Climatological Report (Monthly)
Issued by NWS Marquette, MI

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856
CXUS53 KMQT 181532 AAA
CLMMQT

CLIMATE REPORT...PRELIMINARY
NATIONAL WEATHER SERVICE MARQUETTE MI
1130 AM EDT FRI SEP 18 2015

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

...THE MARQUETTE MI CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1961 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              96   08/06/2001
 LOW               31   08/30/1976
HIGHEST            90   08/16        73      17       83  08/25
                                                          08/09
LOWEST             39   08/27        52     -13       42  08/28
AVG. MAXIMUM     73.7              74.3    -0.6     71.3
AVG. MINIMUM     54.3              53.1     1.2     52.0
MEAN             64.0              63.7     0.3     61.7
DAYS MAX >= 90      1               0.5     0.5        0
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         8.59   1988
 MINIMUM         0.44   2008
TOTALS           2.70              3.05   -0.35     4.47
DAILY AVG.       0.09              0.10   -0.01     0.14
DAYS >= .01        11              10.7     0.3       12
DAYS >= .10         9               6.1     2.9       10
DAYS >= .50         1               1.9    -0.9        1
DAYS >= 1.00        0               0.7    -0.7        1
GREATEST
 24 HR. TOTAL    0.73   08/09 TO 08/10

SNOWFALL (INCHES)
RECORDS
 TOTAL              T   2009
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0        T
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   08/31 TO 08/31

DEGREE_DAYS
HEATING TOTAL     100               106      -6      126
 SINCE 7/1        168               185     -17      247
COOLING TOTAL      74                66       8       31
 SINCE 1/1        182               220     -38      147
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              MM
HIGHEST WIND SPEED/DIRECTION    MM        DATE   MM
HIGHEST GUST SPEED/DIRECTION    33/225    DATE  08/22

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

AVERAGE RH (PERCENT)     MM

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       3
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      0

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

&&

...AUGUST 2015 MONTHLY CLIMATE SUMMARY FOR UPPER MICHIGAN...
/THIS DISCUSSION DOES NOT INCLUDE CHIPPEWA AND MACKINAC COUNTIES/

...GENERALLY DRY OVER THE NORTH AND WETTER ACROSS THE SOUTH...

...MONTHLY MEAN TEMPERATURE NOT FAR FROM NORMAL...

AUGUST CLIMATE STATISTICS FOR THE MARQUETTE NWS IN NEGAUNEE TOWNSHIP

                                    NORMAL   DEPARTURE
AVERAGE TEMPERATURE         64.0     63.7   PLUS    0.3
AVERAGE HIGH TEMPERATURE    73.7     74.3  MINUS    0.6
AVERAGE LOW TEMPERATURE     54.3     53.1   PLUS    1.2
HEATING DEGREE DAYS          100      106  MINUS      6
COOLING DEGREE DAYS           74       66   PLUS      8
TOTAL PRECIPITATION         2.70     3.05  MINUS   0.35
TOTAL SNOWFALL                 0        0             0

HIGHEST TEMPERATURE:                    90 ON 8/16
LOWEST TEMPERATURE:                     39 ON 8/27
GREATEST CALENDAR DAY PRECIPITATION:  0.71 ON 8/9
GREATEST 24 HOUR PRECIPITATION:       0.73 ON 8/9-8/10
GREATEST CALENDAR DAY SNOWFALL:          0
PEAK WIND SPEED: 33 MPH FROM THE SOUTHWEST ON 8/22

DAILY RECORD HIGH MINIMUM TEMPERATURE ON 8/16...69 /OLD RECORD
                                                        67...1987/
DAILY RECORD HIGH MAXIMUM TEMPERATURE ON 8/16...90 /89...1983/
DAILY RECORD LOW MAXIMUM TEMPERATURE ON 8/24...54 /56...1971&78/
DAILY RECORD LOW MAXIMUM TEMPERATURE ON 8/25...53 /57...1971&92/
---------------------------------------------------------------------
GREAT LAKES WATER LEVELS (FEET/METERS ABOVE MEAN SEA LEVEL)

                            LAKE SUPERIOR  LAKE MICHIGAN-HURON
08/01/15 DAILY MEAN         602.64/183.69     579.81/176.73
08/31/15 DAILY MEAN         602.65/183.69     579.75/176.71
AVG JUL 2015 DAILY MEAN     602.64/183.68     579.81/176.73
AVG AUG 2014 DAILY MEAN     602.59/183.67     578.99/176.48
LONG TERM AUG DAILY MEAN    602.13/183.53     579.23/176.55
MAXIMUM AUG DAILY MEAN      603.22/183.86     581.99/177.39
                                (1952)           (1986)
MINIMUM AUG DAILY MEAN      600.43/183.01     576.67/175.77
                                (2007)           (1964)

...GREAT LAKES WATER LEVELS REMAIN WELL ABOVE NORMAL IN AUGUST...

WATER LEVELS ON THE WESTERN GREAT LAKES REMAINED NEARLY STEADY IN
AUGUST AS LIMITED EVAPORATION CAUSED BY RELATIVELY CHILLY WATER
TEMPERATURES OFFSET GENERALLY BELOW NORMAL RAINFALL AND RUNOFF IN
THE LAKES DRAINAGE BASINS. AT THE END OF AUGUST...WATER LEVELS ON
LAKE SUPERIOR WERE 6 TO 7 INCHES ABOVE NORMAL AND NEARLY 1 INCH
HIGHER THAN THE AUGUST AVERAGE IN 2014. THE LEVEL ON LAKES MICHIGAN
AND HURON WAS 6 TO 7 INCHES ABOVE AVERAGE ON 8/31 AND 9 TO 10 INCHES
HIGHER THAN DURING AUGUST 2014.

OBTAIN GREAT LAKES WATER LEVEL DATA AS REPORTED BY THE U.S. ARMY
CORPS OF ENGINEERS AT

HTTP://WWW.LRE.USACE.ARMY.MIL/MISSIONS/GREATLAKESINFORMATION/
       GREATLAKESWATERLEVELS/CURRENTCONDITIONS.ASPX (ALL LOWER CASE).
---------------------------------------------------------------------
                        AUGUST CLIMATE HIGHLIGHTS

HIGHEST REPORTED TEMPERATURE...95 AT MUNISING ON 8/16

LOWEST REPORTED TEMPERATURE...32 NEAR COVINGTON IN BARAGA COUNTY
                               ON 8/27

HIGHEST AVERAGE TEMPERATURE...66.4 DEGREES AT HARVEY IN MARQUETTE
                               COUNTY

LOWEST AVERAGE TEMPERATURE...61.7 DEGREES AT CLARKSBURG IN
                              MARQUETTE COUNTY

HIGHEST MONTHLY PRECIPITATION...5.45 INCHES AT AMASA IN IRON COUNTY

LOWEST MONTHLY PRECIPITATION...1.67 INCHES AT BARAGA

AUGUST 2015 FEATURED A CHANGEABLE WEATHER PATTERN...WITH SOME
PERIODS OF VERY WARM AND COOL WEATHER. SINCE THE POSITIVE AND
NEGATIVE TEMPERATURE ANOMALIES DURING THE MORE EXTREME PERIODS
TENDED TO BALANCE OUT...THE MEAN AUGUST TEMPERATURE ENDED UP WITHIN
A DEGREE OF NORMAL AT MOST PLACES. THESE AVERAGE MONTHLY
TEMPERATURES RANGING BETWEEN ABOUT 62 AND 66 DEGREES RAN ABOUT 1 TO
2 DEGREES LOWER THAN THE JULY AVERAGES AT MOST PLACES.

THE COOLEST PERIODS IN AUGUST WERE DURING THE FIRST AND ESPECIALLY
THE FOURTH WEEKS. THE COOL NORTHWEST FLOW AROUND A DEEP LOW PRESSURE
SYSTEM MORE TYPICAL OF FALL AND WHICH MOVED OVER ONTARIO ADVECTED
CANADIAN AIR INTO THE UPPER LAKES ON 8/23 INTO 8/27. MEAN DAILY
TEMPERATURES DURING THIS PERIOD FELL AS LOW AS 10 TO 15 DEGREES
BELOW NORMAL. SINCE THERE WERE PLENTY OF CLOUDS...THE DAYTIME HIGH
TEMPERATURE ANOMALIES WERE MOST EXTREME. HIGH TEMPERATURES IN THE
50S WERE COMMON ON 8/24 AND 8/25...AND ALSO OCCURRED ON 8/26 AT A
FEW PLACES OVER THE EAST. THESE HIGH TEMPERATURES ARE AS MUCH AS 20
TO 25 DEGREES BELOW NORMAL AND SET NEW DAILY RECORD LOW MAXIMUMS AT
A NUMBER OF LOCATIONS. AS THE CANADIAN HIGH PRESSURE MOVED OVERHEAD
EARLY ON 8/27...MANY INLAND PLACES SAW THE MERCURY SINK INTO THE
CHILLY 30S...INCLUDING THE MONTHLY LOW OF 32 NEAR COVINGTON IN
BARAGA COUNTY. THE COOL SHOT OF CANADIAN AIR THAT DOMINATED FROM 8/3
TO 8/7 DROPPED MEAN DAILY TEMPERATURES AS MUCH AS 10 DEGREES BELOW
AVERAGE ON 8/4. SOME OF THE COOLER INLAND LOCATIONS REPORTED A LOW
TEMPERATURE IN THE 30S AT DAYBREAK ON 8/5.

THE WARMEST TIME IN AUGUST WAS AROUND MID MONTH...WHEN AN UPPER
RIDGE OVER THE PLAINS EXPANDED EAST INTO THE GREAT LAKES. MEAN DAILY
TEMPERATURES ON 8/13 THROUGH 8/16 AVERAGED 10 TO 15 DEGREES ABOVE
NORMAL. THE MERCURY REACHED 90 OR HIGHER AT AT LEAST A COUPLE
LOCATIONS ON 8/14...8/15 AND 8/16. THE AFTERNOON ON 8/16 WAS WARMEST
AND FEATURED THE MONTHLY HIGHEST TEMPERATURE OF 95 REPORTED NEAR
MUNISING. THE LAST COUPLE DAYS OF AUGUST ALSO TURNED VERY WARM AS AN
UPPER RIDGE BUILT BACK INTO THE GREAT LAKES FOLLOWING THE RETREAT OF
THE DEEP TROUGH RESPONSIBLE FOR THE VERY COOL PERIOD AROUND 8/25. A
FEW SPOTS SAW THE THERMOMETER REACH 90 IN THE AFTERNOON ON 8/31...
WHEN THE MEAN DAILY TEMPERATURE ROSE TO 10 DEGREES ABOVE NORMAL.

AUGUST WAS A GENERALLY DRY MONTH ACROSS THE NORTHEAST HALF OF UPPER
MICHIGAN BUT WETTER TOWARD THE WISCONSIN BORDER...AN AREA WHICH WAS
IMPACTED MORE FREQUENTLY BY THE TYPICALLY VARIABLE SUMMER-TIME
CONVECTION. MOST PLACES PICKED UP 2.00 TO 3.50 INCHES OF RAIN DURING
THE MONTH...ABOUT 75 TO 100 PERCENT OF THE AUGUST NORMAL. WITHIN THE
DRIER NORTHEAST HALF...BARAGA AND NEWBERRY REPORTED ONLY 1.67 AND
1.73 INCHES OF RAIN RESPECTIVELY...ABOUT 50 PERCENT OF NORMAL.
CLOSER TO THE WISCONSIN BORDER...AMASA IN IRON COUNTY WAS INUNDATED
WITH 5.45 INCHES OF RAIN.

A STRONG UPPER DISTURBANCE PASSING THROUGH THE UPPER GREAT LAKES
INTERACTED WITH AN UNSTABLE AIRMASS IN PLACE AND INITIATED AN
OUTBREAK OF SEVERE THUNDERSTORMS ON 8/2. THE STRONGEST STORMS
BOMBARDED SOME PLACES IN ALGER AND DELTA COUNTIES WITH HAIL AS LARGE
AS 1.5 INCHES IN DIAMETER. WIND GUSTS AS HIGH AS 63 MPH STRUCK THE
AREA AROUND MENOMINEE AND CAUSED SOME DAMAGE. ADDITIONAL
THUNDERSTORMS THAT FORMED ALONG A SLOW MOVING COLD FRONT DROPPED
HEAVY RAIN ON PORTIONS OF THE SOUTH CENTRAL ON 8/9. AMASA REPORTED
3.63 INCHES OF RAIN DURING THIS ONE EVENT...A LARGE PORTION OF THE
HIGH MONTHLY PRECIPITATION TOTAL THERE. A WEAK COLD FRONT DROPPING
INTO THE UPPER LAKES INITIATED SOME SEVERE THUNDERSTORMS OVER THE
SOUTH CENTRAL IN THE EVENING ON 8/14. HAIL AS LARGE AS GOLF BALLS
FELL AT A FEW SPOTS IN DELTA AND MENOMINEE COUNTIES DURING THIS
EVENT. A COLD FRONT CROSSING THE AREA DURING THE NIGHT ON 8/16-8/17
THAT ENDED THE MID-MONTH WARM SPELL CAUSED A SEVERE THUNDERSTORM
THAT DROPPED QUARTER-SIZED HAIL AT A FEW PLACES IN DELTA COUNTY.

A BAND OF SHOWERS AND THUNDERSTORMS AHEAD OF THE STRONG UPPER
DISTURBANCE AND ATTENDANT COLD FRONT AT THE LEADING EDGE OF THE
CHILLY CANADIAN AIRMASS RESPONSIBLE FOR THE COOL FOURTH WEEK DROPPED
SOME LOCALLY HEAVY RAIN IN EXCESS OF AN INCH AT A FEW SPOTS ON 8/23.
SOME OF THE STRONGER STORMS ALSO CAUSED WIND GUSTS UP TO 50 TO 55
MPH IN DELTA COUNTY. ADDITIONAL HEAVY RAIN IN EXCESS OF AN INCH FELL
OVER THE KEWEENAW ON 8/24 ASSOCIATED WITH THE DEEP LOW PRESSURE
SYSTEM THAT WAS MOVING INTO ONTARIO.
---------------------------------------------------------------------
                ...JUNE-AUGUST 2015 MEAN TEMPERATURE...

          ...SUMMER A BIT COOLER THAN NORMAL AT MOST PLACES...

               OBSERVED  NORMAL  DEPARTURE     RECORD      2015 RANK

MANISTIQUE       61.7     63.0     -1.3     57.8 /1992/  22ND COOLEST

MUNISING         60.8     62.8     -2.0     56.0 /1920/  23RD COOLEST

MARQUETTE CITY   62.9     64.4     -1.5     58.6 /1915/      ****

IRON MOUNTAIN    65.3     66.0     -0.7     61.8 /1927/      ****

MARQUETTE NWS    62.7     63.3     -0.6     57.9 /1992/      ****

NEWBERRY         63.1     63.6     -0.5     57.9 /1992/      ****

IRONWOOD         63.3     63.8     -0.5     58.2 /1992/      ****

HOUGHTON         62.8     62.7     +0.1     57.7 /1950/      ****

**** NOT IN TOP 25

ALTHOUGH MEAN MONTHLY TEMPERATURES IN JULY AND AUGUST WERE WITHIN A
DEGREE OF NORMAL AT MOST PLACES...JUNE WAS COOLER THAN NORMAL ACROSS
UPPER MICHIGAN. THIS CHILL WAS MOST PRONOUNCED OVER THE EAST HALF
NEAR THE GREAT LAKES BECAUSE EXTENSIVE WINTER ICE COVER LINGERED
OVER THE SURROUNDING LAKE WATERS LONGEST INTO SPRING...HOLDING DOWN
LAKE TEMPERATURES AND MODERATING THE SEASONAL WARMUP OVER THE LAND
AREAS NEAR THE SHORE. BECAUSE JUNE WAS COOLER AT MANISTIQUE AND
MUNISING...THE OVERALL SUMMER 2015 MEAN TEMPERATURE AT THOSE PLACES
ENDED UP WITHIN THE TOP 25 LOWEST ON RECORD. ALTHOUGH THE JUNE CHILL
RESULTED IN A COOLER THAN NORMAL SUMMER AT MOST OTHER LOCATIONS...
THE COOL WEATHER WAS NOT AS ANOMALOUS.

                ...JUNE-AUGUST 2015 PRECIPITATION...

            ...SUMMER DRIER THAN NORMAL AT MOST PLACES...

               OBSERVED  NORMAL  DEPARTURE     RECORD      2015 RANK

MANISTIQUE       5.68     8.86     -3.18    4.35 /1983/   6TH LOWEST

MARQUETTE NWS    6.89     8.73     -1.84    5.14 /2007/  12TH LOWEST

NEWBERRY         7.02     9.31     -2.29    3.50 /1905/  18TH LOWEST

MARQUETTE CITY   7.42     8.13     -0.71    3.53 /1892/      ****

HOUGHTON         7.03     7.48     -0.45    4.32 /2007/      ****

MUNISING         8.76     9.11     -0.35    4.08 /1919/      ****

IRONWOOD        10.87    11.13     -0.26    2.36 /1907/      ****

IRON MOUNTAIN   10.24    10.19     +0.05    4.27 /1937/      ****

**** NOT IN TOP 25

SUMMER 2015 ENDED UP DRIER THAN NORMAL OVER MOST OF UPPER MICHIGAN.
THE ONE EXCEPTION WAS THE AREA NEAR THE WISCONSIN BORDER...WHERE THE
TYPICALLY HIT-OR-MISS THUNDERSTORMS WERE MORE FREQUENT AWAY FROM THE
STABILIZING INFLUENCE OF THE GREAT LAKES. JUNE THROUGH AUGUST
PRECIPITATION WAS AT LEAST CLOSER TO NORMAL IN THIS REGION.
---------------------------------------------------------------------
SOME OTHER TEMPERATURE AND PRECIPITATION OBSERVATIONS ACROSS UPPER
MICHIGAN IN AUGUST 2015 INCLUDE:

IRONWOOD...AVERAGE TEMPERATURE 63.2 (0.9 DEGREE BELOW NORMAL)
           PRECIPITATION 2.56 INCHES (0.81 INCHES BELOW NORMAL)

WATERSMEET (GOGEBIC COUNTY)...PRECIPITATION 3.69 INCHES

GREENLAND (ONTONAGON COUNTY)...AVERAGE TEMPERATURE 63.0 DEGREES
                               PRECIPITATION 2.55 INCHES

BERGLAND DAM (ONTONAGON COUNTY)...AVERAGE TEMPERATURE 62.8 DEGREES
                                  PRECIPITATION 2.69 INCHES

HOUGHTON COUNTY...AVERAGE TEMPERATURE 64.5 (0.6 DEGREE ABOVE NORMAL)
 AIRPORT          PRECIPITATION 2.51 INCHES (0.10 INCH ABOVE NORMAL)

MOHAWK (KEWEENAW COUNTY)...PRECIPITATION 3.07 INCHES

COPPER HARBOR...AVERAGE TEMPERATURE 65.5 DEGREES
                PRECIPITATION 2.23 INCHES

JACOBSVILLE (HOUGHTON COUNTY)...AVERAGE TEMPERATURE 63.2 DEGREES
                                PRECIPITATION 1.84 INCHES

BARAGA...AVERAGE TEMPERATURE 65.1 DEGREES
         PRECIPITATION 1.67 INCHES

HERMAN (BARAGA COUNTY)...PRECIPITATION 2.80 INCHES

CLARKSBURG (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 61.7 DEGREES
                                PRECIPITATION 2.43 INCHES

MARQUETTE CITY...AVERAGE TEMPERATURE 66.2 (0.4 DEGREE BELOW NORMAL)
                 PRECIPITATION 2.99 INCHES (0.36 INCH ABOVE NORMAL)

HARVEY (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 66.4 DEGREES
                            PRECIPITATION 1.70 INCHES

CHATHAM (ALGER COUNTY)...AVERAGE TEMPERATURE 64.6 DEGREES
                         PRECIPITATION 1.86 INCHES

MUNISING...AVERAGE TEMPERATURE 63.4 (1.1 DEGREES BELOW NORMAL)
           PRECIPITATION 2.33 INCHES (1.15 INCHES BELOW NORMAL)

NEWBERRY...AVERAGE TEMPERATURE 64.7 (0.1 DEGREE ABOVE NORMAL)
           PRECIPITATION 1.73 INCHES (1.50 INCHES BELOW NORMAL)

STAMBAUGH (IRON COUNTY)...AVERAGE TEMPERATURE 61.9 DEGREES
                          PRECIPITATION 3.56 INCHES

AMASA (IRON COUNTY)...AVERAGE TEMPERATURE 63.6 DEGREES
                      PRECIPITATION 5.45 INCHES

FORD AIRPORT...AVERAGE TEMPERATURE 65.6 DEGREES
 NEAR IRON MOUNTAIN

IRON MOUNTAIN...AVERAGE TEMPERATURE 65.8 (0.6 DEGREE BELOW NORMAL)
                PRECIPITATION 3.41 INCHES (0.15 INCH ABOVE NORMAL)

NORWAY (DICKINSON COUNTY)...AVERAGE TEMPERATURE 65.6 DEGREES
                            PRECIPITATION 3.30 INCHES

DAGGETT (MENOMINEE COUNTY)...PRECIPITATION 3.16 INCHES

MENOMINEE...PRECIPITATION 3.88 INCHES

ESCANABA...PRECIPITATION 3.03 INCHES

GLADSTONE (DELTA COUNTY)...PRECIPITATION 3.46 INCHES

GARDEN CORNERS (DELTA COUNTY)...AVERAGE TEMPERATURE 63.9 DEGREES
                                PRECIPITATION 3.69 INCHES

COOKS (SCHOOLCRAFT COUNTY)...PRECIPITATION 3.45 INCHES

MANISTIQUE...AVERAGE TEMPERATURE 64.0 (0.6 DEGREE BELOW NORMAL)
             PRECIPITATION 2.60 INCHES (0.65 INCH BELOW NORMAL)

                        AUGUST WEATHER SUMMARY

MORE TO COME LATER.

                          SEPTEMBER FORECAST

THE CLIMATE PREDICTION CENTER (CPC) IS FORECASTING A GREATER THAN
CLIMATOLOGICAL CHANCE OF AN ABOVE NORMAL MONTHLY MEAN TEMPERATURE OVER
ALL OF UPPER MICHIGAN IN SEPTEMBER 2015. THE CPC INDICATES THERE IS A
GREATER THAN CLIMATOLOGICAL CHANCE OF ABOVE NORMAL MONTHLY PRECIPITATION
OVER THE WEST HALF OF UPPER MICHIGAN BUT AN EQUAL CHANCE OF ABOVE AND
BELOW NORMAL MONTHLY PRECIPITATION OVER THE EAST HALF IN SEPTEMBER.

                         SEPTEMBER CLIMATOLOGY

AVERAGE TEMPERATURES IN SEPTEMBER BEGIN TO FALL SHARPLY...ABOUT 8 TO
9 DEGREES LOWER THAN IN AUGUST...AS SUMMER TRANSITIONS TO AUTUMN AND
DAYLIGHT GROWS SHORTER. THE AUTUMNAL EQUINOX THIS YEAR IS AT 420 AM
EDT ON 9/23. POSSIBLE SUNSHINE IN SEPTEMBER DECLINES FROM 800
MINUTES ON 9/1 TO 706 MINUTES ON 9/30...A DECREASE OF 3 TO 4 MINUTES
EACH DAY.

ALTHOUGH THE DAYS GROW SHORTER DURING THE NINTH MONTH...MID SUMMER
LIKE WARMTH CAN STILL GRIP UPPER MICHIGAN DURING SEPTEMBER. ON
9/12/98...RESIDENTS OF IRON MOUNTAIN SIZZLED IN 98-DEGREE HEAT. BOTH
IRON MOUNTAIN AND IRONWOOD RECORDED HIGH TEMPERATURES ABOVE 90 FIVE
DAYS IN A ROW DURING A TORRID MID SEPTEMBER HEATWAVE BETWEEN 9/8 AND
9/12 IN 1931. WITH TEMPERATURES AVERAGING 7 TO 8 DEGREES ABOVE
NORMAL...SEPTEMBER 1931 GOES DOWN IN THE RECORD BOOKS AS THE WARMEST
SEPTEMBER EVER OBSERVED AT IRON MOUNTAIN AND IRONWOOD. MORE RECENTLY
IN 2002...MANY PLACES BAKED IN 90-DEGREE HEAT FOR THREE DAYS IN A
ROW ON 9/7 THROUGH 9/9.

MONTHLY TEMPERATURES RAN 3 TO 8 DEGREES ABOVE NORMAL IN SEPTEMBER
2004...WHICH IS THE WARMEST SEPTEMBER SINCE RECORDS BEGAN AT
ONTONAGON AND THE MARQUETTE NWS. THE MONTHLY AVERAGE TEMPERATURE OF
61.8 AT THE MARQUETTE NWS WAS ONLY A TENTH OF A DEGREE LOWER THAN
THE 61.9 READING OBSERVED IN JULY 2004. SEPTEMBER 2004 ALSO RANKS IN
THE LIST OF TOP TEN WARMEST AT IRON MOUNTAIN...MARQUETTE
CITY...NEWBERRY...MUNISING...AND IRONWOOD. SEPTEMBER 2009 WAS ALSO
QUITE BALMY WITH MONTHLY AVERAGE TEMPERATURES 4 TO 6 DEGREES ABOVE
THE 1971-2000 MEAN. THAT MONTH WAS AMONG THE TOP 10 WARMEST
SEPTEMBERS AT MOST LOCATIONS IN UPPER MICHIGAN.

BUT WINTER OFTEN MAKES ITS FIRST RETURN BY LATE IN THE MONTH. THE
GROWING SEASON ENDS EVERYWHERE EXCEPT ALONG THE WARMER GREAT LAKES
SHORES DURING SEPTEMBER WITH AN INCREASED PROBABILITY OF KILLING
FROST. RECORD LOW TEMPERATURES OVER INLAND AREAS FALL INTO THE 20S
DURING THE MONTH AND EVEN INTO THE UPPER TEENS AT MANY LOCATIONS
TOWARD MONTHS END. ON 9/22/95...THE WESTERN UPPER PENINSULA WAS
STRUCK WITH AN EARLY SEASON SNOWSTORM. IRONWOOD PICKED UP 6.5
INCHES...AND HOUGHTON ALSO SAW 3 INCHES OF THE WHITE STUFF THAT DAY.
AT LEAST AN INCH OF SNOW HAS FALLEN ON PORTIONS OF UPPER MICHIGAN
DURING LATE SEPTEMBER IN 1965...1974...1989...AND 1993.

AS THE JET STREAM SINKS FARTHER SOUTH DURING SEPTEMBER AND INTERACTS
WITH FAIRLY WARM AND HUMID AIRMASSES STILL RESIDENT OVER THE UNITED
STATES...AVERAGE MONTHLY PRECIPITATION OVER MUCH OF UPPER MICHIGAN
PEAKS AT A YEARLY MAXIMUM BETWEEN 3.5 AND 4.0 INCHES. ALTHOUGH
CONVECTION OCCURS LESS FREQUENTLY THAN DURING MID SUMMER...
THUNDERSTORMS STILL PRESENT A SEVERE WEATHER AND HEAVY RAIN THREAT.
IRONWOOD WAS INUNDATED WITH 10.74" OF RAIN DURING SEPTEMBER 1926.

                OUTLOOK FOR FALL AND EARLY WINTER

THE CLIMATE PREDICTION CENTER (CPC) IS FORECASTING A GREATER THAN
CLIMATOLOGICAL CHANCE OF AN ABOVE NORMAL 3-MONTH AVERAGE TEMPERATURE
AND BELOW AVERAGE 3-MONTH PRECIPITATION OVER ALL OF UPPER MICHIGAN
IN OCTOBER THROUGH DECEMBER 2015. THESE FORECAST TEMPERATURE AND
PRECIPITATION ANOMALIES ARE DUE TO A GROWING EL NINO IN THE TROPICAL
EASTERN PACIFIC OCEAN.

GO TO HTTP://WWW.WEATHER.GOV/CLIMATE/L3MTO.PHP TO ACCESS DETAILED
LOCAL THREE-MONTH AVERAGE TEMPERATURE OUTLOOKS FOR A NUMBER OF SITES
IN UPPER MICHIGAN.

CHECK OUT HTTP://WWW.CPC.NCEP.NOAA.GOV FOR MORE INFORMATION ABOUT
THE CLIMATE PREDICTION CENTER AND MORE LONG RANGE PREDICTIONS.

NOTE THAT STATISTICS FOR THE NATIONAL WEATHER SERVICE OFFICE IN
NEGAUNEE TOWNSHIP ARE BASED ON RECORDS WHICH BEGAN IN OCTOBER 1961.
THIRTY YEAR NORMALS USED ARE FOR THE PERIOD OF 1981 THROUGH 2010.
NOTE ALL TEMPERATURES ARE IN FAHRENHEIT AND PRECIPITATION IS IN
INCHES. ALL CLIMATE DATA LISTED IN THIS PRODUCT ARE UNOFFICIAL. FOR
OFFICIAL DATA...PLEASE REFER TO THE NATIONAL CLIMATIC DATA CENTER.
ALSO NOTE THIS DISCUSSION DOES NOT INCLUDE DATA FROM CHIPPEWA AND
MACKINAC COUNTIES.

NWS MARQUETTE WEB PAGE IS AT HTTP://WWW.WEATHER.GOV/MQT (ALL LOWER
CASE). CONTACT THE NATIONAL CLIMATIC DATA CENTER AT (828) 271-4800
OR WWW.NCDC.NOAA.GOV.

$$

KC



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