July, 1997 Preliminary Local Climatological Data Rochester, MN National Weather Service |-Temperature-|--------Degree Days---------|-Precipitation-|-Snowfall-|----Wind----| (degrees F) (base 65 degrees F) (inches) (inches) (mph, deg) Heating Cooling Max Min Avg Dep HDD Seas Dep CDD Seas Dep Tot Tot Norm Tot Tot Avg Pk Dir from for for for for for Spd Gust at Norm Seas Seas Mon Mon Seas Pk Date | | | | | | | | | | | | | | | | | | 1 85 63 74 4 0 0 0 9 119 -15 T T 0.13 M M 12.1 30 170 2 76 59 68 -2 0 0 0 3 122 -17 T T 0.26 M M 22.7 44 270 3 63 53 58 -12 7 7 6 0 122 -23 0.01 0.01 0.39 M M 15.6 39 300 4 68 51 60 -10 5 12 10 0 122 -29 0.10 0.11 0.52 M M 11.3 23 290 5 74 48 61 -9 4 16 13 0 122 -35 0.07 0.18 0.65 M M 11.5 25 230 6 67 50 59 -12 6 22 18 0 122 -42 0 0.18 0.78 M M 7.6 17 10 7 70 44 57 -14 8 30 25 0 122 -49 0.17 0.35 0.92 M M 10.0 21 170 8 71 57 64 -7 1 31 25 0 122 -56 0.01 0.36 1.06 M M 9.5 20 10 9 70 52 61 -10 4 35 28 0 122 -63 0 0.36 1.20 M M 8.9 18 140 10 77 51 64 -7 1 36 28 0 122 -70 0 0.36 1.34 M M 11.8 26 170 11 82 62 72 1 0 36 27 7 129 -70 0 0.36 1.48 M M 13.8 25 160 12 84 68 76 5 0 36 26 11 140 -66 0.92 1.28 1.62 M M 14.7 29 180 13 83 68 76 5 0 36 25 11 151 -62 0.89 2.17 1.76 M M 11.4 39 260 14 76 62 69 -2 0 36 24 4 155 -65 0 2.17 1.90 M M 13.0 28 290 15 85 62 74 3 0 36 23 9 164 -63 0 2.17 2.04 M M 10.8 24 250 16 88 69 79 8 0 36 22 14 178 -56 0.19 2.36 2.18 M M 12.8 40 260 17 83 63 73 2 0 36 21 8 186 -55 0.88 3.24 2.32 M M 6.0 40 360 18 78 67 73 2 0 36 20 8 194 -54 0.76 4.00 2.46 M M 7.5 43 330 19 76 64 70 -2 0 36 20 5 199 -56 1.59 5.59 2.60 M M 12.7 26 160 20 84 65 75 3 0 36 20 10 209 -53 0.63 6.22 2.74 M M 5.9 25 230 21 80 66 73 2 0 36 20 8 217 -51 T 6.22 2.88 M M 6.6 17 120 22 68 62 65 -6 0 36 20 0 217 -57 0.83 7.05 3.02 M M 9.0 20 110 23 78 64 71 0 0 36 20 6 223 -57 0.40 7.45 3.16 M M 7.6 14 130 24 79 64 72 1 0 36 20 7 230 -56 0 7.45 3.29 M M 9.9 22 160 25 86 69 78 7 0 36 20 13 243 -49 1.27 8.72 3.42 M M 9.8 23 350 26 87 72 80 9 0 36 20 15 258 -40 0.01 8.73 3.55 M M 6.0 41 260 27 84 67 76 5 0 36 20 11 269 -35 0.27 9.00 3.68 M M 6.9 23 150 28 78 62 70 -1 0 36 20 5 274 -36 0 9.00 3.81 M M 9.7 18 10 29 73 58 66 -5 0 36 20 1 275 -41 0 9.00 3.94 M M 4.8 14 60 30 74 55 65 -6 0 36 20 0 275 -47 0 9.00 4.07 M M 3.9 11 220 31 75 50 63 -8 2 38 22 0 275 -53 0.01 9.01 4.20 M M 8.5 20 190 JUL CLIMATOLOGICAL REPORT FOR ROCHESTER MN ...JULY WAS A WET MONTH AND A LITTLE COOLER THAN NORMAL... THE FIRST DAY OF JULY WAS A TYPICAL JULY AFTERNOON AS TEMPERATURES ROSE TO 85 DEGREES. BUT THE WARM WEATHER LASTED BARELY 24 HOURS AS UNSEASONABLY CHILLY AIR SWEPT INTO THE MIDWEST. FROM THE 2ND THROUGH THE 10TH THE MERCURY DID NOT REACH THE 80 DEGREE MARK. IN FACT THE MERCURY FELL TO 44 DEGREES ON THE MORNING OF THE 7TH COMING CLOSE TO THE RECORD LOW OF 43 ESTABLISHED IN 1934. IT WAS MILD FROM THE 11TH THROUGH THE 28TH AS TEMPERATURES REACHED THE 85 DEGREE MARK ONLY FOUR TIMES, ON THE 15TH AND 16TH AND AGAIN ON THE 25TH AND 26TH. ON MOST DAYS TEMPERATURES WERE IN THE UPPER 70S TO LOW 80S. THE END OF THE MONTH MARKED THE ARRIVAL OF ANOTHER BATCH OF CHILLY AIR AS TEMPERATURES FELL BACK INTO THE LOW TO MID 70S. RAIN FELL FREQUENTLY IN JULY. THROUGH THE 27TH OF THE MONTH THERE HAD BEEN ONLY 7 DAYS WITHOUT RAIN...THE LONGEST DRY PERIOD WAS FROM 9 THROUGH 12 JULY. THE ONLY BESSING WAS TIMING...AS MOST OF THE PRECIPITATION CAME FROM NIGHT TIME AND EARLY MORNING THUNDERSTORMS. A TOTAL OF 9.01 INCHES OF RAIN FELL...THE 4TH HIGHEST PRECIPITATION TOTAL FOR THE MONTH OF JULY...THE 9TH HIGHEST MONTHLY PRECIPITATION ON RECORD. THERE WERE 7 DAYS WITH .8 INCHES OR MORE, TWO DAYS WITH AN INCH OR MORE, 1.27 INCHES ON THE 25TH AND 1.59 INCHES ON THE 19TH. TEMPERATURE DATA...... (DEGREES F) AVERAGE MONTHLY TEMPERATURE.... 68.9 OR 2.0 DEGREES BELOW NORMAL AVERAGE MAXIMUM TEMPERATURE.... 77.5 AVERAGE MINIMUM TEMPERATURE.... 60.2 HIGHEST TEMPERATURE WAS 88 ON DAY 16 LOWEST TEMPERATURE WAS 44 ON DAY 7 HEATING DEGREE DAYS (BASE 65) COOLING DEGREE DAYS MONTHLY TOTAL ........... 38 MONTHLY TOTAL .......... 165 DEPARTURE FROM NORMAL.... 22 DEPARTURE FROM NORMAL... -34 SEASONAL TOTAL (JUL-JUN). 38 SEASONAL TOTAL (JAN-DEC) 275 DEPARTURE FROM NORMAL.... 22 DEPARTURE FROM NORMAL... -53 PRECIPITATION DATA.... ..RAIN.. TOTAL FOR THE MONTH......... 9.01 OR 4.81 INCHES ABOVE NORMAL TOTAL SINCE JANUARY 1ST..... 21.18 OR 3.83 INCHES ABOVE NORMAL GREATEST 24 HOUR RAINFALL WAS 1.59 INCHES ON DAY(S) 19 ..SNOW.. TOTAL FOR THE MONTH......... 0.0 TOTAL FOR THE SEASON........ T GREATEST 24 HOUR SNOWFALL WAS INCHES ON DAY(S) __ __ ..NUMBER OF DAYS.. WITH .01 INCHES OR MORE 18 HIGHS 32 DEGREES OR COLDER 0 WITH .10 INCHES OR MORE 13 HIGHS 90 DEGREES OR WARMER 0 WITH .50 INCHES OR MORE 8 LOWS 32 DEGREES OR COLDER 0 WITH 1.00 INCHES OR MORE 2 LOWS 0 DEGREES OR COLDER 0 SEA LEVEL PRESSURE............ HIGHEST 30.43 INCHES ON DAY 30 LOWEST 29.53 INCHES ON DAY 02 WIND DATA............. THE AVERAGE MONTHLY WIND SPEED WAS 10.1 MPH THE FASTEST TWO-MINUTE WIND WAS... 38 MPH FROM 330 DEGREES THE HIGHEST PEAK WIND GUST WAS.... 44 FROM 270 DEGREES