Climatological Report (Monthly)
Issued by NWS Chicago, IL

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000
CXUS53 KLOT 011255
CLMLOT


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

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

...THE ROMEOVILLE  WFO CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1992 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              71   12/03/2012
 LOW              -12   12/19/2016
                        12/18/2016
                        03/08/2000
HIGHEST            64   12/04        MM      MM       54
LOWEST             -9   12/27        MM      MM      -12
AVG. MAXIMUM     34.0              34.7    -0.7     30.8
AVG. MINIMUM     18.0              20.0    -2.0     17.9
MEAN             26.0              27.4    -1.4     24.4

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.85   2015
 MINIMUM         0.58   1995
TOTALS           0.48R             2.25   -1.77     1.52
DAILY AVG.       0.02              0.07   -0.05     0.05
DAYS >= .01         7              10.9    -3.9        9
DAYS >= .10         2               5.5    -3.5        4
DAYS >= .50         0               1.4    -1.4        1
DAYS >= 1.00        0               0.4    -0.4        0
GREATEST
 24 HR. TOTAL    0.24   12/24 TO 12/24

SNOWFALL (INCHES)
RECORDS
 TOTAL           30.0   2000
TOTALS            5.4               9.3    -3.9     17.2
SINCE 7/1         5.4              10.2    -4.8     17.2
SNOWDEPTH AVG.      0                MM      MM        3
DAYS >= 1.0         2               3.2    -1.2
GREATEST
 SNOW DEPTH         4   12/31
                        12/30
 24 HR TOTAL      2.1   12/24 TO 12/24

DEGREE_DAYS
HEATING TOTAL    1201              1167      34     1253
 SINCE 7/1       2312              2386     -74     2109
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        875               862      13     1145
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.9
HIGHEST WIND SPEED/DIRECTION    33/270    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    45/270    DATE  12/05

AVERAGE RH (PERCENT)     71


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

$$



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