Climatological Report (Annual)
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CXUS53 KLOT 011741
CLAORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
849 AM CST TUE JAN 1 2019

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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE YEAR OF 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2018

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   08/04        MM      MM       95  09/23
                        05/27                             06/12
LOWEST             -9   01/02        MM      MM       -4  12/27
                        01/01
AVG. MAXIMUM     59.1              59.1     0.0     61.3
AVG. MINIMUM     42.8              40.8     2.0     43.8
MEAN             50.9              49.9     1.0     52.6
DAYS MAX >= 90     26              14.0    12.0       16
DAYS MAX <= 32     32              42.7   -10.7       30
DAYS MIN <= 32    134             121.8    12.2      102
DAYS MIN <= 0       6               7.1    -1.1        7

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        50.86   2008
 MINIMUM        22.22   1962
TOTALS          49.23             36.89   12.34    43.10
DAILY AVG.       0.14              0.10    0.04     0.12
DAYS >= .01       147             124.1    22.9      122
DAYS >= .10        87              69.1    17.9       74
DAYS >= .50        33              22.7    10.3       27
DAYS >= 1.00       15               8.3     6.7        9
GREATEST
 24 HR. TOTAL    2.49   MM                          4.19

SNOWFALL (INCHES)
RECORDS
 TOTAL           95.3   1978
 24 HR TOTAL       MM
 SNOW DEPTH        29   01/14/1979
TOTALS           44.8              36.3     8.5     13.8
SINCE 7/1        14.1               9.6     4.5      5.4
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= TRACE      59              28.0    31.0       39
DAYS >= 1.0        15              11.4     3.6        4
GREATEST
 SNOW DEPTH        12   02/12                          6
                        02/11
 24 HR TOTAL      7.8   MM                           3.9

DEGREE_DAYS
HEATING TOTAL    6281              6339     -58     5435
 SINCE 7/1         MM              2411      MM       MM
COOLING TOTAL    1290               842     448      991
 SINCE 1/1       1290               843     447      991

FREEZE DATES
RECORD
 EARLIEST     09/22/1995
 LATEST       05/25/1992
EARLIEST                        10/15
LATEST                          04/23
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.4
HIGHEST WIND SPEED/DIRECTION    39/020    DATE  11/26
HIGHEST GUST SPEED/DIRECTION    60/310    DATE  10/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR           65
NUMBER OF DAYS PC            144
NUMBER OF DAYS CLOUDY        156

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             47     MIXED PRECIP                0
HEAVY RAIN               37     RAIN                       64
LIGHT RAIN              137     FREEZING RAIN               0
LT FREEZING RAIN          5     HAIL                        0
HEAVY SNOW                2     SNOW                       15
LIGHT SNOW               55     SLEET                       6
FOG                     176     FOG W/VIS <= 1/4 MILE      15
HAZE                    110

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

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