620
CXUS56 KSGX 010940
CLMONT

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN DIEGO, CA
240 AM PDT WED OCT 01 2025

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

...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH            118   09/05/2020
 LOW              51   09/27/2013
HIGHEST          102   09/02         91      11      114  09/06
LOWEST            61   09/12         62      -1       55  09/17
AVG. MAXIMUM    89.6               91.3    -1.7     90.9
AVG. MINIMUM    66.3               63.8     2.5     64.3
MEAN            77.9               77.6     0.3     77.6
DAYS MAX >= 90    15               17.5    -2.5       13
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MAX >= 45    30                                  30
DAYS MAX >= 120    0                                   0
DAYS MIN <= 32     0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.54   1963
 MINIMUM        0.00   2020
TOTALS          0.12               0.10    0.02        T
DAILY AVG.      0.00               0.00   -0.00        T
DAYS >= .01        2                0.7     1.3        0
DAYS >= .10        0                0.3    -0.3        0
DAYS >= .50        0                0.0     0.0        0
DAYS >= 1.00       0                0.0     0.0        0
DAYS >= %-5.2F     0                                   0
DAYS >= %-5.2F     0                                   0
GREATEST
 24 HR. TOTAL   0.09   09/18 TO 09/18                  T  09/20 TO 09/20
                                                          09/16 TO 09/16
                                                          09/20 TO 09/20
 STORM TOTAL    0.09                                0.00
 (MM/DD(HH))            MM


DEGREE DAYS
HEATING TOTAL      0                  1      -1        0
 SINCE 7/1         0                  0       0       MM
COOLING TOTAL    400                378      22      386
 SINCE 1/1      1789               1751      38       MM

FREEZE DATES
RECORD
 EARLIEST     11/30/2004
 LATEST       02/14/2006
EARLIEST                        02/24
LATEST                          02/20
................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.8
RESULTANT WIND SPEED/DIRECTION   5/240
HIGHEST WIND SPEED/DIRECTION    22/230    DATE  09/17
HIGHEST GUST SPEED/DIRECTION    30/260    DATE  09/03

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.33
NUMBER OF DAYS FAIR           17
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     56

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

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

$$