WFO Monthly/Daily Climate Data
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 210620
CF6IAD
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   WASHINGTON DULLES DC
                                          MONTH:     SEPTEMBER
                                          YEAR:      2017
                                          LATITUDE:   38 57 N
                                          LONGITUDE:  77 27 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  69  58  64  -9   1   0    T  0.0    0  7.0 16  30   M    M   9        21  30
 2  61  53  57 -16   8   0 0.66  0.0    0  5.7 13  50   M    M   9 1      16  50
 3  78  59  69  -3   0   4    T  0.0    0  5.4 15 290   M    M   6 1      22 290
 4  82  55  69  -3   0   4 0.00  0.0    0  7.5 17 190   M    M   2        23 190
 5  86  65  76   4   0  11 0.32  0.0    0  7.5 20 200   M    M   6 13     27 200
 6  68  59  64  -8   1   0 0.65  0.0    0  4.5 13 350   M    M   9 1      17 330
 7  72  50  61 -10   4   0 0.00  0.0    0  6.1 18 290   M    M   5 12     26 290
 8  76  48  62  -9   3   0 0.00  0.0    0  5.3 16 280   M    M   5        22 290
 9  71  50  61 -10   4   0 0.00  0.0    0  7.2 15 350   M    M   4        19 360
10  72  47  60 -10   5   0 0.00  0.0    0  5.5 14  50   M    M   2        19  20
11  72  49  61  -9   4   0 0.00  0.0    0  4.3 10  80   M    M   6        15  80
12  77  57  67  -3   0   2 0.00  0.0    0  3.7  9 120   M    M   7        12 110
13  78  62  70   1   0   5 0.09  0.0    0  4.0 14 200   M    M   7 1      19 200
14  80  65  73   4   0   8 0.03  0.0    0  4.3 12 290   M    M   8        13 280
15  82  62  72   4   0   7 0.00  0.0    0  4.6 12 340   M    M   4 1      17 310
16  84  59  72   4   0   7 0.00  0.0    0  2.4  8 110   M    M   4 1      11 310
17  83  62  73   5   0   8 0.00  0.0    0  3.4 12 130   M    M   5 1      15 130
18  80  62  71   4   0   6 0.00  0.0    0  5.7 15 110   M    M   6 1      18 100
19  82  65  74   7   0   9 0.00  0.0    0  8.4 15 340   M    M   5        19 360
20  87  61  74   8   0   9 0.00  0.0    0  5.2 15 300   M    M   3        19 320
================================================================================
SM 1540 1148        30  80  1.75     0.0 107.7          M      112
================================================================================
AV 77.0 57.4                               5.4 FASTST   M    M   6    MAX(MPH)
                                 MISC ---->  # 20 200               # 27  200
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

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

                                          STATION:  WASHINGTON DULLES DC
                                          MONTH:    SEPTEMBER
                                          YEAR:     2017
                                          LATITUDE:   38 57 N
                                          LONGITUDE:  77 27 W

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

AVERAGE MONTHLY: 67.2   TOTAL FOR MONTH:   1.75    1 = FOG OR MIST
DPTR FM NORMAL:  -2.8   DPTR FM NORMAL:   -0.86    2 = FOG REDUCING VISIBILITY
HIGHEST:    87 ON 20    GRTST 24HR  0.66 ON  2- 2      TO 1/4 MILE OR LESS
LOWEST:     47 ON 10                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   0.0 INCH    5 = HAIL
                        GRTST 24HR     0.0         6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:   0           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:   0    0.01 INCH OR MORE:   5
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   3
MIN 32 OR BELOW:   0    0.50 INCH OR MORE:   2
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.    30    CLEAR  (SCALE 0-3)   3
DPTR FM NORMAL    12    PTCLDY (SCALE 4-7)  14
TOTAL FM JUL 1    31    CLOUDY (SCALE 8-10)  3
DPTR FM NORMAL    11

[CDD (BASE 65) ]
TOTAL THIS MO.    80
DPTR FM NORMAL   -37    [PRESSURE DATA]
TOTAL FM JAN 1  1141    HIGHEST SLP M ON M
DPTR FM NORMAL     8    LOWEST  SLP 29.73 ON  5

[REMARKS]



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