Explanation of the Preliminary Monthly Climate Data (F6) Product

These data are preliminary and have not undergone final quality control by the National Climatic Data Center (NCDC). Therefore, these data are subject to revision. Final and certified climate data can be accessed at the NCDC - http://www.ncdc.noaa.gov.

WFO Monthly/Daily Climate Data


000
CXUS56 KMTR 100900
CF6SFO
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   SAN FRANCISCO AIRPORT
                                          MONTH:     MAY
                                          YEAR:      2021
                                          LATITUDE:   37 37 N
                                          LONGITUDE: 122 23 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  61  53  57  -2   8   0    T    M    M 21.1 44 280   M    M   6 18     54 280
 2  67  52  60   1   5   0 0.00    M    M 21.2 40 280   M    M   1 8      48 290
 3  77  50  64   5   1   0 0.00    M    M 12.7 31 280   M    M   1 8      35 280
 4  72  54  63   4   2   0 0.00    M    M 15.2 30 290   M    M   0 8      34 300
 5  70  51  61   2   4   0 0.00    M    M 13.3 33 290   M    M   2 8      37 290
 6  64  50  57  -2   8   0 0.00    M    M 17.6 32 280   M    M   4 8      39 270
 7  66  52  59   0   6   0 0.00    M    M 19.1 35 280   M    M   2 8      43 280
 8  79  50  65   6   0   0 0.00    M    M 14.6 31 280   M    M   0 8      35 280
 9  76  54  65   6   0   0 0.00    M    M 17.6 32 280   M    M   3 8      37 280
================================================================================
SM  632  466        34   0     T    M    152.4          M       19
================================================================================
AV 70.2 51.8                              16.9 FASTST   M    M   2    MAX(MPH)
                                 MISC ---->    44 280                 54 280
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

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

                                          STATION:   SAN FRANCISCO AIRPORT
                                          MONTH:     MAY
                                          YEAR:      2021
                                          LATITUDE:   37 37 N
                                          LONGITUDE: 122 23 W

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

AVERAGE MONTHLY: 61.0   TOTAL FOR MONTH:      T    1 = FOG OR MIST
DPTR FM NORMAL:   2.0   DPTR FM NORMAL:   -0.18    2 = FOG REDUCING VISIBILITY
HIGHEST:    79 ON  8    GRTST 24HR     T ON  1- 1      TO 1/4 MILE OR LESS
LOWEST:     50 ON  8, 6                             3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:  M            5 = HAIL
                        GRTST 24HR    M  ON   M    6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:  M  ON   M    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:   0
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   0
MIN 32 OR BELOW:   0    0.50 INCH OR MORE:   0
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.    34    CLEAR  (SCALE 0-3)   7
DPTR FM NORMAL   -23    PTCLDY (SCALE 4-7)   2
TOTAL FM JUL 1  1939    CLOUDY (SCALE 8-10)  0
DPTR FM NORMAL  -327

[CDD (BASE 65) ]
TOTAL THIS MO.     0
DPTR FM NORMAL     0    [PRESSURE DATA]
TOTAL FM JAN 1     9    HIGHEST SLP M ON M
DPTR FM NORMAL     3    LOWEST  SLP 29.85 ON  9

[REMARKS]