Climatological Report (Monthly)
Issued by NWS Chicago, IL

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CXUS53 KLOT 011255
CLMRFD


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

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

...THE ROCKFORD IL CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1905 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              69   12/03/2012
 LOW              -24   12/24/1983
HIGHEST            62   12/04                         48  12/26
LOWEST             -9   12/27                        -13  12/19
AVG. MAXIMUM     32.3              33.2    -0.9     30.1
AVG. MINIMUM     16.8              17.7    -0.9     17.5
MEAN             24.6              25.4    -0.8     23.8
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     13              12.6     0.4       15
DAYS MIN <= 32     29              27.4     1.6       29
DAYS MIN <= 0       6               2.9     3.1        5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.04   1971
 MINIMUM         0.17   1907
TOTALS           0.49              1.98   -1.49     1.88
DAILY AVG.       0.02              0.06   -0.04     0.06
DAYS >= .01         8              10.2    -2.2       11
DAYS >= .10         2               5.0    -3.0        7
DAYS >= .50         0               1.1    -1.1        0
DAYS >= 1.00        0               0.2    -0.2        0
GREATEST
 24 HR. TOTAL    0.14   12/24 TO 12/24


SNOWFALL (INCHES)
RECORDS
 TOTAL           30.1   2000
TOTALS            4.7              11.3    -6.6     16.1
SINCE 7/1         4.9              13.1    -8.2     16.1
SNOWDEPTH AVG.      0                 4      -4        4
DAYS >= 1.0         3               3.1    -0.1
GREATEST
 SNOW DEPTH         3   12/30
 24 HR TOTAL      1.3   12/29 TO 12/29

DEGREE_DAYS
HEATING TOTAL    1245              1226      19     1270
 SINCE 7/1       2459              2561    -102     2139
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        828               820       8     1103
.....................................................

WIND (MPH)
AVERAGE WIND SPEED              9.5
HIGHEST WIND SPEED/DIRECTION    37/300    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    56/260    DATE  12/04


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                4     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       2
LIGHT SNOW               17     SLEET                      1
FOG                      13     FOG W/VIS <= 1/4 MILE      1
HAZE                      5

-  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 FOR 5TH DRIEST DECEMBER ON RECORD SINCE 1905

$$




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