770
CXUS56 KSGX 010949
CLMONT

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN DIEGO, CA
249 AM PDT MON JUN 01 2026

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

...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR THE MONTH OF MAY 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            103   05/13/2013
                       05/12/2013
                       05/03/2004
 LOW              42   05/01/1999
HIGHEST           96   05/11         80      16      103  05/10
LOWEST            49   05/06         53      -4       53  05/04
                                                          05/05
                                                          05/14
AVG. MAXIMUM    79.2               79.8    -0.6     80.9
AVG. MINIMUM    56.5               55.6     0.9     57.7
MEAN            67.8               67.7     0.1     69.3
DAYS MAX >= 90     3                5.0    -2.0        7
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MAX >= 45    31                                  31
DAYS MAX >= 120    0                                   0
DAYS MIN <= 32     0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        2.52   1977
 MINIMUM        0.00   1983
TOTALS          0.21               0.30   -0.09     0.25
DAILY AVG.      0.01               0.01   -0.00     0.01
DAYS >= .01        4                1.7     2.3        3
DAYS >= .10        1                0.9     0.1        1
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   0.17   05/05 TO 05/05               0.22  05/04 TO 05/05
 STORM TOTAL    0.17                                0.19
 (MM/DD(HH))            MM


DEGREE DAYS
HEATING TOTAL     18                 37     -19       32
 SINCE 7/1       638               1288    -650       MM
COOLING TOTAL    115                121      -6      174
 SINCE 1/1       430                214     216       MM

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

WIND (MPH)
AVERAGE WIND SPEED              7.3
RESULTANT WIND SPEED/DIRECTION   6/250
HIGHEST WIND SPEED/DIRECTION    23/040    DATE  05/19
                                23/270          05/20
HIGHEST GUST SPEED/DIRECTION    35/040    DATE  05/19

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.42
NUMBER OF DAYS FAIR           16
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     60

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      0
HAZE                      9

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

$$