BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, MARCH 20, 2007  ALL TIMES ARE IN EASTERN STANDARD TIME   Today's observations:   7 A.M.   Weather: Broken stratocumulus Temperature: 37F, Dew point: 33F, Wind: SW at 13 kt Sea-level pressure: 30.05 inches Hg, rising Visibility: 20 miles 6-hour min. temp. 35F 6-hour precipitation: 0.01 inches 24-hour precipitation: 0.18 inches 24-hour snowfall: 1.0 inch Snow on ground: 4 inches BHO SA 1155 E40 BKN 20 176/37/13/2213/005/ TOTAL NEW SNW PST 24 HRS 1.0 INS/ 8/500 4/004 53025 MANUAL 6001/ ASOS 60001 MANUAL 70018 ASOS 70018 10037 20035   10 A.M.   Weather: Clear, few stratocumulus Temperature: 40F, Dew point: 18F, Wind: W at 18G30 kt  Peak wind: 40 kts WSW at 9:57 A.M. Sea-level pressure: 30.11 inches Hg, rising Visibility: 75 miles BHO SA 1455 CLR 75 198/40/18/2718G30/011/ FEW SC ALQDS PK WND 2540/1357/ 8/500 53022   1 P.M.   Weather: Clear, few cumulus Temperature: 41F, Dew point: 15F, Wind: W at 19G35 kt  Peak wind: 38 kts W at 12:38 P.M. Sea-level pressure: 30.19 inches Hg, rising Visibility: 75 miles BHO SA 1755 CLR 75 222/41/15/2619G35/019/ FEW CU PK WND 2838/38/ 8/100 51024 10042 20037   WEATHER SUMMARY FOR MONDAY, MARCH 19   TEMPERATURE (DEGREES F) MAX.....40    NORMAL.....46 MIN.....22    NORMAL.....29 MEAN....31    NORMAL.....37   DEPARTURE FROM 30-YEAR NORMAL...........-6 TOTAL DEPARTURE FOR THE MONTH..........-37 (-2.1 DEGREES/DAY)   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........34   DEPARTURE........+6 TOTAL HEATING UNITS FOR THE MONTH.........618   DEPARTURE.......+34 TOTAL HEATING UNITS FOR THE SEASON.......4709   DEPARTURE......-445 TOTAL HEATING UNITS LAST SEASON TO DATE..4666   DIFFERENCE......+43   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............38 S   AT 10:17 P.M.                            AEROVANE.............37 S   AT 10:19 P.M.                          ASOS.................37 S   AT 10:19 P.M.                          DAVIS................39 S   AT  5:16 P.M.         FASTEST MILE FOR YESTERDAY..............30 S   AT 10:18 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........30 S   AT 11:36 P.M.    MAXIMUM 2-MINUTE DAVIS AVERAGE..........30 S   AT  5:37 P.M.    AVERAGE WIND SPEED AND DIRECTION........17.5 WSW                     ASOS................17.4                         DAVIS...............16.3 SW  [217 deg]    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.18  DEPARTURE.....+0.02                          ASOS..............0.18 TOTAL PRECIPITATION FOR THE MONTH..........5.42  DEPARTURE.....+2.36                           ASOS..............5.40    TOTAL PRECIPITATION FOR THE YEAR..........11.14  DEPARTURE.....-0.76                          ASOS.............11.03     SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........1.0  DEPARTURE......+0.6 TOTAL SNOWFALL FOR THE MONTH................9.9  DEPARTURE......+1.7  TOTAL SNOWFALL FOR THE SEASON..............23.8  DEPARTURE.....-29.8        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 55/31/43/+8/0/0/423/60          24 SSW 3/13 60/36/48/+13/0/0/319/45         35 S    Aero 33 MPH S 3/14 66/42/54/+18/0/0/405/57         36 S 3/15 54/35/45/+9/0.07/0/000/00       36 NW 3/16 35/24/30/-6/1.65/8.5/000/00     55 NE   Aero 53 MPH NE 3/17 34/24/29/-6/1.52/T/000/00       51 NNE  Aero 50 MPH NE 3/18 31/20/26/-11/0/0/258/37         43 W    Aero 42 MPH W 3/19 40/22/31/-6/0.18/1.0/442/61     38 S    Aero 37 MPH S   3/20 morning low temp. 35 degrees; normal low now 29   * 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 20 HIGH 79 IN 1945 LOW 4 IN 1885 PRECIP 1.39 INS. IN 1957 SNOWFALL 11.4 INS. IN 1957 PEAK GUST 63 MPH SE IN 1975   RECORDS FOR MARCH 21 HIGH 81 IN 1921 LOW 2 IN 1885 PRECIP 2.67 INS. IN 1974 SNOWFALL 10.6 INS. IN 1958 PEAK GUST 72 MPH NE IN 1958   TODAY'S REPORT By: Stephanie Radner