Climatological Report (Annual) Issued by NWS
216
CXUS53 KLOT 021750
CLAORD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1150 AM CST SAT JAN 02 2021
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...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE YEAR OF 2020...
CLIMATE NORMAL PERIOD: 1981 TO 2010
CLIMATE RECORD PERIOD: 1871 TO 2021
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 105 07/24/1934
LOW -27 01/20/1985
HIGHEST 97 08/24 MM MM 95 07/20
LOWEST -2 02/14 MM MM -23 01/30
AVG. MAXIMUM 61.7 59.1 2.6 57.8
AVG. MINIMUM 44.9 40.8 4.1 41.4
MEAN 53.3 49.9 3.4 49.6
DAYS MAX >= 90 31 14.0 17.0 14
DAYS MAX <= 32 19 42.7 -23.7 50
DAYS MIN <= 32 103 121.8 -18.8 131
DAYS MIN <= 0 1 7.1 -6.1 7
PRECIPITATION (INCHES)
RECORD
MAXIMUM 50.86 2008
MINIMUM 22.22 1962
TOTALS 39.22 36.89 2.33 49.54
DAILY AVG. 0.11 0.10 0.01 0.14
DAYS >= .01 118 124.1 -6.1 151
DAYS >= .10 77 69.1 7.9 93
DAYS >= .50 22 22.7 -0.7 32
DAYS >= 1.00 7 8.3 -1.3 10
GREATEST
24 HR. TOTAL 3.53 05/14 TO 05/14 2.28
SNOWFALL (INCHES)
RECORDS
TOTAL 95.3 1978
24 HR TOTAL MM
SNOW DEPTH 29 01/14/1979
TOTALS 28.0 36.3 -8.3 45.7
SINCE 7/1 3.5 9.6 -6.1 10.3
SNOW DEPTH AVG. 0 MM MM 0
DAYS >= TRACE 56 MM MM 65
DAYS >= 1.0 13 11.4 1.6 14
GREATEST
SNOW DEPTH 3 03/23 10
02/15
02/14
02/13
24 HR TOTAL 3.1 01/17 TO 01/17 5.4
DEGREE DAYS
HEATING TOTAL 5472 6339 -867 6429
SINCE 7/1 1989 2409 -420 MM
COOLING TOTAL 1295 842 453 960
SINCE 1/1 1295 843 452 960
FREEZE DATES
RECORD
EARLIEST 09/22/1995
LATEST 05/25/1992
EARLIEST 10/28
LATEST 05/09
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WIND (MPH)
AVERAGE WIND SPEED 9.6
HIGHEST WIND SPEED/DIRECTION 40/270 DATE 08/10
40/060 07/07
40/330 06/26
HIGHEST GUST SPEED/DIRECTION 62/270 DATE 08/10
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.61
NUMBER OF DAYS FAIR 73
NUMBER OF DAYS PC 149
NUMBER OF DAYS CLOUDY 144
AVERAGE RH (PERCENT) 64
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 44 MIXED PRECIP 0
HEAVY RAIN 36 RAIN 54
LIGHT RAIN 137 FREEZING RAIN 1
LT FREEZING RAIN 7 HAIL 3
HEAVY SNOW 2 SNOW 13
LIGHT SNOW 54 SLEET 1
FOG 124 FOG W/VIS <= 1/4 MILE 8
HAZE 65
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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