Climatological Report (Monthly)
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CXUS56 KSGX 011835
CLMONT


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN DIEGO, CA
1035 AM PST MON JAN 1 2018

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

...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              86   12/24/2005
 LOW               28   12/23/1998
                        12/22/1998
HIGHEST            85   12/10        69      16       79  12/29
LOWEST             35   12/22        44      -9       31  12/25
AVG. MAXIMUM     75.0              65.6     9.4     64.4
AVG. MINIMUM     46.0              42.7     3.3     43.7
MEAN             60.5              54.1     6.4     54.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MAX >= 100     0                                  0
DAYS MAX >= 110     0                                  0
DAYS MIN <= 32      0               0.5    -0.5        1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.73   2010
 MINIMUM         0.00   1963
                        1962
TOTALS              T              2.32   -2.32     3.43
DAILY AVG.          T              0.07   -0.07     0.11
DAYS >= .01         0                MM      MM        9
DAYS >= .10         0                MM      MM        7
DAYS >= .50         0                MM      MM        2
DAYS >= 1.00        0                MM      MM        1
DAYS >= 1.50        0                                  0
DAYS >= 2.00        0                                  0
GREATEST
 24 HR. TOTAL       T   12/20 TO 12/20           12/15 TO 12/16
                                                          12/30 TO 12/30
                                                          12/30 TO 12/30
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    12/16(00) TO 12/16(00)
                                                 12/30(00) TO 12/30(00)0
                                                 12/30(00) TO 12/30(00)0

DEGREE_DAYS
HEATING TOTAL     143               338    -195      333
 SINCE 7/1        187               560    -373      463
COOLING TOTAL      11                 2       9        0
 SINCE 1/1       2295              1707     588     2102

FREEZE DATES
RECORD
 EARLIEST     11/30/2004
 LATEST       02/14/2006
EARLIEST      12/25             MM
LATEST                          MM
.................................................

WIND (MPH)
AVERAGE WIND SPEED              6.6
RESULTANT WIND SPEED/DIRECTION   4/040
HIGHEST WIND SPEED/DIRECTION    41/070    DATE  12/07
HIGHEST GUST SPEED/DIRECTION    60/050    DATE  12/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           15
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     31

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       3     FOG W/VIS <= 1/4 MILE      1
HAZE                     11

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

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