December, 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 33 31 32 8 33 1888 111 0 399 -73 0 0 0.04 0.0 3.9 8.2 18 190 2 34 32 33 10 32 1920 101 0 399 -73 T T 0.08 T 3.9 7.8 16 170 3 32 24 28 5 37 1957 96 0 399 -73 0.08 0.08 0.12 0.5 4.4 10.4 22 320 5 24 14 19 -3 46 2045 98 0 399 -73 T 0.08 0.20 T 4.6 19.5 30 320 6 27 23 25 4 40 2085 94 0 399 -73 T 0.08 0.24 T 4.8 17.3 32 330 7 27 16 22 1 43 2128 93 0 399 -73 0 0.08 0.28 0 4.8 6.9 14 170 8 26 21 24 4 41 2169 89 0 399 -73 T 0.08 0.32 0.4 5.2 9.0 20 190 9 29 24 27 7 38 2207 82 0 399 -73 T 0.08 0.36 1.1 6.3 10.7 21 10 10 34 28 31 12 34 2241 70 0 399 -73 T 0.08 0.40 0.2 6.5 14.0 23 10 11 28 20 24 5 41 2282 65 0 399 -73 T 0.08 0.43 T 6.5 10.4 18 330 14 33 17 25 8 40 2403 44 0 399 -73 0 0.08 0.52 0 6.5 12.9 26 220 15 39 27 33 16 32 2435 28 0 399 -73 0 0.08 0.55 0 6.5 19.5 30 220 16 40 26 33 16 32 2467 12 0 399 -73 0 0.08 0.58 0 6.5 10.8 24 220 17 37 21 29 13 36 2503 -1 0 399 -73 0 0.25 0.61 0.0 6.5 12.9 26 200 18 40 28 34 18 31 2534 -19 0 399 -73 0 0.25 0.64 0.0 6.5 9.6 18 200 19 35 26 31 15 34 2568 -34 0 399 -73 T 0.25 0.67 T 6.5 11.2 28 330 20 31 17 24 9 41 2609 -43 0 399 -73 0 0.25 0.70 0.0 6.5 8.2 24 340 21 26 15 21 6 44 2653 -49 0 399 -73 0 0.25 0.73 0.0 6.5 11.2 23 160 22 30 22 26 11 39 2692 -60 0 399 -73 0 0.25 0.76 0 6.5 7.1 13 290 23 29 22 26 12 39 2731 -72 0 399 -73 0 0.25 0.79 0 6.5 8.7 20 180 24 24 21 23 9 42 2773 -81 0 399 -73 0 0.25 0.82 0 6.5 9.8 21 10 25 28 19 24 10 41 2814 -91 0 399 -73 0 0.25 0.85 0 6.5 11.5 23 340 26 35 14 25 12 40 2854 -103 0 399 -73 T 0.25 0.88 0.1 6.6 15.0 29 310 27 27 7 17 4 48 2902 -107 0 399 -73 0 0.25 0.91 0 6.6 12.5 29 160 28 30 21 26 13 39 2941 -120 0 399 -73 0.05 0.30 0.94 0.8 7.4 12.5 25 330 29 24 16 20 7 45 2986 -127 0 399 -73 T 0.30 0.97 T 7.4 10.1 21 10 30 26 9 18 5 47 3033 -132 0 399 -73 0.08 0.38 1.00 0.8 8.2 13.1 32 330 31 18 -2 8 -4 57 3090 -128 0 399 -73 0 0.38 1.03 0 8.2 13.4 34 180 DEC CLIMATOLOGICAL REPORT FOR ROCHESTER MN DECEMBER OF 1997 CLOSED OUT THE YEAR IN ROCHESTER ON A VERY MILD AND DRY NOTE. THE MEAN MONTHLY TEMPERATURE OF 25.0 DEGREES MADE THIS THE 10TH WARMEST DECEMBER IN RECORDED ROCHESTER WEATHER HISTORY. THE WARMEST DECEMBER WAS BACK IN 1931 WHEN THE AVERAGE TEMPERATURE WAS 30.6 DEGREES. NIGHTTIME TEMPERATURES WERE ESPECIALLY MILD THIS PAST DECEMBER WITH AN AVERAGE LOW OF 19.9 DEGREES WHICH IS MORE THAN 10 DEGREES WARMER THAN THE NORMAL LOW OF 9.4 DEGREES. ONLY 3 NIGHTS HAD LOWS COLDER THAN 10 DEGREES WITH ONLY ONE SUB-ZERO NIGHT ON THE MORNING OF THE 31ST. 29 OF THE 31 DAYS IN DECEMBER HAD ABOVE NORMAL TEMPERATURES WITH ONLY THE 5TH AND 31ST BEING COLDER THAN NORMAL. TOTAL PRECIPITATION AND SNOWFALL FOR THE MONTH WERE ONLY ABOUT A THIRD OF THE NORMAL AMOUNTS. ONLY ONE DAY HAD A SNOWFALL OF AN INCH OR MORE AND THERE WAS NEVER MORE THAN AN INCH OF SNOW ON THE GROUND. LOOKING AHEAD TO JANUARY... AVERAGE TEMPERATURE 11.5 DEGREES AVERAGE HIGH........20.2 DEGREES AVERAGE LOW......... 2.6 DEGREES AVERAGE PRECIPITATION 0.78 INCHES AVERAGE SNOWFALL 10.5 INCHES DECEMBER TEMPERATURE DATA...... (DEGREES F) AVERAGE MONTHLY TEMPERATURE.... 25.0 OR 7.8 DEGREES ABOVE NORMAL AVERAGE MAXIMUM TEMPERATURE.... 30.1 AVERAGE MINIMUM TEMPERATURE.... 19.9 HIGHEST TEMPERATURE WAS 40 ON DAY 18 LOWEST TEMPERATURE WAS -2 ON DAY 31 HEATING DEGREE DAYS BASE 65) MONTHLY TOTAL ........... 1235 DEPARTURE FROM NORMAL.... -247 SEASONAL TOTAL (JUL-JUN) 3090 DEPARTURE FROM NORMAL.... -128 PRECIPITATION DATA.... ..RAIN.. TOTAL FOR THE MONTH......... 0.38 OR 0.65 INCHES BELOW NORMAL TOTAL SINCE JANUARY 1ST..... 29.65 OR 0.01 INCHES BELOW NORMAL GREATEST 24 HOUR RAINFALL WAS 0.08 INCHES ON THE 3RD. ..SNOW.. TOTAL FOR THE MONTH......... 4.3 TOTAL FOR THE SEASON........ 8.2 GREATEST 24 HOUR SNOWFALL WAS 1 INCHE ON THE 9TH ..NUMBER OF DAYS.. WITH .01 INCHES OR MORE 1 HIGHS 32 DEGREES OR COLDER 20 WITH .10 INCHES OR MORE 0 HIGHS 90 DEGREES OR WARMER 0 WITH .50 INCHES OR MORE 0 LOWS 32 DEGREES OR COLDER 31 WITH 1.00 INCHES OR MORE 0 LOWS 0 DEGREES OR COLDER 1 SEA LEVEL PRESSURE............ HIGHEST 30.40 INCHES ON DAY 31 LOWEST 29.59 INCHES ON DAY 30 WIND DATA............. THE AVERAGE MONTHLY WIND SPEED WAS 11.7 MPH THE FASTEST TWO-MINUTE WIND WAS... 28 MPH FROM 190 DEGREES THE HIGHEST PEAK WIND GUST WAS.... 34 FROM 180 DEGREES