Climatological Report (Monthly)
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CXUS53 KLOT 011330
CLMORD

CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
803 AM CDT SAT SEP 1 2012

...................................
...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2012...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2012

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             102   08/05/1918
 LOW               42   08/28/1986

HIGHEST            95   08/03        MM      MM       93  08/02
LOWEST             53   08/21        MM      MM       57  08/15
                        08/18                             08/11
AVG. MAXIMUM     84.0              81.9     2.1     82.5
AVG. MINIMUM     62.6              62.9    -0.3     64.4
MEAN             73.3              72.4     0.9     73.5

DAYS MAX >= 90     10               3.6     6.4        3
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        17.10   1987
 MINIMUM         0.18   1893

TOTALS           2.07              4.90   -2.83     4.54
DAILY AVG.       0.07              0.16   -0.09     0.15
DAYS >= .01         8               9.8    -1.8        8
DAYS >= .10         5               6.7    -1.7        7
DAYS >= .50         1               2.8    -1.8        5
DAYS >= 1.00        0               1.5    -1.5        1
GREATEST
 24 HR. TOTAL    0.57   08/26 TO 08/26
                        08/25 TO 08/26
                        08/26 TO 08/26

DEGREE_DAYS
HEATING TOTAL       0                 9      -9        0
 SINCE 7/1          0                13     -13        0

COOLING TOTAL     263               238      25      271
 SINCE 1/1       1231               740     491      952
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.0
HIGHEST WIND SPEED/DIRECTION    41/280    DATE  08/04
HIGHEST GUST SPEED/DIRECTION    53/290    DATE  08/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           14
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       6
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      0
HAZE                      3

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

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