Climatological Report (Annual)
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CXUS53 KLOT 011343
CLAORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
737 AM CST MON JAN 1 2018

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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE YEAR OF 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017

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            95   09/23        MM      MM       93  07/24
                        06/12                             06/20
LOWEST             -4   12/27        MM      MM      -13  12/19
AVG. MAXIMUM     61.3              59.1     2.2     60.7
AVG. MINIMUM     43.8              40.8     3.0     43.8
MEAN             52.6              49.9     2.7     52.3
DAYS MAX >= 90     16              14.0     2.0       16
DAYS MAX <= 32     30              42.7   -12.7       40
DAYS MIN <= 32    102             121.8   -19.8      108
DAYS MIN <= 0       7               7.1    -0.1        8

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        50.86   2008
 MINIMUM        22.22   1962
TOTALS          43.10             36.89    6.21    35.97
DAILY AVG.       0.12              0.10    0.02     0.10
DAYS >= .01       122             124.1    -2.1      130
DAYS >= .10        74              69.1     4.9       79
DAYS >= .50        27              22.7     4.3       26
DAYS >= 1.00        9               8.3     0.7        6
GREATEST
 24 HR. TOTAL    4.19   10/14 TO 10/14              1.60

SNOWFALL (INCHES)
RECORDS
 TOTAL           95.3   1978
 24 HR TOTAL     18.6   01/02/1999
 SNOW DEPTH        29   01/14/1979
TOTALS           13.8              36.3   -22.5     33.2
SINCE 7/1         5.4               9.6    -4.2     17.7
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= TRACE      39              28.0    11.0       55
DAYS >= 1.0         4              11.4    -7.4       10
GREATEST
 SNOW DEPTH         6   03/14                          6
 24 HR TOTAL      3.9   03/13 TO 03/13               6.4

DEGREE_DAYS
HEATING TOTAL    5435              6339    -904     5715
 SINCE 7/1         MM              2411      MM       MM
COOLING TOTAL     991               842     149     1157
 SINCE 1/1        991               843     148     1157

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

WIND (MPH)
AVERAGE WIND SPEED              10.0
HIGHEST WIND SPEED/DIRECTION    41/270    DATE  03/08
HIGHEST GUST SPEED/DIRECTION    57/270    DATE  03/08

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR           57
NUMBER OF DAYS PC            168
NUMBER OF DAYS CLOUDY        140

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             56     MIXED PRECIP               0
HEAVY RAIN               43     RAIN                      58
LIGHT RAIN              141     FREEZING RAIN              0
LT FREEZING RAIN          2     HAIL                       3
HEAVY SNOW                1     SNOW                       8
LIGHT SNOW               33     SLEET                      4
FOG                     138     FOG W/VIS <= 1/4 MILE     13
HAZE                    105

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

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