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ANNUAL CLIMATIC SUMMARY FOR HAVRE...CORRECTION
NATIONAL WEATHER SERVICE GREAT FALLS MT
1113 PM MST SAT JAN 1 2000 

ANNUAL WEATHER SUMMARY FOR HAVRE, 1999
 
MONTH  HIGH LOW AVG   DEP  PRECIP   DEP   SNOW  DEP   HDD   CDD
                      NOR  LIQUID         FALL         
 
JAN    45   -13 18.3   4.0  0.52    -0.03  8.9  +0.7  1442    0
FEB    58     5 33.3  12.2  0.55     0.19  7.0  +1.3   884    0
MAR    77    10 37.7   6.6  0.27    -0.39  3.7  -3.8   841    0
APR    76    16 42.7  -1.1  1.52    +0.83   .T  -6.9   660    0
MAY    89    25 52.5  -2.2  1.80    +0.14  2.3  +0.8   389    9
JUN    87    36 60.1  -3.6  2.91    +1.15  0.0   0.0   153   12
JUL   102    39 65.5  -4.2  0.39    -1.01  0.0   0.0    85  108
AUG   100    44 69.5  -0.1  0.98    -0.25  0.0   0.0    17  162
SEP    89    29 50.8  -5.8  1.21    +0.03  0.0  -0.4   333   10
OCT    77    13 45.9   0.1  0.86    +0.33   MM         586    0
NOV    78    13 38.2   8.5  0.35    -0.03   MM         799    0
DEC    56     9 32.4 +15.0  0.02    -0.40   MM        1002    0
YEAR  102   -13 45.6  +2.6 11.38    +0.52             7191  292
                                                     -1179 -128
 
THE MEAN YEARLY TEMPERATURE WAS THE 6TH WARMEST SINCE RECORDS BEGAN IN
1893.
 

THE FIRST THREE MONTHS OF THE YEAR WAS WARMER AND DRIER THEN NORMAL AS A
BROAD UPPER LEVEL RIDGE DOMINATED THE WEATHER OVER THE WESTERN UNITED
STATES.
 
FEBRUARY WAS THE 5TH WARMEST FEBRUARY ON RECORD.
 
MARCH WAS DRIER AND WARMER THAN USUAL. ONE-HALF OF THE MONTHS
PRECIPITATION FELL ON THE LAST DAY, BUT WITH ONLY ABOUT 0.4 INCHES OF
PRECIPITATION FOR THE MONTH. WITH A FAIRLY PERSISTENT HIGH PRESSURE
RIDGE OVER MONTANA DURING THE MONTH...TEMPERATURES WERE ALMOST 7 DEGREES
ABOVE NORMAL.
COOL CONDITIONS PREVAILED DURING THE MONTH OF MAY. TEMPERATURES WERE AN
AVERAGE OF 2.2 DEGREES BELOW NORMAL. 

COOL AND MOIST CONDITIONS WERE PREVALENT IN THE HAVRE AREA DURING  JUNE. 
TEMPERATURES WERE 3.6 DEGREES BELOW NORMAL FOR THE MONTH.
COOL...DRY CONDITIONS WERE OBSERVED AT HAVRE THIS MONTH. ONE RECORD HIGH 
TEMPERATURE WAS SET ON THE 20TH.  A SERIES OF COLD CANADIAN AIRMASSES MOVED 
INTO MONTANA. THIS RESULTED INTO JULY OF 1999 AS BEING THE FOURTH COLDEST JULY 
ON RECORD. ONLY 28 PERCENT OF THE NORMAL PRECIPITATION EXPECTED FOR JULY WAS 
RECORDED. 
OVERALL...AUGUST TURNED OUT TO BE A NEAR NORMAL MONTH IN TERMS OF
PRECIPITATION AND TEMPERATURES. ONE RECORD HIGH TEMPERATURE WAS SET ON
THE 30TH WITH AN AFTERNOON HIGH OF 100 DEGREES.

FOR SEPTEMBER...DURING THE FIRST FEW DAYS OF THE MONTH...A LARGE UPPER
LEVEL LOW PRESSURE SYSTEM ENTERED MONTANA FROM THE WEST AS A COLD
CANADIAN AIRMASS SETTLED OVER EASTERN MONTANA. MOISTURE ASSOCIATED WITH
THESE FEATURES RESULTED IN NEAR NORMAL PRECIPITATION FOR THE MONTH. THE
MONTH ALSO STARTED OFF WITH UNSEASONABLY COOL TEMPERATURES. THERE WERE
SOME COLD SPELLS...AS WELL AS SOME VERY WARM PERIODS DURING THE
MONTH...BUT THE COOL AIR PREVAILED. HAVRE HAD AN AVERAGE TEMPERATURE 
DEPARTURE OF 5.8 DEGREES BELOW NORMAL.
OCTOBER WAS GENERALLY COOLER AND DRIER THAN NORMAL. ONLY ONE-THIRD OF AN
INCH OF PRECIPITATION FELL. IT WAS QUITE WINDY ON THE 31ST, WITH A PEAK
WIND GUST OF 69 MPH.
A FAIRLY PERSISTENT UPPER LEVEL RIDGE OF HIGH PRESSURE DOMINATED THE
WEATHER PATTERN OVER MONTANA FOR MUCH OF NOVEMBER. THIS RESULTED IN
TEMPERATURES WELL ABOVE NORMAL FOR THE MONTH...ALONG WITH BELOW NORMAL
PRECIPITATION AMOUNTS. IN FACT...THE AVERAGE TEMPERATURE WAS ALMOST 9
DEGREES WARMER THAN NORMAL. TWO RECORD HIGH TEMPERATURES WERE RECORDED
DURING THE MONTH...78 ON THE 12TH...AND 71 ON THE 14TH. THE RECORD HIGH
OF 78 ON THE 12TH TIED THE ALL TIME RECORD HIGH TEMPERATURE FOR THE
MONTH OF NOVEMBER...PREVIOUSLY RECORDED IN 1975. MEASURABLE
PRECIPITATION WAS ONLY REPORTED ON THREE DAYS...THE 13TH...THE
21TH...AND THE 26TH. 

A VERY DRY AND MILD MONTH OCCURRED DURING THE MONTH OF DECEMBER...AS AN
UPPER LEVEL RIDGE OF HIGH PRESSURE CONTINUED TO DOMINATE THE WEATHER
OVER ALL OF NORTH CENTRAL MONTANA. AS A RESULT IT WAS THE 2ND WARMEST
DECEMBER ON RECORD...ALONG WITH THE 2ND DRIEST AS WELL. 
 

 

 




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