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Climatological Report (Monthly)
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CXUS53 KLOT 011259
CLMORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
645 AM CST TUE JAN 1 2013

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

...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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              71   12/02/1982
                        12/03/1970
 LOW              -25   12/24/1983
HIGHEST            70   12/03        35      35       57  12/15
LOWEST             14   12/30        20      -6       12  12/10
AVG. MAXIMUM     42.5              34.8     7.7     41.8
AVG. MINIMUM     29.7              20.7     9.0     28.6
MEAN             36.1              27.7     8.4     35.2
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      3              11.4    -8.4        4
DAYS MIN <= 32     22              26.0    -4.0       22
DAYS MIN <= 0       0               1.5    -1.5        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.56   1982
 MINIMUM         0.16   1896
TOTALS           2.21              2.25   -0.04     2.65
DAILY AVG.       0.07              0.07    0.00     0.09
DAYS >= .01        10              11.0    -1.0       15
DAYS >= .10         4               5.0    -1.0        3
DAYS >= .50         1               1.2    -0.2        1
DAYS >= 1.00        1               0.3     0.7        1
GREATEST
 24 HR. TOTAL    1.32   12/19 TO 12/20

SNOWFALL (INCHES)
RECORDS
 TOTAL           33.3   1951
TOTALS            0.9               8.2    -7.3      1.7
SINCE 7/1         0.9               9.6    -8.7      1.7
SNOWDEPTH AVG.      0                 2      -2        0
DAYS >= 1.0         0               2.5    -2.5        1
GREATEST
 SNOW DEPTH         T   12/21                          1  12/09
 24 HR TOTAL      0.3   12/28 TO 12/28

DEGREE_DAYS
HEATING TOTAL     887              1155    -268      916
 SINCE 7/1       2137              2411    -274     1979
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1324               843     481     1036
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.2
HIGHEST WIND SPEED/DIRECTION    36/310    DATE  12/21
HIGHEST GUST SPEED/DIRECTION    45/320    DATE  12/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY         20

AVERAGE RH (PERCENT)     77

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               1
HEAVY RAIN                2     RAIN                       4
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW               12     SLEET                      0
FOG                      17     FOG W/VIS <= 1/4 MILE      3
HAZE                     10

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

&&

NO RECORDS SET FOR DECEMBER

$$
National Weather Service Weather Forecast Office
