Climatological Report (Monthly)
Issued by NWS Marquette, MI

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000
CXUS53 KMQT 081518 AAA
CLMMQT

CLIMATE REPORT...PRELIMINARY
NATIONAL WEATHER SERVICE MARQUETTE MI
1118 AM EDT THU OCT 8 2015

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

...THE MARQUETTE MI CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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              93   09/09/2002
 LOW               21   09/27/1965
HIGHEST            86   09/01        63      23       79  09/28
                                                          09/27
LOWEST             30   09/30        44     -14       33  09/22
                                                          09/13
                                                          09/12
AVG. MAXIMUM     71.7              65.8     5.9     65.7
AVG. MINIMUM     51.0              45.8     5.2     45.5
MEAN             61.4              55.8     5.6     55.6
DAYS MAX >= 90      0               0.1    -0.1        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      2               1.6     0.4        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.60   1968
 MINIMUM         1.21   1989
TOTALS           1.60              3.72   -2.12     4.10
DAILY AVG.       0.05              0.12   -0.07     0.14
DAYS >= .01         8              13.4    -5.4        9
DAYS >= .10         5               7.8    -2.8        6
DAYS >= .50         0               2.5    -2.5        2
DAYS >= 1.00        0               0.7    -0.7        1
GREATEST
 24 HR. TOTAL    0.82   09/06 TO 09/07

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.7   1993
TOTALS            0.0               0.1    -0.1      0.0
SINCE 7/1         0.0               0.1    -0.1        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   MM

DEGREE_DAYS
HEATING TOTAL     165               297    -132      280
 SINCE 7/1        333               482    -149      527
COOLING TOTAL      65                21      44        5
 SINCE 1/1        247               241       6      152
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              MM
HIGHEST WIND SPEED/DIRECTION    MM        DATE   MM
HIGHEST GUST SPEED/DIRECTION    31/180    DATE  09/21

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                3     RAIN                       2
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     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.

&&

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

...WELL ABOVE NORMAL MONTHLY MEAN TEMPERATURE...
...RECORD WARMEST SEPTEMBER AT NEWBERRY AND MANISTIQUE...
...SECOND WARMEST SEPTEMBER AT MARQUETTE CITY AND MUNISING...
...SECOND WARMEST SEPTEMBER AT THE MARQUETTE NWS AND HOUGHTON...
...THIRD WARMEST SEPTEMBER AT IRON MOUNTAIN...
...FOURTH WARMEST SEPTEMBER AT IRONWOOD...

...GENERALLY DRY OVER THE NORTH AND WETTER ACROSS THE SOUTH...
...THIRD DRIEST SEPTEMBER AT HOUGHTON...
...FIFTH DRIEST SEPTEMBER AT THE MARQUETTE NWS...

SEPTEMBER CLIMATE STATISTICS FOR THE MARQUETTE NWS IN NEGAUNEE
 TOWNSHIP

                                    NORMAL   DEPARTURE
AVERAGE TEMPERATURE         61.4     55.8   PLUS    5.6
AVERAGE HIGH TEMPERATURE    71.7     65.8   PLUS    5.9
AVERAGE LOW TEMPERATURE     51.0     45.8   PLUS    5.2
HEATING DEGREE DAYS          165      297  MINUS    132
COOLING DEGREE DAYS           65       21   PLUS     44
TOTAL PRECIPITATION         1.60     3.72  MINUS   2.12
TOTAL SNOWFALL               0.0      0.1  MINUS    0.1

HIGHEST TEMPERATURE:                    86 ON 9/1
LOWEST TEMPERATURE:                     30 ON 9/30
GREATEST CALENDAR DAY PRECIPITATION:  0.48 ON 9/7
GREATEST 24 HOUR PRECIPITATION:       0.82 ON 9/6-9/7
GREATEST CALENDAR DAY SNOWFALL:        0.0
PEAK WIND SPEED:     31 MPH FROM THE SOUTH ON 9/21

DAILY RECORD HIGH MINIMUM TEMPERATURE TIED ON 9/7...65 /OLD RECORD
                                                        65...1970/
DAILY RECORD HIGH MAXIMUM TEMPERATURE ON 9/15...84 /82...1991/
DAILY RECORD HIGH MINIMUM TEMPERATURE ON 9/16...61 /60...1992/
DAILY RECORD HIGH MAXIMUM TEMPERATURE ON 9/16...81 /79...2012/
DAILY RECORD HIGH MINIMUM TEMPERATURE ON 9/17...62 /61...1968/
DAILY RECORD HIGH MINIMUM TEMPERATURE ON 9/25...55 /54...2014/
DAILY RECORD HIGH MINIMUM TEMPERATURE ON 9/27...56 /55...1986/
SECOND HIGHEST SEPTEMBER MEAN TEMPERATURE...61.4 /RECORD 61.8...2004/
FIFTH LOWEST SEPTEMBER PRECIPITATION...1.60 /RECORD 1.21...1989/
---------------------------------------------------------------------
GREAT LAKES WATER LEVELS (FEET/METERS ABOVE MEAN SEA LEVEL)

                            LAKE SUPERIOR  LAKE MICHIGAN-HURON
09/01/15 DAILY MEAN         602.65/183.69     579.74/176.70
09/30/15 DAILY MEAN         602.61/183.67     579.59/176.66
AVG AUG 2015 DAILY MEAN     602.63/183.68     579.81/176.72
AVG SEP 2014 DAILY MEAN     602.68/183.70     579.11/176.51
LONG TERM SEP DAILY MEAN    602.13/183.53     579.07/176.50
MAXIMUM SEP DAILY MEAN      603.22/183.86     581.96/177.38
                                (1985)           (1986)
MINIMUM SEP DAILY MEAN      600.46/183.02     576.64/175.76
                                (2007)           (1964)

...GREAT LAKES WATER LEVELS REMAIN NEARLY STEADY AND WELL ABOVE
NORMAL IN SEPTEMBER...

WATER LEVELS ON THE WESTERN GREAT LAKES REMAINED NEARLY STEADY IN
SEPTEMBER...AS IS NORMAL. AT THE END OF SEPTEMBER...WATER LEVELS ON
LAKE SUPERIOR WERE 5 TO 6 INCHES ABOVE NORMAL AND ABOUT THE SAME AS
IN SEPTEMBER 2014. THE LEVEL ON LAKES MICHIGAN AND HURON WAS 6 TO
7 INCHES ABOVE AVERAGE ON 9/30 AND 5 TO 6 INCHES HIGHER THAN DURING
SEPTEMBER 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).
---------------------------------------------------------------------
                     SEPTEMBER CLIMATE HIGHLIGHTS

HIGHEST REPORTED TEMPERATURE...91 AT PELKIE IN BARAGA COUNTY ON 9/5
                                AND AT AHMEEK IN KEWEENAW COUNTY ON
                                9/15 AND 9/16

LOWEST REPORTED TEMPERATURE...22 NEAR COVINGTON IN BARAGA COUNTY
                               ON 9/30

HIGHEST AVERAGE TEMPERATURE...64.5 DEGREES AT MARQUETTE AND BARAGA

LOWEST AVERAGE TEMPERATURE...59.5 DEGREES AT STAMBAUGH IN
                              IRON COUNTY

HIGHEST MONTHLY PRECIPITATION...5.93 INCHES AT GARDEN CORNERS IN
                                 DELTA COUNTY

LOWEST MONTHLY PRECIPITATION...0.60 INCH AT AHMEEK IN KEWEENAW COUNTY

A PERSISTENT UPPER RIDGE THAT DOMINATED CENTRAL AND EASTERN NORTH
AMERICA DOWNSTREAM OF A TROUGH OVER THE WEST IN SEPTEMBER 2015
RESULTED IN A TOP FIVE WARMEST SEPTEMBER AT MOST PLACES IN UPPER
MICHIGAN AND A RECORD WARMEST ONE AT NEWBERRY AND MANISTIQUE. MEAN
MONTHLY TEMPERATURES RANGING FROM 59.5 DEGREES AT STAMBAUGH TO 64.5
DEGREES AT MARQUETTE AND BARAGA ARE ABOUT 5 TO 7 DEGREES ABOVE THE
SEPTEMBER NORMAL. EVEN THOUGH THE TYPICAL SEPTEMBER AVERAGES 7 TO 9
DEGREES COOLER THAN THE EIGHTH MONTH...SEPTEMBER 2015 ENDED UP ONLY
1 TO 3 DEGREES COOLER THAN AUGUST 2015 DUE TO THE TENACITY OF WARMER
AIR UNDER THE UPPER RIDGE.

AS WAS THE CASE IN AUGUST...MONTHLY PRECIPITATION IN SEPTEMBER
TENDED TO BE GREATER OVER THE SOUTH HALF THAN ACROSS THE NORTH EVEN
THOUGH THE DOMINATING UPPER RIDGE TENDED TO SUPPRESS THE DEVELOPMENT
OF LARGER SCALE LOW PRESSURE SYSTEMS OVER THE ENTIRE AREA. SOME
LOCATIONS ACROSS THE KEWEENAW REPORTED LESS THAN AN INCH OF RAIN IN
SEPTEMBER. ONLY 0.95 INCH FELL AT HOUGHTON...THE THIRD LOWEST
SEPTEMBER TOTAL THERE SINCE 1887 AND A MERE QUARTER OF THE MONTHLY
NORMAL. AHMEEK IN KEWEENAW COUNTY PICKED UP ONLY 0.60 INCH. ON THE
OTHER HAND...A NUMBER OF PLACES OVER THE SOUTH HALF SAW 4 INCHES OR
MORE OF RAIN AND AS MUCH AS 5.93 INCHES AT GARDEN CORNERS IN DELTA
COUNTY...ABOUT 150 PERCENT OF NORMAL THERE. THE MAIN CAUSE OF THIS
SHARP DIFFERENCE IN MONTHLY PRECIPITATION BETWEEN THE NORTH AND
SOUTH WAS THE OCCURRENCE OF HEAVIER RAIN UNDER THE SHOWERS AND
THUNDERSTORMS THAT PASSED OVER THE SOUTH ON 9/3...9/6 AND 9/10.

THERE WERE FOUR WARM SPELLS OF NOTE IN SEPTEMBER. MEAN DAILY
TEMPERATURES ON 9/1...OVER LABOR DAY WEEKEND FROM 9/5 THROUGH 9/7...
ON 9/14 THROUGH 9/17 AND THEN AGAIN ON 9/25 INTO 9/28 RAN FROM 10 TO
15 DEGREES ABOVE NORMAL. AT LEAST ONE OR TWO LOCATIONS SAW THE
THERMOMETER READ AS HIGH AS 90 ON 9/1...9/5...9/15 AND 9/16. LOW
TEMPERATURES ON MANY DAYS DURING THESE WARM PERIODS WERE 60 DEGREES
OR HIGHER. SEVERAL LOCATIONS...INCLUDING MANISTIQUE...NEWBERRY...
MUNISING AND THE MARQUETTE NWS...SAW A RECORD NUMBER OF SEPTEMBER
DAYS WITH A MINIMUM TEMPERATURE OF 60 OR HIGHER IN 2015. MANISTIQUE
LED THE PACK WITH 13 DAYS.

THE ONLY COOL PERIODS DURING SEPTEMBER OCCURRED WHEN THE UPPER RIDGE
GAVE WAY TO AN UPPER TROUGH IN THE GREAT LAKES FROM 9/10 INTO 9/13
AND AT MONTHS END ON 9/29 THROUGH 9/30. MEAN DAILY TEMPERATURES
AVERAGED UP TO 10 DEGREES BELOW NORMAL DURING THESE TIMES. AT A FEW
INTERIOR LOCATIONS...THE MERCURY FELL INTO THE 20S NEAR SUNRISE ON
9/12...9/13 AND 9/30.

NOTABLE PRECIPITATION EVENTS IN SEPTEMBER WERE RELATIVELY FEW.
CLUSTERS OF SHOWERS AND THUNDERSTORMS ASSOCIATED WITH A DISTURBANCE
MOVING THROUGH THE UPPER GREAT LAKES AND OVER THE TOP OF THE UPPER
RIDGE IN THE UNITED STATES DROPPED SOME HEAVY RAIN FROM 9/2 INTO THE
EARLY MORNING ON 9/3 OVER MAINLY THE SOUTH HALF. AN INCH OR MORE OF
RAIN FELL AT MANY PLACES IN THIS AREA...WITH AS MUCH AS 2.97 INCHES
NEAR PEAVY FALLS IN IRON COUNTY. A FEW OF THE STRONGER THUNDERSTORMS
TRACKING NEAR THE WISCONSIN BORDER ALSO TURNED SEVERE IN THE MORNING
ON 9/2 AND DROPPED HAIL AS LARGE AS GOLF BALLS NEAR POWERS IN
MENOMINEE COUNTY.

NUMEROUS SHOWERS AND THUNDERSTORMS ACCOMPANIED THE PASSAGE OF A COLD
FRONT ACROSS THE UPPER PENINSULA FROM LATE ON 9/6 INTO 9/7. SOME
PLACES OVER THE WEST PICKED UP AN INCH OR MORE OF RAIN. IRONWOOD WAS
INUNDATED WITH 3.45 INCHES OF RAIN...A TOTAL THAT ESTABLISHED A NEW
24-HOUR RECORD FOR ANY DAY IN SEPTEMBER AT THAT LOCATION. SOME
SHOWERS AND THUNDERSTORMS AHEAD OF THE COLD FRONT RESPONSIBLE FOR
THE BRIEF MID-MONTH COOL SPELL TRACKED OVER UPPER MICHIGAN ON 9/9
INTO 9/10. THIS TIME...THE HEAVIEST RAIN FELL OVER THE SOUTHEAST
HALF...WHERE GARDEN CORNERS MEASURED 2.11 INCHES.

A WAVE OF LOW PRESSURE MOVING NORTHEAST ALONG A STATIONARY FRONT IN
THE CENTRAL GREAT LAKES BROUGHT A PERIOD OF RAIN TO MAINLY THE
SOUTHEAST HALF OF UPPER MICHIGAN AGAIN FROM LATE ON 9/18 INTO 9/19.
NEWBERRY SAW 0.97 INCH OF RAIN DURING THIS EVENT. THE LAST
WIDESPREAD RAIN TO IMPACT THE AREA IN SEPTEMBER OCCURRED ON 9/28 AS
THE COLD FRONT MARKING THE LEADING EDGE OF THE CHILLY CANADIAN
AIRMASS THAT INVADED AT THE END OF THE MONTH CROSSED THE AREA.
ANOTHER LOW PRESSURE SYSTEM MOVING ALONG THIS FRONT CAUSED A MORE
WIDESPREAD RAIN ACROSS MAINLY THE SOUTHEAST HALF AGAIN. SENEY IN
SCHOOLCRAFT COUNTY REPORTED AS MUCH AS 1.10 INCHES.
---------------------------------------------------------------------
                ...SEPTEMBER 2015 MEAN TEMPERATURE...

                       ...TOP FIVE WARMEST...

               OBSERVED  NORMAL  DEPARTURE    RECORD      2015 RANK

NEWBERRY         63.0     57.1     +5.9    62.9 /2002/ RECORD WARMEST

MANISTIQUE       61.9     57.0     +4.9    57.8 /1992/ RECORD WARMEST

HOUGHTON         62.5     55.4     +7.1    62.7 /1908/    2ND WARMEST

MARQUETTE NWS    61.4     55.8     +5.6    61.8 /2004/    2ND WARMEST

MARQUETTE CITY   64.5     59.4     +5.1    64.6 /2005/    2ND WARMEST

MUNISING         62.3     57.3     +5.0    63.3 /1931/    2ND WARMEST

IRON MOUNTAIN    63.9     57.6     +6.3    65.4 /1908/    3RD WARMEST

IRONWOOD         61.9     55.7     +6.2    63.4 /1931/    4TH WARMEST

                  ...SEPTEMBER 2015 PRECIPITATION...

           ...DRY OVER THE NORTH AND WETTER TO THE SOUTH...

               OBSERVED  NORMAL  DEPARTURE    RECORD      2015 RANK

HOUGHTON         0.95     3.45    -2.50    0.87 /1887/    3RD DRIEST

MARQUETTE NWS    1.60     3.72    -2.12    1.21 /1989/    5TH DRIEST

MUNISING         2.19     4.07    -1.88    0.59 /1967/   14TH DRIEST

MARQUETTE CITY   1.67     3.16    -1.49    0.53 /1893/   22ND DRIEST

MANISTIQUE       2.78     3.76    -0.98    0.74 /1967/      ****

NEWBERRY         3.65     3.81    -0.16    0.51 /2009/      ****

IRON MOUNTAIN    3.54     3.62    -0.08    0.54 /1909/      ****

IRONWOOD         4.90     4.06    +0.84   10.74 /1926/  25TH WETTEST

**** NOT IN TOP 25
---------------------------------------------------------------------
SOME OTHER TEMPERATURE AND PRECIPITATION OBSERVATIONS ACROSS UPPER
MICHIGAN IN SEPTEMBER 2015 INCLUDE:

IRONWOOD...AVERAGE TEMPERATURE 61.9 (6.2 DEGREES ABOVE NORMAL)
           PRECIPITATION 4.90 INCHES (0.84 INCH ABOVE NORMAL)

WATERSMEET (GOGEBIC COUNTY)...PRECIPITATION 3.29 INCHES

GREENLAND (ONTONAGON COUNTY)...AVERAGE TEMPERATURE 61.8 DEGREES
                               PRECIPITATION 4.99 INCHES

BERGLAND DAM (ONTONAGON COUNTY)...AVERAGE TEMPERATURE 60.9 DEGREES
                                  PRECIPITATION 3.69 INCHES

HOUGHTON COUNTY...AVERAGE TEMPERATURE 62.5 (7.1 DEGREES ABOVE NORMAL)
 AIRPORT          PRECIPITATION 0.95 INCH (2.50 INCH BELOW NORMAL)

AHMEEK (KEWEENAW COUNTY)...AVERAGE TEMPERATURE 63.4 DEGREES
                           PRECIPITATION 0.60 INCH

COPPER HARBOR...AVERAGE TEMPERATURE 64.4 DEGREES
                PRECIPITATION 1.03 INCHES

JACOBSVILLE (HOUGHTON COUNTY)...AVERAGE TEMPERATURE 61.2 DEGREES
                                PRECIPITATION 2.73 INCHES

BARAGA...AVERAGE TEMPERATURE 64.5 DEGREES
         PRECIPITATION 1.65 INCHES

HERMAN (BARAGA COUNTY)...PRECIPITATION 1.98 INCHES

CLARKSBURG (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 60.7 DEGREES
                                PRECIPITATION 1.35 INCHES

BIG BAY (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 64.1 DEGREES
                             PRECIPITATION 1.60 INCHES

MARQUETTE CITY...AVERAGE TEMPERATURE 64.5 (5.1 DEGREES ABOVE NORMAL)
                 PRECIPITATION 1.67 INCHES (1.49 INCHES BELOW NORMAL)

HARVEY (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 63.8 DEGREES
                            PRECIPITATION 1.61 INCHES

CHATHAM (ALGER COUNTY)...AVERAGE TEMPERATURE 63.1 DEGREES
                         PRECIPITATION 2.41 INCHES

MUNISING...AVERAGE TEMPERATURE 62.3 (5.0 DEGREES ABOVE NORMAL)
           PRECIPITATION 2.19 INCHES (1.88 INCHES BELOW NORMAL)

NEWBERRY...AVERAGE TEMPERATURE 63.0 (5.9 DEGREES ABOVE NORMAL)
           PRECIPITATION 3.65 INCHES (0.16 INCH BELOW NORMAL)

STAMBAUGH (IRON COUNTY)...AVERAGE TEMPERATURE 59.5 DEGREES
                          PRECIPITATION 3.64 INCHES

AMASA (IRON COUNTY)...AVERAGE TEMPERATURE 61.3 DEGREES
                      PRECIPITATION 2.10 INCHES

FORD AIRPORT...AVERAGE TEMPERATURE 62.6 DEGREES
 NEAR IRON MOUNTAIN

IRON MOUNTAIN...AVERAGE TEMPERATURE 63.9 (6.3 DEGREES ABOVE NORMAL)
                PRECIPITATION 3.54 INCHES (0.08 INCH BELOW NORMAL)

DAGGETT (MENOMINEE COUNTY)...PRECIPITATION 4.05 INCHES

MENOMINEE...PRECIPITATION 3.68 INCHES

ESCANABA...PRECIPITATION 3.66 INCHES

GLADSTONE (DELTA COUNTY)...PRECIPITATION 3.79 INCHES

GARDEN CORNERS (DELTA COUNTY)...AVERAGE TEMPERATURE 63.0 DEGREES
                                PRECIPITATION 5.93 INCHES

COOKS (SCHOOLCRAFT COUNTY)...PRECIPITATION 3.50 INCHES

MANISTIQUE...AVERAGE TEMPERATURE 61.9 (4.9 DEGREES ABOVE NORMAL)
             PRECIPITATION 2.78 INCHES (0.98 INCH BELOW NORMAL)

                       SEPTEMBER WEATHER SUMMARY

MORE TO COME LATER.

                           OCTOBER FORECAST

THE CLIMATE PREDICTION CENTER (CPC) IS FORECASTING A GREATER THAN
CLIMATOLOGICAL CHANCE OF AN ABOVE NORMAL MONTHLY MEAN TEMPERATURE
AND BELOW NORMAL PRECIPITATION OVER ALL OF UPPER MICHIGAN IN OCTOBER
2015.

                         OCTOBER CLIMATOLOGY

AVERAGE TEMPERATURES IN OCTOBER CONTINUE THEIR DOWNWARD SPIRAL AS
THE SUN STAYS UP LESS AND LESS EACH DAY. THE OCTOBER MEAN
TEMPERATURE ACROSS UPPER MICHIGAN IS ABOUT TEN DEGREES LOWER THAN IN
SEPTEMBER AT MOST PLACES. POSSIBLE DAILY SUNSHINE DECREASES ABOUT 3
OR 4 MINUTES EVERY DAY DURING THE TENTH MONTH FROM 703 MINUTES ON
10/1 TO 607 MINUTES ON HALLOWEEN.

ALTHOUGH AVERAGE TEMPERATURES DECREASE DURING OCTOBER...RECORD HIGH
TEMPERATURES AT MANY PLACES IN UPPER MICHIGAN ARE STILL IN THE 80S
DURING THE FIRST WEEK OF THE MONTH. IN FACT...RESIDENTS OF IRON
MOUNTAIN BASKED IN A SUMMER-LIKE HIGH OF 88 ON 10/3/92. DOWNTOWN
MARQUETTE ENJOYED A TASTE OF SUMMER EVEN AS LATE AS 10/18 IN 1950...
WHEN THE MERCURY REACHED A BALMY 86 DEGREES.

BUT BY THE END OF OCTOBER...THE ICY HAND OF WINTER USUALLY BEGINS TO
GRIP UPPER MICHIGAN HARDER AND HARDER. RECORD LOW TEMPERATURES AT
MONTHS END FALL INTO THE TEENS EVERYWHERE AND EVEN AS LOW AS THE
SINGLE NUMBERS ABOVE ZERO AWAY FROM THE WARMING INFLUENCE OF LAKE
SUPERIOR. ON 10/30/1925...IRONWOOD RECORDED A LOW OF 2 DEGREES ABOVE
ZERO. OCTOBER 2002 WAS THE COLDEST OCTOBER ON RECORD AT THE
MARQUETTE NWS...AND AMONG THE TOP TEN COLDEST AT IRONWOOD AND IRON
MOUNTAIN. MONTHLY TEMPERATURES AVERAGED 4 TO 6 DEGREES BELOW NORMAL
ACROSS UPPER MICHIGAN. OCTOBER 2009 WAS ALSO QUITE CHILLY WITH AN
AVERAGE MONTHLY TEMPERATURE 3 TO 5 DEGREES BELOW THE MEAN. MUNISING
REPORTED THE COLDEST OCTOBER ON RECORD IN 2009...AND MANY PLACES
EXPERIENCED A TOP FIVE OR TEN COLDEST TENTH MONTH.

EVEN THOUGH AVERAGE PRECIPITATION IN OCTOBER IS LOWER THAN IN
SEPTEMBER AT MOST SPOTS...THE RESIDUAL WARMTH OF LAKE SUPERIOR
USUALLY CAUSES INCREASED LAKE EFFECT RAIN AND SNOW SHOWER ACTIVITY
DURING THE TENTH MONTH. MORE NUMEROUS ARCTIC AIR MASSES PLUNGING
SOUTH FROM CANADA ARE DESTABILIZED AS THEY CROSS THE RELATIVELY WARM
WATER...RESULTING IN THE INCREASED CONVECTIVE ACTIVITY. IF THE AIR
IS COLD ENOUGH...HEAVY SNOW CAN FALL...ESPECIALLY OVER HIGHER
TERRAIN JUST DOWNWIND OF LAKE SUPERIOR. BETWEEN 10/11 AND 10/14 IN
2006...AN UNUSUALLY EARLY WINTER STORM BLASTED THE HIGHER TERRAIN OF
THE WEST HALF OF UPPER MICHIGAN WITH 20 OR MORE INCHES OF SNOW...
INCLUDING AS MUCH AS 26.6 INCHES AT TWIN LAKES IN HOUGHTON COUNTY.
IN OCTOBER 1967...ALMOST 27 INCHES OF SNOW WHITENED IRONWOOD...
INCLUDING 15 INCHES ON 10/25/67. HEAVY SNOW CAN FALL EVEN EARLIER IN
THE MONTH. ON 10/6 TO 10/8 IN 2000...UP TO A FOOT OF SNOW SMOTHERED
THE HIGHER TERRAIN OF NORTH CENTRAL UPPER MICHIGAN. BUT DURING WARM
OCTOBERS...LITTLE OR NO SNOW CAN FALL AS WELL. THE MARQUETTE NWS SAW
NO SNOW AT ALL IN OCTOBER 1971...AS DID THE HOUGHTON COUNTY AIRPORT
IN 1986.

THE SAME SURFACE HEATING AND DESTABILIZATION OF COLD AIRMASSES THAT
CAUSES LAKE EFFECT SNOW ALSO RESULTS IN INCREASED WINDINESS OVER
LAKE SUPERIOR. THE GALES OF NOVEMBER OFTEN DO COME EARLY DURING
OCTOBER.

                  OUTLOOK FOR LATE FALL INTO WINTER

THE CLIMATE PREDICTION CENTER (CPC) IS FORECASTING A GREATER THAN
CLIMATOLOGICAL CHANCE OF AN ABOVE NORMAL 3-MONTH AVERAGE TEMPERATURE
AND BELOW NORMAL 3-MONTH PRECIPITATION OVER ALL OF UPPER MICHIGAN
IN NOVEMBER 2015 THROUGH JANUARY 2016. 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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