233
CXUS53 KIWX 010923
CLMSBN
CLIMATE REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
523 AM EDT WED OCT 01 2025
...............................
..THE SOUTH BEND CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1893 TO 2025
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 88 09/19 MM MM 92 09/21
LOWEST 40 09/08 MM MM 43 09/08
AVG. MAXIMUM 78.3 74.4 3.9 80.1
AVG. MINIMUM 54.7 53.0 1.7 56.1
MEAN 66.5 63.7 2.8
DAYS MAX >= 90 0 1.5 -1.5 3
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 1.34 3.49 -2.15 3.47
DAILY AVG. 0.04 0.12 -0.08 0.12
DAYS >= .01 6 9.6 -3.6 6
DAYS >= .10 4 5.9 -1.9 4
DAYS >= .50 1 2.2 -1.2 2
DAYS >= 1.00 0 0.8 -0.8 2
GREATEST
24 HR. TOTAL 0.61 09/20 TO 09/21
SNOWFALL (INCHES)
RECORDS
TOTAL 1.2 1942
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 0.0
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 0 0.0 0.0 0
GREATEST
SNOW DEPTH 0
24 HR TOTAL MM
DEGREE DAYS
HEATING TOTAL 46 116 -70 27
SINCE 7/1 71 137 -66 35
COOLING TOTAL 100 77 23 125
SINCE 1/1 950 714 236 939
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WIND (MPH)
AVERAGE WIND SPEED 5.0
HIGHEST WIND SPEED/DIRECTION 25/270 DATE 09/05
HIGHEST GUST SPEED/DIRECTION 37/280 DATE 09/05
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.20
NUMBER OF DAYS FAIR 21
NUMBER OF DAYS PC 8
NUMBER OF DAYS CLOUDY 1
AVERAGE RH (PERCENT) 69
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 3 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 4
LIGHT RAIN 8 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 16 FOG W/VIS <= 1/4 MILE 1
HAZE 1
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
NEAR-RECORD COLD START GIVES WAY TO UNSEASONABLE WARMTH AND
DROUGHT.
A COLD FRONT AND SUBSEQUENT HIGH PRESSURE IN LATE AUGUST BROUGHT A
STRETCH OF BELOW NORMAL TEMPERATURES THAT SPILLED INTO SEPTEMBER. A
REINFORCING DOSE OF COLD AIR ARRIVED FOR SEPTEMBER 4TH, WHEN THE
OBSERVED DAILY AVERAGE TEMPERATURE OF 58 WAS 10 DEGREES BELOW
NORMAL. THE FIRST 10 DAYS OF THE MONTH WAS THE 4TH COLDEST ON RECORD
WITH AN AVERAGE TEMPERATURE OF 60.7 DEGREES. TWO RECORD LOWS WERE
TIED: 40 DEGREES ON THE 8TH (1986, 1951, 1932) AND 43 DEGREES ON THE
9TH (1914, 1951). BY MID-MONTH, STRONG UPPER-LEVEL RIDGING WAS
PROMINENT WHICH BROUGHT ANOMALOUS HEAT AND VERY LITTLE RAINFALL. IN
FACT, THE FINAL 20 DAYS OF THE MONTH RANKED AS THE 6TH WARMEST ON
RECORD WITH AN AVERAGE TEMPERATURE OF 69.4 DEGREES. RECORD LOW
TEMPERATURES WERE SET ON THE 8TH AND THE 9TH.
THE UNSEASONABLE WARMTH PAIRED WITH DRY CONDITIONS RESULTED IN A
RAPID DEGRADATION OF DROUGHT CONDITIONS THROUGH THE MONTH. ON
SEPTEMBER 2, THE US DROUGHT MONITOR INDICATED ABOUT 17% OF THE
NORTHERN INDIANA FORECAST AREA WAS EXPERIENCING MODERATE DROUGHT
(D1) OR WORSE. BY SEPTEMBER 23, THAT NUMBER WAS 71%. CREEK, POND,
AND STREAM LEVELS ARE EXPERIENCING VERY LOW FLOW. ADDITIONAL DROUGHT
IMPACTS INCLUDE TREES DROPPING LEAVES EARLY AND SOYBEANS ARE
STRESSED, FAILING TO FILL THEIR PODS IN SOME INSTANCES.
MEASURABLE RAINFALL OCCURRED ON ONLY SIX DAYS THIS MONTH, TOTALING
1.34 INCHES. THIS RANKS AS THE 18TH DRIEST ON RECORD, AND THE DRIEST
SINCE 0.48 INCHES IN 2009.
THE AVERAGE TEMPERATURE FOR THE MONTH WAS 66.5 DEGREES AND RANKS AS
THE 37TH WARMEST ON RECORD.
BROWN
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