431
CXUS53 KARX 031413 RRA
CLMRST
CLIMATE REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
812 AM CST TUE NOV 3 2009
..OCTOBER AT ROCHESTER MN WAS THE 8TH COLDEST...2ND WETTEST
AND
THE SNOWIEST ON RECORD...
ROCHESTER RECEIVED 7.57 INCHES OF PRECIPITATION DURING THE MONTH OF
OCTOBER WHICH WAS 5.37 INCHES ABOVE NORMAL. ONLY THE 9.11 INCHES
RECORDED IN OCT 1911 HAS BEEN WETTER. THE GREATEST 24-HOUR
PRECIPITATION WAS 1.58 INCHES THAT FELL FROM THE 21ST TO THE 22ND.
THE AVERAGE TEMPERATURE FOR THE MONTH WAS 42.5 DEGREES...WHICH WAS
4.5 DEGREES BELOW NORMAL. THIS WAS THE EIGHTH COLDEST OCTOBER AND
THE COLDEST OCTOBER SINCE 2002 WHEN THE AVERAGE TEMPERATURE WAS 41.8
DEGREES. THE COLDEST OCTOBER OCCURRED BACK IN 1917 WHEN THE AVERAGE
TEMPERATURE WAS 37.9 DEGREES. THE AVERAGE HIGH WAS 50 DEGREES...
WHILE THE AVERAGE LOW WAS 35 DEGREES. THE HIGHEST TEMPERATURE WAS
68 DEGREES ON THE 19TH...WHILE THE COLDEST TEMPERATURE WAS
23 DEGREES ON THE 11TH.
SNOWFALL DURING THE MONTH THE MONTH TOTALED 7.9 INCHES...WHICH WAS
6.9 INCHES ABOVE NORMAL. THIS WAS THEIR SNOWIEST OCTOBER. THE OLD
RECORD WAS 6.6 INCHES IN 1929.
..RECORDS
OCTOBER...SNOWIEST OCTOBER - 7.9 INCHES...OLD RECORD 6.6 INCHES
IN 1929
OCT 29...DAILY RAINFALL OF 1.21 INCHES...OLD RECORD 0.71 IN 1971.
OCT 23...DAILY SNOWFALL 4.1 INCHES...OLD RECORD 1.0 IN 1917.
OCT 21...DAILY RAINFALL OF 1.57 INCHES...OLD RECORD 1.01 IN 1951.
OCT 15...DAILY LOW MAXIMUM HIGH OF 39 DEGREE...TIED RECORD IN 1943.
OCT 14...DAILY SNOWFALL OF 0.6 SNOWFALL...OLD RECORD WAS A TRACE IN
1986.
OCT 13...DAILY LOW MAXIMUM HIGH OF 35 DEGREES...OLD RECORD WAS 36 IN
2006.
OCT 12...DAILY SNOWFALL OF 1.7...OLD RECORD WAS 0.1 IN 2006.
OCT 12...DAILY LOW MAXIMUM HIGH OF 41...TIED RECORD SET IN 1959.
OCT 11...DAILY SNOWFALL OF 0.9...OLD RECORD WAS A TRACE IN 1977
OCT 2...DAILY RAINFALL OF 1.45...OLD RECORD WAS 0.83 IN 2004.
..DISCUSSION
A SERIES OF NORTHERN STREAM SYSTEMS KEPT TEMPERATURES WELL BELOW
NORMAL DURING THE MONTH...ESPECIALLY DURING THE FIRST HALF. IN FACT
THE FIRST DAY WITH A NORMAL TEMPERATURE DID NOT OCCUR UNTIL THE
18TH. ALONG WITH THE COLD TEMPERATURES WERE SEVERAL VERY WET SYSTEMS
THAT PASSED THROUGH THE AREA LEADING TO A SIGNIFICANT AMOUNT OF
PRECIPITATION. THE 7.57 INCHES OF PRECIPITATION THAT FELL RANKS
OCTOBER 2009 AS THE 2ND WETTEST ON RECORD. WHILE MANY AREAS TO
THE EAST OF ROCHESTER SAW THE PRECIPITATION MAINLY AS RAIN...THE
ROCHESTER AREA WAS ON THE COLD SIDE OF SEVERAL SYSTEMS LEADING TO A
RECORD 7.9 INCHES OF SNOWFALL.
...............................
..THE ROCHESTER CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2009
CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1886 TO 2009
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
............................................................
TEMPERATURE (F)
RECORD
HIGH 93 10/03/1997
LOW -6 10/25/1887
HIGHEST 68 10/19 MM MM 80 10/12
LOWEST 23 10/11 MM MM 23 10/28
AVG. MAXIMUM 49.8 56.9 -7.1 60.2
AVG. MINIMUM 35.3 37.1 -1.8 38.9
MEAN 42.5 47.0 -4.5 49.6
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 0 0.2 -0.2 0
DAYS MIN <= 32 12 10.4 1.6 6
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 9.11 1911
MINIMUM 0.01 1952
TOTALS 7.57 2.20 5.37 2.45
DAILY AVG. 0.24 0.07 0.17 0.08
DAYS >= .01 18 8.6 9.4 11
DAYS >= .10 12 4.8 7.2 4
DAYS >= .50 5 1.6 3.4 1
DAYS >= 1.00 4 0.3 3.7 1
GREATEST
24 HR. TOTAL 1.58 10/21 TO 10/22
SNOWFALL (INCHES)
RECORDS
TOTAL 10.0 1887
TOTALS 7.9 1.0 6.9 0.1
SINCE 7/1 7.9 1.0 6.9 0.1
SNOWDEPTH AVG. 0 MM MM 0
DAYS >= 1.0 2 0.2 1.8 0
GREATEST
SNOW DEPTH 1R 10/24 0 MM
10/14
10/12
24 HR TOTAL 4.2R MM
DEGREE_DAYS
HEATING TOTAL 688 558 130
SINCE 7/1 879 839 40
COOLING TOTAL 0 1 -1
SINCE 1/1 319 473 -154
.............................................................
WIND (MPH)
AVERAGE WIND SPEED 9.9
HIGHEST WIND SPEED/DIRECTION 33/110 DATE 10/01
HIGHEST GUST SPEED/DIRECTION 43/110 DATE 10/01
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
NUMBER OF DAYS FAIR 5
NUMBER OF DAYS PC 10
NUMBER OF DAYS CLOUDY 16
AVERAGE RH (PERCENT) 78
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 5
LIGHT RAIN 17 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 2
LIGHT SNOW 9 SLEET 0
FOG 22 FOG W/VIS <= 1/4 MILE 4
HAZE 4
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
TMS/BOYNE/DAS
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