423
CXUS56 KSGX 010951
CLMONT
CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN DIEGO, CA
251 AM PDT SUN JUN 01 2025
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...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR THE MONTH OF MAY 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
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TEMPERATURE (F)
RECORD
HIGH 103 05/13/2013
05/12/2013
05/03/2004
LOW 42 05/01/1999
HIGHEST 103R 05/10 80 23 83 05/30
LOWEST 53 05/04 53 0 49 05/06
05/05
05/14
AVG. MAXIMUM 80.9 79.8 1.1 75.4
AVG. MINIMUM 57.7 55.6 2.1 54.4
MEAN 69.3 67.7 1.6 64.9
DAYS MAX >= 90 7 5.0 2.0 0
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 0.25 0.30 -0.05 0.15
DAILY AVG. 0.01 0.01 0.00 0.00
DAYS >= .01 3 1.7 1.3 2
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 0.22 05/04 TO 05/05 0.15 05/04 TO 05/05
STORM TOTAL 0.19 0.13
(MM/DD(HH)) MM
DEGREE DAYS
HEATING TOTAL 32 37 -5 34
SINCE 7/1 1134 1288 -154 MM
COOLING TOTAL 174 121 53 36
SINCE 1/1 250 214 36 MM
FREEZE DATES
RECORD
EARLIEST 11/30/2004
LATEST 02/14/2006
EARLIEST 02/24
LATEST 02/20
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WIND (MPH)
AVERAGE WIND SPEED 6.8
RESULTANT WIND SPEED/DIRECTION 6/250
HIGHEST WIND SPEED/DIRECTION 23/270 DATE 05/31
HIGHEST GUST SPEED/DIRECTION 31/260 DATE 05/31
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.47
NUMBER OF DAYS FAIR 10
NUMBER OF DAYS PC 14
NUMBER OF DAYS CLOUDY 5
AVERAGE RH (PERCENT) 59
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 3 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 9 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.
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