Climatological Report (Annual)
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000
CXUS53 KLOT 021750
CLAORD

CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1150 AM CST SAT JAN 02 2021

...................................

...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
................................................................
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
................................................................

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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