848
CXUS56 KSGX 020927
CLMONT

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN DIEGO, CA
227 AM PDT FRI OCT 02 2026

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

...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2026

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          109   09/09         91      18      102  09/02
LOWEST            61   09/19         62      -1       61  09/12
                       09/29
AVG. MAXIMUM    89.9               91.3    -1.4     89.6
AVG. MINIMUM    66.7               63.8     2.9     66.3
MEAN            78.3               77.6     0.7     77.9
DAYS MAX >= 90    14               17.5    -3.5       15
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          0.56               0.10    0.46     0.12
DAILY AVG.      0.02               0.00    0.02     0.00
DAYS >= .01        2                0.7     1.3        2
DAYS >= .10        1                0.3     0.7        0
DAYS >= .50        1                0.0     1.0        0
DAYS >= 1.00       0                0.0     0.0        0
DAYS >= %-5.2F     0                                   0
DAYS >= %-5.2F     0                                   0
GREATEST
 24 HR. TOTAL   0.56   09/06 TO 09/07               0.09  09/18 TO 09/18
 STORM TOTAL    0.55                                0.09
 (MM/DD(HH))            MM


DEGREE DAYS
HEATING TOTAL      0                  1      -1        0
 SINCE 7/1         0                  0       0       MM
COOLING TOTAL    409                378      31      400
 SINCE 1/1      2221               1751     470       MM

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

WIND (MPH)
AVERAGE WIND SPEED              5.4
RESULTANT WIND SPEED/DIRECTION   4/240
HIGHEST WIND SPEED/DIRECTION    22/270    DATE  09/08
HIGHEST GUST SPEED/DIRECTION    32/250    DATE  09/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     56

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      8

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

$$