Climatological Report (Monthly)
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189
CXUS53 KLOT 011255
CLMORD


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

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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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              71   12/02/1982
                        12/03/1970
 LOW              -25   12/24/1983
HIGHEST            65   12/04                         54  12/26
LOWEST             -4   12/27                        -13  12/19
AVG. MAXIMUM     34.2              34.8    -0.6     31.1
AVG. MINIMUM     20.1              20.7    -0.6     18.9
MEAN             27.2              27.7    -0.5     25.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     12              11.4     0.6       14
DAYS MIN <= 32     26              26.0     0.0       28
DAYS MIN <= 0       5               1.5     3.5        3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.56   1982
 MINIMUM         0.16   1896
TOTALS           0.59              2.25   -1.66     1.77
DAILY AVG.       0.02              0.07   -0.05     0.06
DAYS >= .01         9              11.0    -2.0       10
DAYS >= .10         2               5.0    -3.0        7
DAYS >= .50         0               1.2    -1.2        1
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.18   12/24 TO 12/24

SNOWFALL (INCHES)
RECORDS
 TOTAL           33.3   1951
TOTALS            5.3               8.2    -2.9     17.7
SINCE 7/1         5.4               9.6    -4.2     17.7
SNOWDEPTH AVG.      0                 2      -2        2
DAYS >= 1.0         2               2.5    -0.5
GREATEST
 SNOW DEPTH         2   12/31
                        12/30
                        12/29
 24 HR TOTAL      1.8   12/24 TO 12/24

DEGREE_DAYS
HEATING TOTAL    1165              1155      10     1231
 SINCE 7/1       2208              2411    -203     2060
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        991               843     148     1157
.....................................................

WIND (MPH)
AVERAGE WIND SPEED              10.6
RESULTANT WIND SPEED/DIRECTION   6/273
HIGHEST WIND SPEED/DIRECTION    38/250    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    50/280    DATE  12/05


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW               13     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      0
HAZE                     14

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

&&

RECORDS ESTABLISHED IN DECEMBER 2017
* TIED RECORD LOW MAXIMUM TEMPERATURE OF 5 DEGREES ON THE 26TH
* TIED FOR 12TH DRIEST DECEMBER ON RECORD SINCE 1871

$$




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