Climatological Report (Seasonal)
Issued by NWS

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CXUS53 KIWX 011558
CLSSBN

CLIMATE REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
1055 AM EST THU MAR 1 2018

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

...THE SOUTH BEND CLIMATE SUMMARY FOR THE WINTER SEASON, FROM
12/1/2017 TO 2/28/2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1893 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              74   02/25/2000
 LOW              -22   01/20/1943
                        01/25/1897
HIGHEST            64   02/20        MM      MM       66
LOWEST            -15   01/02        MM      MM      -14
AVG. MAXIMUM     33.6              33.8    -0.2     38.0
AVG. MINIMUM     18.1              20.1    -2.0     23.6
MEAN             25.9              27.0    -1.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     42              39.1     2.9       29
DAYS MIN <= 32     76              77.6    -1.6       67
DAYS MIN <= 0      12               5.3     6.7        5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        13.35   1950
 MINIMUM         2.77   1945
TOTALS          11.37              6.85    4.52     8.98
DAILY AVG.       0.13              0.08    0.05     0.10
DAYS >= .01        56              43.3    12.7       45
DAYS >= .10        22              18.4     3.6       21
DAYS >= .50         4               3.0     1.0        5
DAYS >= 1.00        2               0.8     1.2        2
GREATEST
 24 HR. TOTAL    3.73

SNOWFALL (INCHES)
RECORDS
 TOTAL          136.3   1978
 24 HR TOTAL       MM
TOTALS           84.0              52.9    31.1     33.2
SINCE 7/1        84.0              58.1    25.9     33.7
SNOWDEPTH AVG.      3                 3       0        1
DAYS >= TRACE      47              33.3    13.7       44
DAYS >= 1.0        26              16.0    10.0       11
GREATEST
 SNOW DEPTH        15   02/11                          8
                        02/10
 24 HR TOTAL     10.3   MM

DEGREE_DAYS
HEATING TOTAL    3510              3420      90     3076
 SINCE 7/1         MM              4689      MM       MM
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              10.5
HIGHEST WIND SPEED/DIRECTION    35/260    DATE  02/25
HIGHEST GUST SPEED/DIRECTION    46/180    DATE  12/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR           18
NUMBER OF DAYS PC             22
NUMBER OF DAYS CLOUDY         50

AVERAGE RH (PERCENT)     79

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       6
LIGHT RAIN               18     FREEZING RAIN              1
LT FREEZING RAIN          5     HAIL                       0
HEAVY SNOW                5     SNOW                      20
LIGHT SNOW               45     SLEET                      0
FOG                      68     FOG W/VIS <= 1/4 MILE     15
HAZE                     33

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

&&

WINTER 2017-18

THE WINTER OF 2017-18 WAS CHARACTERIZED BY ALTERNATING STRETCHES
BETWEEN VERY COLD AND WARM WEATHER. EACH PERIOD LASTED BETWEEN ONE
AND THREE WEEKS BEFORE THE PATTERN QUICKLY CHANGED. DURING THE COLD
PERIODS, ABOVE NORMAL SNOWFALL AND BELOW NORMAL TEMPERATURES WERE
OBSERVED. DURING THE WARM PERIODS, TEMPERATURES WERE ABOVE NORMAL
WHILE PRECIPITATION WAS GENERALLY NEAR OR BELOW NORMAL. THE LATTER
WOULD CHANGE DURING THE LAST WARM SPELL OF THE SEASON OVER THE LAST
TWO WEEKS IN FEBRUARY. DURING THIS WARM PERIOD, UNPRECEDENTED RECORD
HEAVY RAINFALL OCCURRED OVER NORTHERN INDIANA AND LOWER MICHIGAN. SO
MUCH RAIN FELL IN A 3 DAY PERIOD THAT THE SEASONAL TOTAL
PRECIPITATION JUMPED TO 3RD HIGHEST ALL-TIME AT SOUTH BEND.

THE WINTER BEGAN VERY MILD WITH THE FIRST 5 DAYS OF DECEMBER HAVING
HIGH TEMPERATURES IN THE 50S AND 60S. THIS QUICKLY ENDED WHILE ALSO
BEGINNING THE FIRST PATTERN SHIFT OF THE SEASON TO MUCH BELOW NORMAL
TEMPERATURES AND ABOVE NORMAL SNOWFALL. DECEMBER SAW TWO STRETCHES
OF ABOVE NORMAL TEMPERATURES AND TWO PERIODS OF BELOW NORMAL
TEMPERATURES. OVERALL THE MONTH ENDED JUST OVER 3 DEGREES BELOW
NORMAL FOR ITS AVERAGE TEMPERATURE, JUST OVER AN INCH BELOW NORMAL
FOR PRECIPITATION BUT JUST OVER 15 INCHES ABOVE NORMAL FOR SNOWFALL.

JANUARY SAW THE ALTERNATING WARM AND COLD PATTERN CONTINUE AS THE
MONTH BEGAN WITH ONE OF THE COLDEST BEGINNINGS TO A NEW YEAR ON
RECORD AS TEMPERATURES DROPPED WELL BELOW ZERO. THE SECOND WEEK WAS
MILD BUT FOLLOWED QUICKLY BY ANOTHER VERY COLD PERIOD LASTING
THROUGH ABOUT THE 18TH. THIS WAS AGAIN FOLLOWED BY VERY MILD AIR
WITH ABOVE NORMAL TEMPERATURES THAT LASTED THROUGH THE END OF THE
MONTH. THE AVERAGE MONTHLY TEMPERATURE WAS NEAR NORMAL WHILE
PRECIPITATION WAS JUST BELOW NORMAL BUT SNOWFALL WAS SLIGHTLY ABOVE
NORMAL.

FEBRUARY WAS NOT ABOUT TO BUCKLE THE TREND OF THE SEASON UNTIL A
THREE DAY STRETCH MID MONTH THAT ALTERED THE SEASONAL TOTALS OF
PRECIPITATION AND RE-WROTE THE RECORD BOOKS FOR MONTHLY
PRECIPITATION. FEBRUARY WAS SPLIT IN HALF WITH THE BEGINNING HALF
SEEING TEMPERATURES BELOW NORMAL WHILE THE SECOND HALF WAS ABOVE
NORMAL. SNOWFALL WAS WELL ABOVE NORMAL DURING THE FIRST PORTION OF
THE MONTH THANKS TO MORE THAN A FOOT OF SNOW WITH ONE STORM SYSTEM.
THE LATTER HALF OF THE MONTH SAW RECORD PRECIPITATION AND MILD
TEMPERATURES. OVERALL THE AVERAGE MONTHLY TEMPERATURE WAS JUST
SLIGHTLY ABOVE NORMAL WHILE PRECIPITATION CRUSHED THE MONTHLY RECORD
AND BROUGHT THE SEASONAL TOTAL TO 3RD HIGHEST ALL TIME. SNOWFALL WAS
WELL ABOVE NORMAL AND DESPITE THE ALTERNATING WARM AND COLD PERIODS,
THIS WINTER SEASON SAW SNOWFALL TOTALS WELL ABOVE NORMAL.

THE 2017-18 WINTER SEASON AT SOUTH BEND HAD AN AVERAGE TEMPERATURE
OF 25.9 DEGREES, WHICH WAS 1.1 DEGREES BELOW NORMAL. THIS RANKED AS
THE 42ND COLDEST WINTER ON RECORD.

PRECIPITATION FOR THE SEASON WAS 11.37 INCHES, 4.52 INCHES ABOVE
NORMAL. THIS RANKED AS THE 3RD WETTEST WINTER ON RECORD. OVER 8
INCHES OF THIS PRECIPITATION FELL IN FEBRUARY AND OVER 5 INCHES FELL
IN JUST A 3 DAY PERIOD DURING MID FEBRUARY.

SNOWFALL FOR THE SEASON WAS 84.0 INCHES, 31.1 INCHES ABOVE NORMAL.
THIS RANKED AS THE 7TH SNOWIEST WINTER SEASON ON RECORD.

BELOW IS A MONTH BY MONTH SUMMARY OF THE WINTER SEASON IN THE SOUTH
BEND AREA.

DECEMBER...

AFTER A BRUTALLY COLD AND SNOWY STRETCH OF WEATHER TO END DECEMBER,
IT IS HARD TO REMEMBER THAT THE MONTH BEGAN WITH NEAR RECORD WARMTH
AND TEMPERATURES IN THE 50S AND 60S. THOSE WARM TEMPERATURES LASTED
ABOUT 5 DAYS BEFORE A 10 DAY STRETCH OF BELOW NORMAL TEMPERATURES
FOLLOWED BY ANOTHER PERIOD OF 8 DAYS ABOVE NORMAL. THAT WOULD BE THE
END TO ANY WARMTH THOUGH AS BITTERLY COLD AIR STRAIGHT OUT OF
SIBERIA FLUSHED INTO THE CENTRAL AND EASTERN UNITED STATES FOR THE
LAST 8 DAYS OF DECEMBER. TEMPERATURES WERE MORE THAN 20 DEGREES
BELOW NORMAL DURING THIS PERIOD WITH MEASURABLE SNOWFALL ON EVERY
DAY.

A FEW DAILY TEMPERATURE RECORDS WERE SET OR TIED DURING THE COLD END
TO THE MONTH. A RECORD COLD MAXIMUM TEMPERATURE OF 8 DEGREES WAS
RECORDED ON THE 26TH. THIS BROKE THE PREVIOUS RECORD OF 10 SET IN
1925.  THIS HIGH OF 8 DEGREES WAS ALSO THE 9TH COLDEST HIGH
TEMPERATURE EVER RECORDED IN DECEMBER. A RECORD COLD MAXIMUM
TEMPERATURE OF 12 DEGREES WAS ALSO RECORDED ON THE 31ST. THIS TIED
THE PREVIOUS RECORD SET IN 1899. THE MONTH ENDED WITH 6 STRAIGHT
DAYS HAVING HIGH TEMPERATURES LESS THAN 20 DEGREES. THIS WAS THE
SECOND LONGEST SUCH STREAK AT SOUTH BEND, SHY OF THE RECORD BY JUST
1 DAY. THE RECORD OF 7 CONSECUTIVE DECEMBER DAYS WITH HIGH
TEMPERATURES BELOW 20 DEGREES WAS SET IN 1901, 1917 AND 1958.

THE AVERAGE MONTHLY TEMPERATURE WAS 25.5, 3.3 DEGREES BELOW NORMAL.
THIS RANKED AS THE 31ST COLDEST DECEMBER ON RECORD. THE WARMEST
TEMPERATURE WAS 61 ON THE 4TH AND THE COLDEST WAS 6 BELOW ON THE
28TH. THE PERIOD OF DECEMBER 26TH TO DECEMBER 31ST HAD AN AVERAGE
TEMPERATURE OF 5.8 DEGREES WHICH WAS THE COLDEST EVER RECORDED
DURING THIS 6 DAY STRETCH.

PRECIPITATION FOR THE MONTH WAS 1.36 INCHES, 1.25 INCHES BELOW
NORMAL. THIS WAS THE 18TH DRIEST DECEMBER ON RECORD, YET MEASURABLE
PRECIPITATION FELL ON 18 DAYS. DESPITE HAVING WELL BELOW NORMAL
PRECIPITATION, SNOWFALL FOR THE MONTH WAS WELL ABOVE NORMAL. A TOTAL
OF 32.4 INCHES WAS RECORDED WHICH WAS 15.1 INCHES ABOVE NORMAL. THIS
RANKED AS THE 8TH SNOWIEST DECEMBER ON RECORD. THE DISPARITY BETWEEN
PRECIPITATION AND SNOWFALL WAS DUE TO THE VERY COLD TEMPERATURES AT
THE END OF THE MONTH. THIS CREATED VERY LARGE LIQUID TO SNOW RATIOS
WHICH LED TO VERY EFFICIENT SNOW MAKING PROCESSES.

JANUARY

JANUARY WAS A MONTH OF EXTREMES AND FLUCTUATIONS IN THE WEATHER AS
VERY COLD AND WARM TEMPERATURES WERE EXPERIENCED AT TIMES. THE MONTH
BEGAN WITH BITTERLY COLD ARCTIC AIR AND SUB ZERO TEMPERATURES ACROSS
THE REGION MAKING FOR ONE OF THE COLDEST NEW YEAR DAYS IN HISTORY.
THE COLD AIR SUBSIDED BRIEFLY BUT CAME BACK WITH MORE SUB ZERO AIR
DURING THE SECOND AND THIRD WEEKS OF THE MONTH.

THE DIFFERENCE BETWEEN THE WARMEST AND COLDEST TEMPERATURES WAS A
WHOPPING 73 DEGREES AND SEPARATED BY JUST 8 DAYS. THE LOWEST
TEMPERATURE OF THE MONTH WAS 15 DEGREES BELOW ZERO ON THE 2ND AND
THE WARMEST TEMPERATURE WAS 58 DEGREES ON THE 11TH. BOTH OF THESE
TEMPERATURES WERE DAILY RECORDS ON THEIR RESPECTIVE DATES.

DESPITE THE OVERALL FEELING THAT JANUARY WAS COLD, THERE WERE
ACTUALLY MORE DAYS WITH ABOVE NORMAL TEMPERATURES THAN BELOW NORMAL.
HOWEVER, MOST BELOW NORMAL DAYS WERE WELL BELOW NORMAL AND AS MUCH
AS 20 TO 30 DEGREES BELOW NORMAL. THIS WAS DUE TO BITTERLY COLD
ARCTIC AIR THAT INTRUDED DURING TWO SEPARATE PERIODS DURING THE
FIRST HALF OF THE MONTH.  THE PERIOD FROM JANUARY 19TH THROUGH THE
31ST DID NOT HAVE A DAY WITH A BELOW NORMAL AVERAGE TEMPERATURE.
THIS MILD END TO THE MONTH HELPED EVEN OUT THE COLD STRETCHES AND
LED TO A NEAR NORMAL AVERAGE MONTHLY TEMPERATURE.

THE AVERAGE MONTHLY TEMPERATURE WAS 23.7 DEGREES, 0.7 DEGREES BELOW
NORMAL. THIS RANKED AS JUST THE 46TH COLDEST JANUARY ON RECORD AND
TIED WITH 1903 AND 1917. THERE WERE 5 DAYS WITH TEMPERATURES BELOW
ZERO.

PRECIPITATION FOR THE MONTH WAS 1.93 INCHES WHICH WAS 0.36 INCHES
BELOW NORMAL. THIS RANKED AS THE 56TH DRIEST JANUARY ON RECORD.

DESPITE BELOW NORMAL PRECIPITATION, SNOWFALL WAS SLIGHTLY ABOVE
NORMAL. A TOTAL OF 22.0 INCHES FELL WHICH WAS 1.4 INCHES ABOVE
NORMAL. THIS RANKED AS THE 37TH SNOWIEST JANUARY ON RECORD.

FEBRUARY

...HISTORIC FEBRUARY PRECIPITATION AND FLOODING...

AN INCREDIBLE AND UNPRECEDENTED RAINFALL EVENT DURING THE THIRD WEEK
OF FEBRUARY LED TO CATASTROPHIC RECORD FLOODING IN THE SOUTH BEND
AREA. OVER 8 INCHES OF PRECIPITATION FELL DURING THE MONTH. THIS WAS
AN ALL-TIME RECORD FOR FEBRUARY AND SMASHED THE PREVIOUS RECORD OF
5.23 INCHES WHICH OCCURRED IN 1976. ABOUT 70 PERCENT OF THIS MONTHLY
PRECIPITATION OCCURRED AS RAINFALL OVER JUST 3 DAYS, THE 19TH, 20TH
AND 21ST. A TOTAL OF 3.73 INCHES FELL ON THE 20TH AND THIS WAS A
RECORD AMOUNT FOR THE DAY AS WELL AS THE ALL-TIME SINGLE DAY
PRECIPITATION RECORD FOR FEBRUARY. TO PUT THIS AMOUNT INTO
PERSPECTIVE, THE PREVIOUS SINGLE DAY FEBRUARY PRECIPITATION RECORD
WAS 1.95 INCHES SET ON FEBRUARY 1ST, 1968. THE 3.73 INCHES WAS ALSO
A SINGLE DAY RECORD FOR THE ENTIRE WINTER SEASON, WHICH RUNS FROM
DECEMBER THROUGH FEBRUARY, AS WELL AS ANY SINGLE DAY BETWEEN THE
MONTHS OF DECEMBER AND MAY.

THIS RECORD RAINFALL OCCURRED JUST 10 DAYS AFTER A LARGE SNOWSTORM
DROPPED MORE THAN A FOOT OF SNOW ACROSS NORTHERN INDIANA AND
SOUTHWEST LOWER MICHIGAN, WITH A SINGLE DAY RECORD OF 10.3 INCHES
FALLING ON FEBRUARY 9TH. THE FIRST 10 OUT OF 11 DAYS IN FEBRUARY
ACTUALLY SAW MEASURABLE SNOWFALL IN SOUTH BEND WITH A MAXIMUM SNOW
DEPTH OF 15 INCHES REPORTED ON THE 10TH AND 11TH. AN ESTIMATED 1.5
TO 1.75 INCHES OF LIQUID WAS CONTAINED WITHIN THIS SNOWPACK WHEN THE
RECORD RAINFALL OCCURRED. RUNOFF FROM THIS SNOWMELT AND RECORD
RAINFALL LED TO RAPID RISES ON AREA STREAMS, CREEKS AND RIVERS,
EVENTUALLY LEADING TO RECORD CRESTS ON MAIN RIVERS AND EXTENSIVE,
CATASTROPHIC FLOODING OVER NORTHERN INDIANA AND LOWER MICHIGAN.
SEVERAL RIVER FORECAST POINTS WITHIN THE ST. JOSEPH, KANKAKEE, AND
TIPPECANOE RIVER BASINS EXPERIENCED RECORD CRESTS AND FLOWS.

TEMPERATURE WISE IT WAS A NEAR NORMAL MONTH WITH AN AVERAGE
TEMPERATURE OF 28.4 DEGREES, JUST 0.6 DEGREES ABOVE NORMAL. THIS
RANKED AS THE 45TH WARMEST FEBRUARY ON RECORD. THE WARMEST
TEMPERATURE WAS 64 ON THE 20TH AND THE COLDEST TEMPERATURE WAS 5
BELOW ZERO ON THE 5TH. THE TEMPERATURE ALSO FELL BELOW ZERO ON THE
12TH TO 1 BELOW ZERO. THE MONTH WAS NEARLY EVENLY SPLIT BETWEEN A
COLD FIRST HALF AND A WARM SECOND HALF LEADING TO THE SLIGHTLY ABOVE
NORMAL MONTHLY AVERAGE TEMPERATURE.

THE RECORD TOTAL MONTHLY PRECIPITATION OF 8.08 INCHES WAS AN
INCREDIBLE 6.13 INCHES ABOVE NORMAL FOR FEBRUARY. THE PREVIOUS
MONTHLY RECORD WAS 5.23 INCHES SET IN 1976. THIS MONTHLY
PRECIPITATION AMOUNT WAS ACTUALLY MORE THAN 4 INCHES ABOVE ANY
MONTHLY NORMAL PRECIPITATION VALUE ACROSS THE ENTIRE YEAR. JULY IS
TYPICALLY THE WETTEST MONTH OF THE YEAR WITH NORMAL PRECIPITATION OF
4 INCHES.

FEBRUARY SNOWFALL WAS 29.6 INCHES, 14.6 INCHES ABOVE NORMAL. ALL OF
THIS SNOWFALL OCCURRED IN THE FIRST 17 DAYS OF THE MONTH WITH NO
MEASURABLE SNOWFALL AFTER FEBRUARY 17TH. THIS ALSO RANKED AS THE 7TH
SNOWIEST FEBRUARY ON RECORD.

$$

LASHLEY



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