Climatological Report (Annual)
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000
CXUS53 KLOT 011331
CLAORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
727 AM CST SUN JAN 1 2012

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

...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR THE YEAR OF 2011...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2011

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH             105   07/24/1934
 LOW              -27   01/20/1985
HIGHEST            99   07/21        MM      MM
                        07/20
LOWEST             -9   02/10        MM      MM
AVG. MAXIMUM     58.9              59.1    -0.2
AVG. MINIMUM     42.4              40.8     1.6
MEAN             50.7              49.9     0.8
DAYS MAX >= 90     22              14.0     8.0
DAYS MAX <= 32     44              42.7     1.3
DAYS MIN <= 32    113             121.8    -8.8
DAYS MIN <= 0       4               7.1    -3.1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        50.86   2008
 MINIMUM        22.22   1962
TOTALS          49.83             36.89   12.94
DAILY AVG.       0.14              0.10    0.04
DAYS >= .01       142             124.1    17.9
DAYS >= .10        83              69.1    13.9
DAYS >= .50        30              22.7     7.3
DAYS >= 1.00       11               8.3     2.7
GREATEST
 24 HR. TOTAL    8.21   07/22 TO 07/23
 STORM TOTAL       MM
 (MM/DD(HH))            MM

SNOWFALL (INCHES)
RECORDS
 TOTAL           95.3   1978
 24 HR TOTAL       MM
 SNOW DEPTH        99   MM
TOTALS           43.4              36.7     6.7
 LIQUID EQUIV    4.34                MM      MM
SINCE 7/1         1.7              10.0    -8.3
 LIQUID 7/1      0.17              1.00   -0.83
SNOWDEPTH AVG.      1                MM      MM
DAYS >= TRACE      56              28.5    27.5
DAYS >= 1.0         8              11.6    -3.6
GREATEST
 SNOW DEPTH        21   02/08
 24 HR TOTAL     13.6   02/01 TO 02/01
 STORM TOTAL       MM
 (MM/DD(HH))            MM

DEGREE_DAYS
HEATING TOTAL    6134              6339    -205
 SINCE 7/1         MM              2411      MM
COOLING TOTAL    1036               842     194
 SINCE 1/1       1036               843     193

FREEZE DATES
EARLIEST                        10/15
LATEST                          04/23
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.4
HIGHEST WIND SPEED/DIRECTION    55/210    DATE  06/21
HIGHEST GUST SPEED/DIRECTION    70/200    DATE  06/21



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

$$
ACS



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