Climatological Report (Monthly)
Issued by NWS

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CXUS53 KLOT 012255 CCA
CLMORD

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
712 AM CST THU JAN 1 2015

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

...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR THE MONTH OF DECEMBER
2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2014

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            50   12/26        MM     MM        56  12/04
                        12/14
LOWEST              4   12/31        MM     MM        -6  12/10
AVG. MAXIMUM     36.9              34.8     2.1     31.1
AVG. MINIMUM     27.1              20.7     6.4     15.6
MEAN             32.0              27.7     4.3     23.4
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      8              11.4    -3.4       16
DAYS MIN <= 32     24              26.0    -2.0       26
DAYS MIN <= 0       0               1.5    -1.5        5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.56   1982
 MINIMUM         0.16   1896
TOTALS           0.79              2.25   -1.46     1.94
DAILY AVG.       0.03              0.07   -0.04     0.06
DAYS >= .01         5              11.0    -6.0       18
DAYS >= .10         3               5.0    -2.0        6
DAYS >= .50         0               1.2    -1.2        0
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.51   12/22 TO 12/23

SNOWFALL (INCHES)
RECORDS
 TOTAL           33.3   1951
TOTALS              T               8.5    -8.5     14.2
SINCE 7/1         2.9               9.6    -6.7     15.1
SNOWDEPTH AVG.      0                 2      -2        1
DAYS >= 1.0         0               2.5    -2.5        4
GREATEST
 SNOW DEPTH         0   MM                             5  12/16
 24 HR TOTAL        T   12/22 TO 12/22

DEGREE_DAYS
HEATING TOTAL    1015              1155    -140     1283
 SINCE 7/1       2458              2411      47     2566
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        799               843     -44      933
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.8
HIGHEST WIND SPEED/DIRECTION    31/270    DATE  12/27
HIGHEST GUST SPEED/DIRECTION    39/270    DATE  12/27
SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC              4
NUMBER OF DAYS CLOUDY         24

AVERAGE RH (PERCENT)     75

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                6     SLEET                      2
FOG                      15     FOG W/VIS <= 1/4 MILE      1
HAZE                      9


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

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