024 762 262 863
SINCE JAN 1 1075 844 231 976
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (170)
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION S (170)
AVERAGE WIND SPEED 9.1
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 85 3:00 AM
LOWEST 65 1:00 PM
AVERAGE 75
..........................................................
THE CHICAGO-MIDWAY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 99 1947
1983
MINIMUM TEMPERATURE (F) 66 49 1933
SUNRISE AND SUNSET
AUGUST 18 2025........SUNRISE 6:03 AM CDT SUNSET 7:46 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.
$$