859
CXUS53 KLOT 011255
CLMORD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
655 AM CST SUN NOV 1 2009
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...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2009...
CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1871 TO 2009
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 94 10/06/1963
LOW 14 10/25/1887
HIGHEST 69 10/21 63 6 84 10/12
LOWEST 29 10/11 43 -14 31 10/30
10/28
AVG. MAXIMUM 55.2 62.1 -6.9 61.6
AVG. MINIMUM 42.5 42.1 0.4 43.7
MEAN 48.9 52.1 -3.2 52.7
DAYS MAX >= 90 0 0.1 -0.1 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 3 4.2 -1.2 3
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 12.06 1954
MINIMUM 0.18 1897
TOTALS 6.04 2.71 3.33 2.07
DAILY AVG. 0.19 0.09 0.10 0.07
DAYS >= .01 19 9.5 9.5 9
DAYS >= .10 12 5.2 6.8 6
DAYS >= .50 5 1.8 3.2 1
DAYS >= 1.00 1 0.5 0.5 0
GREATEST
24 HR. TOTAL 1.78 10/22 TO 10/23
SNOWFALL (INCHES)
RECORDS
TOTAL 6.3 1989
TOTALS T 0.3 -0.3 T
SINCE 7/1 T 0.3 -0.3 T
SNOWDEPTH AVG. 0 0 0 0
DAYS >= 1.0 0 0.1 -0.1 0
GREATEST
SNOW DEPTH 0 MM 0 MM
24 HR TOTAL T 10/16 TO 10/16
DEGREE_DAYS
HEATING TOTAL 493 401 92 387
SINCE 7/1 570 528 42 440
COOLING TOTAL 0 10 -10 10
SINCE 1/1 589 830 -241 828
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WIND (MPH)
AVERAGE WIND SPEED 9.3
HIGHEST WIND SPEED/DIRECTION 33/270 DATE 10/06
HIGHEST GUST SPEED/DIRECTION 47/260 DATE 10/06
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
NUMBER OF DAYS FAIR 2
NUMBER OF DAYS PC 8
NUMBER OF DAYS CLOUDY 21
AVERAGE RH (PERCENT) 75
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 5
LIGHT RAIN 22 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 1
FOG 19 FOG W/VIS <= 1/4 MILE 0
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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