Climatological Report (Monthly)
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000
CXUS53 KIWX 011009
CLMSBN

CLIMATE REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
604 AM EDT SUN OCT 1 2017

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

...THE SOUTH BEND CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1893 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              99   09/01/1953
                        09/08/1933
                        09/07/1933
 LOW               29   09/28/1942
HIGHEST            91   09/23        MM      MM       91  09/07
LOWEST             40   09/30        MM      MM       47  09/27
AVG. MAXIMUM     76.9              74.0     2.9     77.6
AVG. MINIMUM     54.5              53.7     0.8     58.2
MEAN             65.7              63.9     1.8
DAYS MAX >= 90      4               0.7     3.3        2
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        13.92   2008
 MINIMUM         0.01   1979
TOTALS           2.04              3.53   -1.49     3.74
DAILY AVG.       0.07              0.12   -0.05     0.12
DAYS >= .01         9               9.9    -0.9       10
DAYS >= .10         5               6.1    -1.1        7
DAYS >= .50         2               2.3    -0.3        2
DAYS >= 1.00        0               0.6    -0.6        2
GREATEST
 24 HR. TOTAL    0.84   09/19 TO 09/19

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.2   1942
TOTALS            0.0                 T     0.0      0.0
SINCE 7/1         0.0                 T     0.0      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0   09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL      91               116     -25       30
 SINCE 7/1        112               134     -22       38
COOLING TOTAL     118                82      36      123
 SINCE 1/1        670               764     -94      932
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.9
HIGHEST WIND SPEED/DIRECTION    25/320    DATE  09/04
HIGHEST GUST SPEED/DIRECTION    32/330    DATE  09/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           21
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       5
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      14     FOG W/VIS <= 1/4 MILE      2
HAZE                      0

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

&&

...WARM AND DRY SEPTEMBER DESPITE COOL START...

SEPTEMBER WAS A WARM AND DRY MONTH WHICH EXPERIENCED MORE 90 DEGREE
DAYS (4) THAN THE COMBINED MONTHS OF MAY, JUNE, JULY AND AUGUST (3).
NEARLY THREE QUARTERS OF THE MONTHLY PRECIPITATION FELL ON JUST TWO
DAYS AND THERE WERE ONLY 9 DAYS WITH MEASURABLE PRECIPITATION. THE
FIRST HALF OF THE MONTH ACTUALLY BEGAN RATHER COOL AND WET BUT
QUICKLY TRANSITIONED TO VERY WARM AND DRY DURING THE SECOND HALF.

TWELVE OF THE FIRST FOURTEEN DAYS OF SEPTEMBER SAW BELOW NORMAL
TEMPERATURES. FOUR OF THESE TWELVE DAYS WERE 10 DEGREES OR MORE
BELOW NORMAL. MEASURABLE PRECIPITATION ALSO FELL ON 6 OF THE FIRST 8
DAYS IN SEPTEMBER. THE OVERALL WEATHER PATTERN ACROSS THE UNITED
STATES CHANGED DRASTICALLY MID MONTH AND THIS BROUGHT HEAT, HUMIDITY
AND VERY DRY CONDITIONS TO THE LOCAL AREA DURING THE LATTER HALF OF
THE MONTH. THERE WAS ONLY ONE DAY AFTER THE 13TH WITH AN AVERAGE
TEMPERATURE BELOW NORMAL AND THAT WAS ON THE 30TH.

THE PERIOD FROM SEPTEMBER 20TH TO THE 26TH WAS EXCEPTIONALLY WARM
WITH EACH DAY DURING THIS PERIOD AT LEAST 11 DEGREES ABOVE NORMAL
AND FOUR DAYS FROM THE 21ST TO THE 24TH HAD HIGH TEMPERATURES OF 90
DEGREES OR WARMER. INCREASED CLOUDS AND HUMIDITY KEPT HIGH
TEMPERATURES ON THE 25TH AND 26TH AT 89 DEGREES.

SO JUST HOW WARM WAS THIS PERIOD FROM THE 20TH TO THE 26TH COMPARED
TO PREVIOUS YEARS? THE AVERAGE TEMPERATURE DURING THIS STRETCH WAS
76.4 DEGREES WITH 4 DAYS HAVING A HIGH TEMPERATURE OF 90 OR HIGHER.
ONLY THE YEAR 1908 HAD A WARMER AVERAGE TEMPERATURE, 77.1, DURING
THIS SAME PERIOD WHILE ALSO RECORDING 5 DAYS WITH HIGH TEMPERATURES
OF 90 OR WARMER DURING THIS STRETCH. SEPTEMBER 1908 IS ALSO THE
WARMEST SEPTEMBER ON RECORD AND HAD A TOTAL OF 13 DAYS WITH A HIGH
TEMPERTURE OF 90 OR WARMER AND 5 DAYS WITH A HIGH OF 95 DEGREES.

THE AVERAGE MONTHLY TEMPERATURE FOR SEPTEMBER 2017 WAS 65.7, 1.8
DEGREES ABOVE NORMAL. THIS RANKED AS THE 37TH WARMEST SEPTEMBER ON
RECORD. THE HIGHEST TEMPERATURE WAS 91 ON THE 23RD AND THE COOLEST
TEMPERATURE WAS 40 ON THE 30TH.

THERE WAS JUST 2.04 INCHES OF PRECIPITATION RECORDED, 1.49 INCHES
BELOW NORMAL. THIS RANKED AS THE 35TH DRIEST SEPTEMBER ON RECORD.

$$
LASHLEY



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