Climatological Report (Monthly)
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000
CXUS53 KLOT 011401
CLMORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
858 AM CDT SUN OCT 1 2017

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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             101   09/02/1953
                        09/01/1953
 LOW               29   09/23/1995
                        09/30/1984
                        09/28/1942
HIGHEST            95   09/23                         91  09/06
LOWEST             49   09/06                         50  09/28
AVG. MAXIMUM     79.7              74.8     4.9     77.7
AVG. MINIMUM     59.1              54.3     4.8     61.4
MEAN             69.4              64.6     4.8     69.6
DAYS MAX >= 90      7               1.0     6.0        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.1    -0.1        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        14.17   1961
 MINIMUM         0.01   1979
TOTALS           0.32              3.21   -2.89     1.76
DAILY AVG.       0.01              0.11   -0.10     0.06
DAYS >= .01         2               8.3    -6.3       11
DAYS >= .10         1               5.4    -4.4        5
DAYS >= .50         0               2.0    -2.0        1
DAYS >= 1.00        0               0.8    -0.8        0
GREATEST
 24 HR. TOTAL    0.25   09/02 TO 09/02           09/21 TO 09/21
                                                          09/30 TO 09/30
                                                          09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL      37               105     -68       23
 SINCE 7/1         42               118     -76       23
COOLING TOTAL     179                92      87      165
 SINCE 1/1        962               832     130     1130
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
RESULTANT WIND SPEED/DIRECTION   0/079
HIGHEST WIND SPEED/DIRECTION    26/320    DATE  09/05
HIGHEST GUST SPEED/DIRECTION    36/210    DATE  09/16


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN                5     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      0
HAZE                     18

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

$$




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