Climatological Report (Monthly)
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
000
CXUS53 KLOT 011158
CLMORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
635 AM CDT THU OCT 1 2015

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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2015

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            92   09/06                         88  09/05
LOWEST             48   09/13                         41  09/13
AVG. MAXIMUM     78.1              74.8     3.3     73.7
AVG. MINIMUM     59.8              54.3     5.5     54.2
MEAN             69.0              64.6     4.4     63.9
DAYS MAX >= 90      3               1.0     2.0        0
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           4.64              3.21    1.43     2.71
DAILY AVG.       0.15              0.11    0.04     0.09
DAYS >= .01         7               8.3    -1.3        9
DAYS >= .10         6               5.4     0.6        6
DAYS >= .50         2               2.0     0.0        2
DAYS >= 1.00        2               0.8     1.2        1
GREATEST
 24 HR. TOTAL    2.41   09/18 TO 09/18

DEGREE_DAYS
HEATING TOTAL      37               105     -68      106
 SINCE 7/1         55               118     -63      111
COOLING TOTAL     164                92      72       81
 SINCE 1/1        805               832     -27      796
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
HIGHEST WIND SPEED/DIRECTION    37/270    DATE  09/17
HIGHEST GUST SPEED/DIRECTION    48/280    DATE  09/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              5     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       5
LIGHT RAIN                8     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      0
HAZE                      6

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

&&
RECORDS ESTABLISHED DURING SEPTEMBER 2015:

DAILY
* RECORD DAILY RAINFALL ON SEPTEMBER 18 OF 2.41 INCHES.
  PREVIOUS RECORD WAS 1.50 INCHES SET IN 1907.

$$




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.