ANNUAL CLIMATOLOGICAL SUMMARY FOR DETROIT - 1999
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
303 PM EDT WED JAN 19 2000
 
JANUARY 1999

...A NORMAL MONTH TEMPERATURE-WISE?...NO WAY... AS THE SNOW PILED UP
   AND THEN MELTED AWAY...
...SECOND SNOWIEST JANUARY AND NINTH SNOWIEST MONTH ON RECORD...
...ONE OF THE WORST TWO WEEK STRETCH OF WINTER WEATHER IN DETROIT'S
   HISTORY...

JANUARY 1999 WILL BE WELL REMEMBERED ACROSS SOUTHEAST LOWER MICHIGAN
FOR THE "BLIZZARD OF '99". THE BLIZZARD ARRIVED EARLY ON THE 2ND AND
HOWLED INTO THE NIGHT. ALONG WITH THE HEAVY SNOW THAT FELL (11.3" ON
THE 2ND AND 3RD), STRONG EASTERLY WINDS BLEW IT INTO BIG DRIFTS
(1-3 FT). SNOWFALL ACROSS THE METRO AREA AVERAGED BETWEEN 10 TO
15 INCHES. THE STORM HIT NEW YEARS WEEKEND AND AIR TRAFFIC ALONG
WITH ROAD TRAFFIC WAS AT TIMES A NIGHTMARE!

MOTHER NATURE REPEATEDLY DUMPED MORE SNOW ON THE AREA INTO MID MONTH
AND SO, BY THE 15TH, OVER 23 INCHES HAD OFFICIALLY FALLEN AT DETROIT
METRO AIRPORT. IN ADDITION TO THE SNOW, TEMPERATURES AVERAGED ABOUT
11.4 DEGREES (-11.5 DEGREES BELOW NORMAL), WHICH AT THAT TIME,
COMPETED WITH OUR COLDEST JANUARY ON RECORD (12.8 DEGREES IN 1977).
IF YOU CONSIDER THE VERY COLD TEMPERATURES (AVERAGE - 11.4) AND
AMOUNT OF SNOWFALL (23.3), THAT FIRST TWO WEEK STRETCH OF JANUARY
WAS THE WORST STRETCH OF WINTER WEATHER IN DETROIT'S WEATHER HISTORY
(SINCE 1870) IN A CALENDAR MONTH.
 
THE SECOND HALF OF THE MONTH DID A COMPLETE ABOUT-FACE WITH MUCH
WARMER TEMPERATURES AND ONLY 4 INCHES MORE OF SNOW. IN FACT...DURING
THE SECOND HALF OF THE MONTH (16-31), TEMPERATURES AVERAGED CLOSE TO
34 DEGREES. THIS WAS NEARLY 23 DEGREES WARMER THAN THE FIRST HALF!
THESE WARMER TEMPERATURES PUSHED JANUARY'S AVERAGE BACK TO
0.2 DEGREES ABOVE NORMAL. WITH MUCH WARMER TEMPERATURES, HEAVY
RAINFALL, AND SNOWMELT, LOCAL URBAN AND RIVER FLOODING BECAME A
PROBLEM.

FEBRUARY 1999

...10TH WARMEST FEBRUARY ON RECORD...
...WARMEST DAY IN FEBRUARY EVER RECORDED...

THE TEMPERATURE ROLLER COASTER RIDE OF JANUARY CONTINUED THROUGH
FEBRUARY. DURING THE FIRST 2/3RDS OF FEBRUARY (THROUGH THE 19TH),
THE TEMPERATURE AVERAGED A HUGE 12 DEGREES ABOVE NORMAL, BUT IN THE
LAST THIRD, TEMPERATURES FELL BACK CLOSER TO NORMAL. THE MONTHLY
AVERAGE TEMPERATURE WAS A HEFTY 7.3 DEGREES ABOVE NORMAL. THIS MADE
IT THE 10TH WARMEST FEBRUARY IN DETROIT SINCE 1870. THE WARM WEATHER
FOR FEBRUARY PEAKED ON THE 11TH WHEN THE TEMPERATURE HIT 70 DEGREES.
THIS WAS THE WARMEST TEMPERATURE EVER RECORDED DURING ANY FEBRUARY
IN DETROIT AND ALSO WAS THE WARMEST TEMPERATURE SEEN SO EARLY IN THE
YEAR.

A STRONG COLD FRONT CREATED A SQUALL OF SHOWERS AND ISOLATED
THUNDERSTORMS DEVELOPED AS IT PASSED WITH WIND GUSTS MAINLY IN THE
40S AND 50S MPH (DETROIT METRO AIRPORT-46 MPH). JUST AS THE FRONT
APPROACHED, THE TEMPERATURE PEAKED AT 62 DEGREES EARLY ON THE 12TH.
THE TEMPERATURE THEN FELL ALL DAY TO 20 JUST BEFORE MIDNIGHT, SO THE
DIFFERENCE BETWEEN THE HIGH OF 62 AND LOW OF 20 WAS 42 DEGREES. THIS
CAME CLOSE TO THE RECORD FOR A DAILY TEMPERATURE CHANGE IN FEBRUARY
WHICH IS 45 DEGREES SET BACK IN 1885.

TOTAL PRECIPITATION FOR THE MONTH WAS SLIGHTLY ABOVE NORMAL (+.24).
EVEN WITH THE WARMER THAN NORMAL TEMPERATURES, SNOWFALL STILL
MANAGED TO TOTAL UP TO 7.8 INCHES. THIS WAS ONLY ABOUT AN
1 1/2 INCHES BELOW THE NORMAL OF 9.2 INCHES. NEARLY ALL THE SNOW
FELL IN 2 STORMS, 4.2 INCHES ON THE 7TH AND 3.4 INCHES ON THE 24TH
AND 25TH.

MARCH 1999

...IN LIKE A LION...OUT LIKE A LAMB....
...EIGHTH DRIEST MARCH ON RECORD BUT YET THE 16TH SNOWIEST....

AFTER AN UNSEASONABLY WARM FEBRUARY, THE COLD AIR THAT WAS STORED UP
IN THE ARCTIC MOST OF FEBRUARY PLUNGED INTO MICHIGAN DURING THE
FIRST WEEK OF MARCH. TEMPERATURES QUICKLY REVERSED COURSE AND BY
MID-MONTH, AVERAGED ABOUT FOUR DEGREES BELOW NORMAL. TEMPERATURES
MODERATED NICELY AFTER MID-MONTH AND BY THE LAST WEEK, ABUNDANT
SUNSHINE COMBINED WITH MAINLY ABOVE NORMAL TEMPERATURES, GAVE A
PLEASANT SPRING ENDING TO A MONTH THAT HAD A UNPLEASANT WINTER
BEGINNING.

A SNOWSTORM ON THE 5TH-6TH, GENERALLY DUMPED BETTER THAN 8 INCHES OF
SNOW ON THE AREA. A STRONG EASTERLY WIND CAUSED WIDESPREAD DRIFTING
AND BLOWING SNOW. ANOTHER STORM CLIPPED THE AREA ON THE 9TH,
BRINGING 2 TO 5 INCHES OF SNOW TO THE AREA. THE SNOWFALL TOTAL
OF 13.2 INCHES FOR THE MONTH MADE MARCH THE 16TH SNOWIEST ON RECORD
SINCE 1870. STRANGELY ENOUGH, EVEN WITH SURPLUS OF SNOW, MARCH WAS A
DRY MONTH OVERALL WITH ONLY 1.12 INCHES OF THE NORMAL (2.55 INCHES)
FALLING. THIS PLACED MARCH OF 1999 IN 8TH PLACE FOR DRIEST MARCH
ON RECORD.

APRIL 1999

...7TH WETTEST APRIL ON RECORD....
...RECORD WARMTH EARLY...NEAR RECORD COLD LATE...
...DESPITE HEAVY RAIN...FLOODING NOT A MAJOR PROBLEM...

APRIL TURNED OUT TO BE QUITE A WET MONTH ACROSS METRO DETROIT AND
SOUTHEAST LOWER MICHIGAN. IN FACT, DURING THE FIRST 3 WEEKS OF THE
MONTH, IT RAINED 18 DAYS AND ON A COUPLE OF THEM AROUND AN INCH OR
BETTER FELL. FIRST OFF, ON THE 9TH, 1.07 INCHES FELL IN HEAVY RAIN
AND SCATTERED THUNDERSTORMS. THEN ON THE 22ND-23RD, 1.68 INCHES WAS
DUMPED ON THE AREA.

THIS IS NOT TO SAY THE APRIL WAS "ALL WET" THERE WERE A COUPLE OF
STRETCHES OF NICE DRY WEATHER WITH PLENTY OF SUNSHINE AND REASONABLE
TEMPERATURES, MOST NOTABLY, THE LAST WEEK. SCATTERED FROST AND/OR
FREEZING TEMPERATURES; HOWEVER, COVERED THE AREA ON THE WEEKEND
(24-25TH).

DESPITE THE COOL AND RAW WEATHER DURING THE 3RD WEEK, WARMER THAN
NORMAL TEMPERATURES DOMINATED THE MONTH. IN FACT, NEAR THE START OF
APRIL, RECORD WARMTH OCCURRED WITH A HIGH OF 77 ON THE 3RD.

MAY 1999

 ...OVERALL...MILD AND DRIER THAN NORMAL WITH A FEW EXCEPTIONS...

AFTER A WET APRIL, THE WEATHER DRIED OUT DURING THE FIRST HALF OF
MAY. IN FACT, ONLY 0.16 INCH FELL AT DETROIT METRO AIRPORT DURING
THE FIRST HALF OF THE MONTH. EXAGGERATING THE DRY CONDITIONS, WARM
TEMPERATURES AVERAGED CLOSE TO 6 DEGREES ABOVE NORMAL.

LIKE SEVERAL MONTHS IN THE RECENT PAST, A NOTABLE CHANGE IN THE
WEATHER OCCURRED ABOUT MID MONTH. TEMPERATURES COOLED OFF TO AROUND
NORMAL OR BELOW AND ABOUT AN INCH AND A HALF OF RAIN FELL. A RATHER
NASTY FALL-LIKE PATTERN SET UP SHOP OVER THE REGION DURING THE FIRST
HALF OF THE 4TH WEEK (24-27TH) WHEN AN UNSEASONABLY COOL AND
INTENSE LOW PRESSURE AREA DOMINATED THE GREAT LAKES. A HIGH OF ONLY
58 ON THE 24TH WAS 15 DEGREES BELOW NORMAL AND IT WAS ACCOMPANIED BY
WIND CHILLS IN THE 20S AND 30S. SOME SCATTERED LIGHT FROST WAS
OBSERVED IN SUBURBAN AND RURAL AREAS THE MORNING OF THE 27TH AS LOWS
FELL INTO  THE 30S AND 40S.
 
SEVERE WEATHER EPISODES WERE QUITE LIMITED WITH THE MOST NOTABLE
BLOWING THROUGH SOUTHEAST LOWER MICHIGAN ON THE 17TH. DURING THAT
EVENING, STRONG TO SEVERE THUNDERSTORMS ROARED THROUGH THE AREA IN
ADVANCE OF A VIGOROUS COLD FRONT. THE STORMS WERE ACCOMPANIED BY
WINDS GUSTING 50 TO 70 MPH. WIDELY SCATTERED REPORTS OF TREES DOWN
AND POWER OUTAGES OCCURRED.

JUNE 1999

...A LITTLE BIT OF EVERYTHING... A WARM MONTH...HOT AND COOL PERIODS...
   RECORD LOW...DRY AND WET SPELLS...AND A FEW BOUTS OF SEVERE WEATHER...

THE WEATHER DURING JUNE 1999 WILL BE REMEMBERED AS QUITE VARIABLE
ACROSS SOUTHEAST LOWER MICHIGAN AND THE METRO DETROIT AREA. PERIODS
OF HOT, COOL, AND IN BETWEEN WEATHER PREVAILED THROUGHOUT THE MONTH.
DECIDEDLY WET AND DRY PERIODS ADDED TO THE MIX. AT THE START,
TEMPERATURES AVERAGED NEAR NORMAL DURING THE FIRST 5 DAYS OR SO, BUT
THE FIRST OF A FEW HOT SPELLS BEGAN ON THE 6TH. HIGH TEMPERATURES
ROSE INTO THE 90S EVERYDAY BUT ONE (87 ON THE 9TH) FROM THE 6TH TO
THE 12TH. WHILE THERE WERE NO RECORD HIGHS DURING THIS PERIOD (NOR
FOR THE MONTH FOR THAT MATTER). THE HEAT WAS ACCOMPANIED BY LITTLE,
IF ANY RAINFALL UNTIL THE 12TH.

AS A STRONG COLD FRONT GRADUALLY APPROACHED THE AREA LATE IN THE
WEEK ON THE 11TH-13TH, A COUPLE OF BOUTS OF SEVERE WEATHER TOOK
PLACE. A DOWNBURST OF VERY STRONG WIND AND EXTREMELY HEAVY RAIN
OCCURRED IN A FEW SEVERE THUNDERSTORMS OVER DETROIT'S IMMEDIATE
WESTERN/NORTHERN SUBURBS. SCATTERED LARGE TREES WERE EITHER UPROOTED
OR LOST LARGE LIMBS. ALONG WITH THE DOWNBURST OF WIND, TORRENTIAL
RAIN (LOCALLY 5.0 ") QUICKLY CREATED SMALL LAKES ON LOCAL ROADS.
SEVERE THUNDERSTORM AND FLASH FLOOD WARNINGS WERE ISSUED FOR THE
AREA.

THE FRONT HERALDED IN SOME IMPRESSIVELY COOL, BUT GENERALLY WELCOMED
WEATHER FOR MID JUNE. TEMPERATURES FAILED TO MAKE EVEN THE 70S FROM
THE 15TH-17TH. A COOL HIGH OF 65 AND A RECORD LOW (TIED) OF 46, MADE
THE 15TH THE COLDEST DAY OF THE MONTH (12 DEGREES BELOW NORMAL).
AFTER DAYS (14-19TH) OF BELOW NORMAL TEMPERATURES, THE COOL
CONDITIONS GRADUALLY WARMED AND CREATED SOME OF THE MOST DELIGHTFUL
WEATHER OF THE MONTH. WARM DAYS, COOL NIGHTS, AND RELATIVELY LOW
HUMIDITY WAS THE RULE WITH ANOTHER MAINLY DRY PERIOD SETTING UP SHOP
FROM THE 15TH-22ND.

AFTER ANOTHER ROUND OF HEAT AND HUMIDITY LATE IN THE MONTH
(23RD-28TH), STRONG TO SEVERE THUNDERSTORMS AND MORE TORRENTIAL RAIN
(2" TO 4"). THE ADDED RAIN LATE IN THE MONTH MADE IT THE 12TH
WETTEST JUNE ON RECORD IN DETROIT.
 
JULY 1999

...6TH WARMEST JULY/8TH WARMEST MONTH ON RECORD...
...SEVERE WEATHER EPISODES PICKED UP IN THE SECOND HALF OF THE MONTH...

OUR VERY WARM SUMMER CONTINUED RIGHT THROUGH JULY WITH TEMPERATURES
AVERAGING ABOVE NORMAL. THE AVERAGE TEMPERATURE OF 76.8 MADE THIS JULY
THE 6TH WARMEST JULY ON RECORD AND THE 8TH WARMEST MONTH EVER
REGISTERED IN DETROIT. EVEN THOUGH IT WAS HOT, NO RECORD HIGH
TEMPERATURES WERE ESTABLISHED FOR DETROIT.  WE SWEATED THROUGH EIGHT
90 DEGREE OR BETTER DAYS DURING JULY.  THE WORST OF THE HEAT CAME
DURING THE JULY 4TH WEEKEND AND AT THE END OF THE MONTH. THE
TEMPERATURE HIT 94 DEGREES THREE TIMES DURING THE MONTH ON THE 4TH,
30TH, AND 31ST. THE 31ST WAS THE MOST MISERABLE DAY OF THE LOT WITH
THE TEMPERATURE HITTING THE MID TO UPPER 90S, BUT WITH THE HUMIDITY,
IT FELT LIKE IT WAS BETWEEN A 100 AND 110.

SEVERE WEATHER WAS GENERALLY CONCENTRATED MORE IN THE LAST WEEK OR
SO. ON THE 23RD, NUMEROUS SEVERE WEATHER WARNINGS WERE ISSUED.
STRONG WINDS WITH GUSTS OF 50 TO 70 MPH DOMINATED THIS EVENT CAUSING
NUMEROUS DOWNED TREES ALONG WITH SCATTERED POWER OUTAGES. THEN ON
THE NEXT DAY (24TH), EVERE WEATHER IN THE FORM OF HAIL AND HIGH
WINDS WAS CONCENTRATED MORE IN THE NORTHERN SUBURBS OF DETROIT,
WHICH LEAD TO ADDITIONAL TREE AND POWER LINE DAMAGE. FINALLY, A
LINE OF SEVERE THUNDERSTORMS RIPPED THROUGH THE AREA LATE ON THE
31ST AS A STRONG COLD FRONT PLOWED INTO THE HOT STEAMY AIRMASS IN
PLACE. THE EVENT WAS AGAIN DOMINATED BY TREE AND POWER LINE DAMAGE
RESULTING FROM 50 TO 70 MPH WIND GUSTS.
 
AUGUST 1999

...FINALLY...A NEAR NORMAL MONTH TEMPERATURE-WISE...
...18TH WARMEST SUMMER ON RECORD...

AFTER SEVERAL MONTHS OF ABOVE NORMAL TEMPERATURES, AUGUST WAS THE
FIRST SO-CALLED NORMAL OR BELOW MONTH SINCE MARCH. ONLY ONE NINETY
DEGREE DAY WAS RECORDED DURING THE MONTH AND WHILE THERE WERE COOL
PERIODS DURING THE MONTH, NONE WERE EXCEPTIONALLY NOTABLE AND NO
RECORDS WERE SET; HOWEVER, THE SUMMER OF 1999 STILL MANAGED TO PLACE
18TH FOR WARMEST SINCE 1870.

PRECIPITATION WAS SPOTTY DUE TO THE MORE CONVECTIVE NATURE OF THE
RAINFALL PATTERN. THE HEAVIEST OF THE RAIN FELL ACROSS THE NORTHERN
SUBURBS, BUT EVEN SO, THAT WAS JUST SLIGHTLY ABOVE NORMAL. AUGUST
WAS ALSO UNUSUALLY BENIGN IN THE SEVERE WEATHER DEPARTMENT WITH NO
REAL NOTABLE OUTBREAK.

SEPTEMBER 1999
 
...MAINLY DRY AND MILD SEPTEMBER STARTS AND ENDS ON A WET NOTE...
...NICE WEEKENDS THROUGHOUT...

OVERALL, SEPTEMBER WAS QUITE PLEASANT ACROSS SOUTHEAST LOWER
MICHIGAN WITH TEMPERATURES AVERAGING 2.3 DEGREES ABOVE NORMAL. ONE
OF BIGGEST PLUSES ABOUT THE MONTH WAS THE VERY NICE WEEKENDS. NO
MEASURABLE RAIN FELL ANY OF THE WEEKENDS AND THE DAYS WERE FILLED
WITH PLENTY OF SUNSHINE. ON THE MORNING OF THE 22ND, SCATTERED LIGHT
FROST WAS OBSERVED IN SOME OF THE WEST AND NORTHERN SUBURBS.

THE BALANCE OF SEPTEMBER WAS ON THE DRY SIDE WITH MEASURABLE
RAINFALL EVENTS ONLY COMING ONCE A WEEK AND EVEN THEN, THEY WERE
MAINLY LIGHT. THE TWO GLARING EXCEPTIONS TO THE LIGHT RAINFALLS WERE
ON THE 6TH AND THE 28-29TH. OVER AN INCH AND A HALF (1.53) WAS
DUMPED AT METRO AIRPORT ON THE 6TH WHEN STORMS WITH VERY HEAVY RAIN
PUSHED THROUGH THE REGION. LATE IN THE MONTH (ON THE 28-30TH),
NEARLY AN INCH AND A QUARTER (1.24) FELL IN A MORE UNIFORM RAINFALL.
THESE TWO RAINFALLS ACCOUNTED FOR 2.77 OF THE 3.11 INCHES THAT FELL
IN SEPTEMBER.

OCTOBER 1999

...OCTOBER AVERAGED A BIT ON THE COOL SIDE...UNTIL THE LAST FOUR DAYS...
 
OCTOBER FOLLOWED SEPTEMBER'S LEAD WITH OVERALL, MAINLY PLEASANT
WEATHER CONDITIONS. THE FIRST WEEK STARTED OUT ON A COOL NOTE WITH
TEMPERATURES AVERAGING CLOSE TO SEVEN DEGREES BELOW NORMAL. IN FACT,
ON THE MORNING OF THE 7TH, TEMPERATURES FELL INTO THE UPPER 20S TO
MID 30S ACROSS THE AREA AND WERE ACCOMPANIED BY A MODERATE KILLING
FROST IN SOME SUBURBS. HOWEVER, BY THE SECOND WEEK, TEMPERATURES
REVERSED COURSE AND AVERAGED ABOVE NORMAL WITH READINGS FLIRTING
WITH 70 DEGREES ON THE 10TH AND AS HIGH AS 77 BY THE 16TH. FROM THEN
ON, UNTIL THE LAST FOUR DAYS OF THE MONTH, A PREDOMINATLY COOL
NORTHWESTERLY WIND FLOW KEPT A LID ON THE TEMPERATURES. FROM THE
28TH THROUGH HALLOWEEN, A BEAUTIFUL SURGE OF INDIAN SUMMER WEATHER
GRACED THE REGION. UNDER CONSIDERABLE SUNSHINE, DAYTIME HIGHS PUSHED
WELL INTO THE 70S AND TWO RECORD HIGHS WERE SET WITH 77 DEGREES ON
THE 29TH AND 76 ON THE 30TH.
 
ONLY ABOUT AN INCH AND A HALF (1.56) OF RAIN FELL, WHICH IS OVER A
HALF INCH (.54) BELOW THE AVERAGE SEEN IN OCTOBER (2.10). RAINFALL
WAS SCATTERED DURING THE FIRST HALF OF THE MONTH, BUT IT WAS ALMOST
NON-EXISTENT DURING THE SECOND HALF WITH ONLY .03 FALLING AFTER THE
13TH.

NOVEMBER 1999

...7TH WARMEST NOVEMBER ON RECORD...
...UNSEASONABLY MILD AND DRY NOVEMBER ENDS ON A COLD NOTE...

PERIODS OF DELIGHTFUL INDIAN SUMMER WEATHER CONTINUED INTO
NOVEMEBER. THE FREQUENT WARM SPELLS MADE THIS NOVEMBER THE 7TH
WARMEST ON RECORD IN DETROIT SINCE 1870. THE WARM SPELL OF LATE
OCTOBER CONTINUED INTO THE 1ST OF NOVEMBER WHEN THE MERCURY HIT A
HIGH OF 75, BUT STILL 6 DEGREES SHY OF THE RECORD OF 81.

WHEN A COLD BLAST ARRIVED LATE ON THE 2ND AND ON THE 3RD, THE HIGH
TEMPERATURE ONLY REACHED 40 DEGREES! THIS PRODUCED THE FIRST GENERAL
SNOW FLURRY ACTIVITY ACROSS THE REGION. THIS COLD BLAST WAS
SHORT LIVED WITH TEMPERATURES REBOUNDING NICELY AND BY EARLY THE
NEXT WEEK (9TH AND 10TH) WHEN RECORD HIGHS WERE SET. A 75 DEGREE
READING ON THE 9TH SMASHED THE OLD RECORD OF 69 SET BACK IN 1975.
NOT ONLY WAS THIS A RECORD FOR THE DAY, BUT IT WAS THE WARMEST
TEMPERATURE EVER SEEN SO LATE IN THE YEAR. THE HIGH OF 68 ON THE
10TH TIED THE OLD RECORD FIRST SET BACK IN 1949.

NEAR RECORD INDIAN SUMMER WARMTH PUSHED TEMPERATURES UP INTO THE
LOWER TO MID 60S ON THE 19TH, 22ND, 23RD, AND 24TH, THEN A COLD SNAP
ARRIVED THANKSGIVING WEEKEND.
 
NOVEMBER WAS ON THE DRY SIDE WITH ONLY 1.49 INCHES OF RAIN FALLING
WHICH WAS NEARLY AN INCH AND A QUARTER (1.18) BELOW NORMAL. A STRONG
LOW PRESSURE ON THE 2ND, DUMPED EIGHT TENTHS OF AN INCH OF RAIN AT
DETROIT METRO AIRPORT. AFTER THAT, RAINFALL WAS PRETTY SPARSE UNTIL
THE LAST WEEK. A STRONG COLD FRONT PUSHED A SQUALL OF SHOWERS
THROUGH THE REGION VERY EARLY ON THE 24TH. WIND GUSTS (MPH) IN THE
30S, 40S, AND 50S WERE NOTED ACROSS THE REGION.

OVERALL, THIS LA NINA FALL WAS VERY REMINISCENT OF THE NICE LA NINA
FALL EXPERIENCED JUST LAST YEAR. BOTH FALLS WERE WARMER AND DRIER
THAN ON AVERAGE, BUT LAST FALL WAS THE WARMER AND DRIER OF THE TWO.
DURING FALL 1998, THE TEMPERATURE AVERAGED 55.2 DEGREES (+3.6).
MEANWHILE THIS FALL, THE TEMPERATURE AVERAGED 54.1 DEGREES (+2.5).
LAST FALL'S RAINFALL WAS 4.20 INCHES (-3.46 INCHES) AND THIS FALL'S
RAINFALL TOTALED 6.16 INCHES (-1.50 INCHES).
 
DECEMBER 1999
 
          ...A RELATIVELY MILD AND DRY DECEMBER...

TEMPERATURES AVERAGED NEARLY FOUR (3.7) DEGREES ABOVE NORMAL.
DURING THE FIRST HALF OF THE MONTH, TEMPERATURES WERE EXCEPTIONALLY
MILD. THROUGH THE 16TH, READINGS AVERAGED A RELATIVELY BALMY
39 DEGREES WHICH IS NEARLY 11 DEGREES (10.7) ABOVE THE MONTHLY
NORMAL. IN SPITE OF THE MILD THE MILD WEATHER, NO RECORD HIGHS WERE
SET. A COLD SNAP THAT BEGAN THE WEEK BEFORE CHRISTMAS AND CONTINUED
BASICALLY UNTIL THE 30TH, SIGNIFICANTLY TRIMMED THE ABOVE NORMAL
TEMPERATURE DEPARTURE THAT HAD ACCUMULATED DURING THE MONTH.
HOWEVER, AS MONTH DREW TO A CLOSE, THE ABOVE NORMAL TEMPERATURE
REGIME RETURNED.

ALL IN ALL, THE WEATHER DURING DECEMBER WAS NOT THAT BAD. BESIDES
THE RELATIVELY MILD TEMPERATURES, BOTH RAIN AND SNOWFALL AVERAGED
SOMEWHAT BELOW NORMAL. IN FACT, MOST OF THE PRECIPITATION
(2.08 INCHES) FELL DURING THE FIRST THREE WEEKS OF THE MONTH.
STRONG LOW PRESSURE AREAS THAT TRACKED ACROSS THE NORTHERN GREAT
LAKES OR SOUTHERN CANADA; HOWEVER, DID KICK UP THE WIND FROM TIME TO
TIME, BRINGING SHOTS OF MILDER AND THEN COLDER AIR WITH EACH PASSAGE

---------------------------------------------------------------------

...1999 MONTHLY BREAKDOWN OF TEMPERATURES/PRECIPITATION/SNOWFALL
AT DETROIT METROPOLITAN AIRPORT...
 

1999 MONTHLY TEMPERATURES AT DETROIT METROPOLITAN AIRPORT

                                 AVERAGE                        DEPARTURE
 MONTH             TEMPERATURE                FROM NORMAL
 ----------             ------------------                -------------------
JANUARY            23.1 DEGREES                  +0.2 DEGREES
FEBRUARY          32.7 DEGREES                 +7.3 DEGREES (10TH WARMEST)
MARCH                34.8 DEGREES                 -0.9 DEGREES
APRIL                   50.7 DEGREES                 +3.4 DEGREES (17TH WARMEST)
MAY                     62.4 DEGREES                 +4.0 DEGREES (18TH WARMEST)
JUNE                    70.8 DEGREES                  +3.2 DEGREES (18TH WARMEST)
JULY                    76.8 DEGREES                  +4.5 DEGREES (6TH WARMEST)
AUGUST              70.2 DEGREES                 -0.3 DEGREES
SEPTEMBER       65.5 DEGREES                 +2.3 DEGREES
OCTOBER           51.6 DEGREES                 +0.4 DEGREES
NOVEMBER        45.2 DEGREES                 +5.0 DEGREES (7TH WARMEST)
DECEMBER         32.0 DEGREES                 +3.7 DEGREES
--------------        -----------------                ------------------
OVERALL            51.3 DEGREES                 +2.7 DEGREES (9TH WARMEST)
 

1999 MONTHLY PRECIPITATION AT DETROIT METROPOLITAN AIRPORT

                                  TOTAL                             DEPARTURE
MONTH             PRECIPITATION                FROM NORMAL
----------             -------------------                --------------------
JANUARY             3.00 INCHES                      +1.24 INCHES
FEBRUARY           1.98 INCHES                      +0.24 INCHES
MARCH                 1.12 INCHES                       -1.43 INCHES (8TH DRIEST)
APRIL                    5.13 INCHES                      +2.18 INCHES (7TH WETTEST)
MAY                      2.20 INCHES                       -0.72 INCHES
JUNE                     5.46 INCHES                       +1.85 INCHES (12TH WETTEST)
JULY                     3.62 INCHES                       +0.44 INCHES
AUGUST               1.31 INCHES                       -2.12 INCHES (20TH DRIEST)
SEPTEMBER        3.11 INCHES                      +0.22 INCHES
OCTOBER            1.56 INCHES                      -0.54 INCHES
NOVEMBER         1.49 INCHES                      -1.18 INCHES
DECEMBER          2.24 INCHES                      -0.58 INCHES
--------------         ----------------                     -----------------
OVERALL             32.22 INCHES                    -0.40 INCHES
 
 

1999 MONTHLY SNOWFALL AT DETROIT METROPOLITAN AIRPORT

                                   TOTAL                   DEPARTURE
MONTH                SNOWFALL            FROM NORMAL
----------                --------------            --------------------
JANUARY            27.3 INCHES            +17.3 INCHES (2ND SNOWIEST)
FEBRUARY           7.8 INCHES              -1.4 INCHES
MARCH               13.2 INCHES             +6.4 INCHES (16TH SNOWIEST)
APRIL                     0.0 INCHES             -1.7 INCHES
MAY                       0.0 INCHES             NORMAL
JUNE                       0.0 INCHES             NORMAL
JULY                       0.0 INCHES             NORMAL
AUGUST                 0.0 INCHES             NORMAL
SEPTEMBER           0.0 INCHES            NORMAL
OCTOBER               0.0 INCHES            NORMAL
NOVEMBER            TRACE                   -2.9 INCHES
DECEMBER            4.3 INCHES            -5.7 INCHES

DEEDLER/BOYNE


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