BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MARCH 12, 2007  ALL TIMES ARE IN EASTERN STANDARD TIME   ANOTHER VERY MILD DAY WITH TEMPERATURES INTO THE 50'S   Increasing high clouds are becoming thicker by early afternoon, but very mild temperatures heading well into the 50's will mean today will average at least 8 degrees on the warm side. This will mean the month now at 5 degrees below normal will become around 4 degrees colder than normal after today. The air is very dry today with relative humidities into the 20% to 30% range.   Today's observations:   7 A.M.   Weather: Thin scattered cirrus Temperature: 32F, Dew point: 23F, Wind: WSW at 09 kts Wind remark: gradually backing past hour Sea-level pressure: 30.27 inches Hg, rising Visibility: 65 miles, 75 miles NW 6-hour min. temp. 31 deg. BHO SA 1155 220 –SCT 250 –SCT 65 251/32/23/2509/027/ SML PTCH ACSL DSNT NNW PTCHS DENSE CI/CC DSNT NW-NE VSBY NW 75 WND GRDLY BACKING/ 8/042 51016 10034 20031   10 A.M.   Weather: High thin overcast cirrus, breaks E-S  Temperature: 46F, Dew point: 22F, Wind: SSW at 06 kts Sea-level pressure: 30.26 inches Hg, falling Visibility: 60 miles, 70 miles NW  BHO SA 1455 250 –SCT 300 –OVC 60 247/46/22/2006/026/ BINOVC DSNT E-S THN K LYR ALG HRZN SW-NW-NE VSBY NW 70/ 8/001 58004   1 P.M.   Weather: High cirrus overcast with thin spots Temperature: 54F, Dew point: 19F, Wind: SSW at 09 kts Wind: variability S to WSW Sea-level pressure: 30.20 inches Hg, falling Visibility: 70 miles   BHO SA 1755 200 SCT E220 BKN 250 OVC 70 228/54/19/2109/020/ DENSE CI ALQDS OVC PTLY THN PARTIAL HALO WND 18V24/ 8/002 58019 10054 20032   WEATHER SUMMARY FOR SUNDAY, MARCH 11   TEMPERATURE (DEGREES F) MAX.....51    NORMAL.....43 MIN.....33    NORMAL.....26 MEAN....42    NORMAL.....35                        DEPARTURE FROM 30-YEAR NORMAL.........+ 7 TOTAL DEPARTURE FOR THE MONTH.........-54 (-5.1 DEGREES/DAY)   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........23   DEPARTURE.......- 7 TOTAL HEATING UNITS FOR THE MONTH.........404   DEPARTURE.......+52 TOTAL HEATING UNITS FOR THE SEASON.......4495   DEPARTURE......-427 TOTAL HEATING UNITS LAST SEASON TO DATE..4443   DIFFERENCE......+52   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............32 W   AT  5:13 P.M.                          AEROVANE.............31 W   AT  5:13 P.M.                          ASOS.................N/A                           DAVIS................32 W   AT  N/A         FASTEST MILE FOR YESTERDAY..............24 S   AT 12:23 A.M.   MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A   MAXIMUM 1-MINUTE DAVIS AVERAGE..........24 WNW AT 1:26 P.M.   AVERAGE WIND SPEED AND DIRECTION........15.0 WNW                     ASOS................15.0                         DAVIS.............  14.9 W [270 deg]    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.....-0.15                          ASOS..............0.26 TOTAL PRECIPITATION FOR THE MONTH..........2.00  DEPARTURE.....+0.20                           ASOS..............2.01    TOTAL PRECIPITATION FOR THE YEAR...........7.72  DEPARTURE.....-2.92                          ASOS..............7.64  [corrected]   SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.4 TOTAL SNOWFALL FOR THE MONTH................0.4  DEPARTURE......-4.6  TOTAL SNOWFALL FOR THE SEASON..............14.3  DEPARTURE.....-36.1        PRELIMINARY CLIMATE SUMMARY FOR MARCH 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST   AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available   3/1  40/22/31/-1/0/0/512/76          24 NW   Aero 23 MPH NW 3/2  49/28/39/+7/1.74/0.4/000/00     48 E    Aero 45 MPH E 3/3  58/33/46/+14/0/0/489/72         44 WNW  Aero 43 MPH WNW 3/4  40/26/33/0/0/0/471/69           37 W 3/5  37/19/28/-5/T/T/198/29          58 W    Aero 57 MPH W 3/6  19/3/11/-22/0/0/667/97 *        57 W    Aero 61 MPH W 3/7  22/2/12/-21/0/0/504/73          28 SW    3/8  25/5/15/-19/T/T/471/68          51 WNW  Aero 54 MPH WNW 3/9  34/1/18/-16/0/0/668/96 *        25 S     3/10 49/22/36/+2/0/0/322/46          39 S    Aero 39 MPH S 3/11 51/33/42/+7/0.26/0/513/73       32 W      3/12 morning low temp. 31 deg; normal now 27 deg.    * Record low maximum temperature of 19 on the 6th surpasses previous 21 set   in 1916. * Record low minimum temperature of 3 on the 6th ties previous 3 set in 1948. * Record low minimum temperature of 1 on the 9th breaks previous 5 set in   1885, 1943, and 1996.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR MARCH 12 HIGH 67 IN 1977 LOW 2 IN 1885 PRECIP 2.87 INS. IN 1888 SNOWFALL 9.7 INS. IN 1959 PEAK GUST 66 MPH SE IN 1962   RECORDS FOR MARCH 13 HIGH 72 IN 1990 LOW -1 IN 1885 PRECIP 2.47 INS. IN 1993 SNOWFALL 10.0 INS. IN 1993 PEAK GUST 76 MPH ENE IN 1993 [THE "STORM OF THE CENTURY"]   TODAY'S REPORT By: Robert Skilling