000
CXUS55 KLOT 310700
CF6ORD
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   CHICAGO-OHARE
                                          MONTH:     DECEMBER
                                          YEAR:      2011
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  48  25  37   4  28   0    T    T    0  6.9 17 340   M    M   8 1      23  10
 2  43  31  37   5  28   0 0.02    T    0  6.9 16 160   M    M   6 1      20 170
 3  50  37  44  12  21   0 0.33  0.0    0 13.2 30 190   M    M  10 1      40 180
 4  52  36  44  13  21   0 0.02  0.0    0 12.7 28 210   M    M  10 18     36 210
 5  40  35  38   7  27   0 0.08    T    0  8.9 16  40   M    M  10 1      25  50
 6  37  27  32   1  33   0    T    T    0  8.1 18  20   M    M   8 18     24  20
 7  34  25  30   0  35   0 0.00  0.0    0  9.2 20 250   M    M   5        25 250
 8  36  24  30   0  35   0 0.00  0.0    0  6.3 15 280   M    M  10        20 270
 9  32  18  25  -4  40   0 0.03  0.5    1  9.0 16 280   M    M   5 1      22 300
10  27  12  20  -9  45   0 0.00  0.0    0  9.3 14 210   M    M   2        20 220
11  45  27  36   7  29   0 0.00  0.0    0 11.5 21 210   M    M   0        24 200
12  47  23  35   7  30   0 0.00  0.0    0  6.1 13 200   M    M   5 18     15 210
13  45  38  42  14  23   0 0.09  0.0    0  4.0  9 170   M    M  10 18     12 150
14  55  41  48  20  17   0 1.43  0.0    0 13.2 25 200   M    M  10 1      31 200
15  57  33  45  17  20   0 0.02  0.0    0 17.9 30 300   M    M   9 1      39 270
16  34  26  30   3  35   0 0.00  0.0    0  6.3 15 310   M    M   4        18 340
17  32  28  30   3  35   0 0.06  1.2    0  4.7 12 250   M    M  10 1      15 250
18  44  25  35   8  30   0 0.00  0.0    0  9.3 22 210   M    M   5 128    26 210
19  50  38  44  18  21   0    T  0.0    0 11.5 18 230   M    M   8        31  40
20  39  36  38  12  27   0    T  0.0    0  7.7 16  50   M    M  10 1      30  60
21  43  37  40  14  25   0 0.01  0.0    0  6.0 16 280   M    M  10 1      21 250
22  40  31  36  10  29   0 0.02    T    0  8.1 21 360   M    M   9 18     29  10
23  34  23  29   3  36   0 0.00  0.0    0  8.7 16 240   M    M   5        22 240
24  39  21  30   4  35   0 0.00  0.0    0  9.3 20 210   M    M   1        24 220
25  45  29  37  12  28   0 0.00  0.0    0 11.7 24 310   M    M   4        31 310
26  45  23  34   9  31   0 0.06  0.0    0 11.3 23 220   M    M   4 1      29 210
27  41  26  34   9  31   0 0.06  0.0    0 12.7 29 340   M    M   9 1      35 330
28  31  20  26   1  39   0 0.00  0.0    0  6.3 15 330   M    M   7        18 320
29  48  31  40  15  25   0 0.01  0.0    0  9.4 23 280   M    M   5        31 280
30  44  32  38  13  27   0 0.41  0.0    0  9.0 22  10   M    M  10 1      29 360
================================================================================
SM 1257  858       886   0  2.65     1.7 275.2          M      209
================================================================================
AV 41.9 28.6                               9.2 FASTST   M    M   7    MAX(MPH)
                                 MISC ---->  # 30 190               # 40  180
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:  CHICAGO-OHARE
                                          MONTH:    DECEMBER
                                          YEAR:     2011
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 35.2   TOTAL FOR MONTH:   2.65    1 = FOG OR MIST
DPTR FM NORMAL:   7.4   DPTR FM NORMAL:    0.46    2 = FOG REDUCING VISIBILITY
HIGHEST:    57 ON 15    GRTST 24HR  1.52 ON 13-14      TO 1/4 MILE OR LESS
LOWEST:     12 ON 10                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   1.7 INCHES  5 = HAIL
                        GRTST 24HR   1.2 ON   M    6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:   1 ON  9     7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   4    0.01 INCH OR MORE:  15
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   3
MIN 32 OR BELOW:  21    0.50 INCH OR MORE:   1
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   1

[HDD (BASE 65) ]
TOTAL THIS MO.   886    CLEAR  (SCALE 0-3)   3
DPTR FM NORMAL  -227    PTCLDY (SCALE 4-7)  13
TOTAL FM JUL 1  1949    CLOUDY (SCALE 8-10) 14
DPTR FM NORMAL  -420

[CDD (BASE 65) ]
TOTAL THIS MO.     0
DPTR FM NORMAL     0    [PRESSURE DATA]
TOTAL FM JAN 1  1036    HIGHEST SLP M ON M
DPTR FM NORMAL   193    LOWEST  SLP 28.86 ON 30

[REMARKS]