National Weather Service Weather Forecast Office

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
0933 AM CDT THU NOV 1 2012

...A LOOK BACK AT THE CLIMATE FOR THE MONTH OF OCTOBER 2012 FOR
CHICAGO AND ROCKFORD...

AT CHICAGO...THE AVERAGE HIGH TEMPERATURE WAS 60.5 DEGREES WHICH IS
1.8 DEGREES BELOW NORMAL. THE AVERAGE LOW TEMPERATURE WAS 42.4
DEGREES WHICH IS 0.4 DEGREE BELOW NORMAL.  THE AVERAGE TEMPERATURE
FOR THE MONTH WAS 51.5 DEGREES WHICH IS 1.0 DEGREE BELOW NORMAL.
3.15 INCHES OF PRECIPITATION WAS RECORDED WHICH IS NORMAL. NO SNOW
WAS RECORDED WHICH IS 0.3 INCH BELOW NORMAL.

NO RECORDS WERE SET OR TIED AT CHICAGO FOR THE MONTH OF OCTOBER.

AT ROCKFORD...THE AVERAGE HIGH TEMPERATURE WAS 61.1 DEGREES WHICH
IS 1.6 DEGREES BELOW NORMAL.  THE AVERAGE LOW TEMPERATURE WAS 39.8
DEGREES WHICH IS 0.9 DEGREE BELOW NORMAL.  THE AVERAGE TEMPERATURE
FOR THE MONTH WAS 50.5 DEGREES WHICH IS 1.2 DEGREES BELOW NORMAL.
2.42 INCHES OF PRECIPITATION WAS RECORDED WHICH IS 0.25 INCH BELOW
NORMAL. NO SNOW WAS RECORDED WHICH IS 0.1 INCH BELOW NORMAL.

NO RECORDS WERE SET OR TIED AT ROCKFORD FOR THE MONTH OF OCTOBER.

$$

Another Month Cooler Than Normal...

   While it ended up not being that far below normal, October was the second consecutive month at Chicago cooler than normal.  The last time there were two consecutive months with cooler than normal temperatures was April & May of 2011.  Similarly for Rockford, this month finished slightly below normal, which is the third consecutive month cooler than normal for the city.  This is the first three consecutive month stretch of cooler than normal monthly temperatures since December 2009-February 2010.

Maps

October 2012 Precipitation Total	October 2012 Precipitation Departure From Mean

Chicago

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
835 AM CDT THU NOV 1 2012

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

...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR THE MONTH OF OCTOBER
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              94   10/06/1963
 LOW               14   10/25/1887
HIGHEST            78   10/24         M       M       84  10/07
LOWEST             32   10/08         M       M       33  10/30
AVG. MAXIMUM     60.5              62.3    -1.8     65.2
AVG. MINIMUM     42.4              42.8    -0.4     44.6
MEAN             51.5              52.5    -1.0     54.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               3.5    -2.5        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        12.06   1954
 MINIMUM         0.18   1897
TOTALS           3.15              3.15    0.00     1.98
DAILY AVG.       0.10              0.10    0.00     0.06
DAYS >= .01        12              10.2     1.8       10
DAYS >= .10         8               5.9     2.1        6
DAYS >= .50         3               2.1     0.9        1
DAYS >= 1.00        0               0.6    -0.6        0
GREATEST
 24 HR. TOTAL    0.81   10/22 TO 10/22

SNOWFALL (INCHES)
RECORDS
 TOTAL            6.3   1989
TOTALS            0.0               0.2    -0.2      0.0
SINCE 7/1         0.0               0.2    -0.2      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.1    -0.1        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   10/29 TO 10/29

DEGREE_DAYS
HEATING TOTAL     415               397      18      321
 SINCE 7/1        522               515       7      468
COOLING TOTAL       3                11      -8       14
 SINCE 1/1       1324               843     481     1036
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              11.4
HIGHEST WIND SPEED/DIRECTION    32/320    DATE  10/14
HIGHEST GUST SPEED/DIRECTION    45/360    DATE  10/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY         12

AVERAGE RH (PERCENT)     67

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       7
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

$$

Rockford

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
835 AM CDT THU NOV 1 2012

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

...THE ROCKFORD IL CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2012...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1905 TO 2012

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              91   10/02/1922
 LOW                7   10/30/1925
HIGHEST            79   10/24         M       M       83  10/07
LOWEST             28   10/27         M       M       28  10/31
AVG. MAXIMUM     61.1              62.7    -1.6     65.5
AVG. MINIMUM     39.8              40.7    -0.9     42.0
MEAN             50.5              51.7    -1.2     53.7
DAYS MAX >= 90      0               0.1    -0.1        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      7               5.1     1.9        3
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.32   1969
 MINIMUM         0.01   1952
TOTALS           2.42              2.67   -0.25     1.58
DAILY AVG.       0.08              0.09   -0.01     0.05
DAYS >= .01        10               9.4     0.6        9
DAYS >= .10         7               5.3     1.7        4
DAYS >= .50         2               1.6     0.4        1
DAYS >= 1.00        0               0.5    -0.5        0
GREATEST
 24 HR. TOTAL    0.85   10/17 TO 10/18

SNOWFALL (INCHES)
RECORDS
 TOTAL            5.0   1929
TOTALS            0.0               0.1    -0.1      0.0
SINCE 7/1         0.0               0.1    -0.1      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   10/29 TO 10/29

DEGREE_DAYS
HEATING TOTAL     447               422      25      356
 SINCE 7/1        593               553      40      522
COOLING TOTAL       6                 9      -3       14
 SINCE 1/1       1227               820     407     1019
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.6
HIGHEST WIND SPEED/DIRECTION    31/170    DATE  10/16
HIGHEST GUST SPEED/DIRECTION    41/290    DATE  10/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            9
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     67

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       6
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

$$

For a climate summary for Romeoville, click here.