BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MARCH 11, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME EASTERN DAYLIGHT TIME BEGAN AT 2 A.M. EST VERY MILD TEMPERATURES WITH LIGHT RAIN OVERNIGHT Eastern Daylight Time began at 2 A.M. when it became 3 A.M. this morning. However, the observations and times of various occurrences will continue to be reported on Standard Time in these daily climate summaries, since the Observatory operates on Standard Time throughout the year. If we use Daylight Time in any discussions we'll specify "EDT" here. Temperatures remained in the 40's last night after reaching a maximum of 49 degrees during the afternoon yesterday. Actually, the temperature rose from a record low of 1 above zero on Friday morning to 49 degrees Saturday afternoon--a rise of 48 degrees in about 30 hours! The rainfall overnight occurred all on today's date and was 0.26 inch. Today's observations: 7 A.M. Weather: Overcast with clearing line WSW-NNW approaching Temperature: 41F, Dew point: 40F, Wind: W at 9 kts Sea-level pressure: 30.09 inches Hg, rising Visibility: 15 miles, 25 miles W-NW, light fog all directions 6-hour min. temp. 41 deg. 6-hour rainfall: 0.26 in. BHO SA 1155 E36 OVC 15 191/41/40/2709/009/ BINOVC/LINE OF CLRG ADVCNG E XTDNG WSW-NNW VSBY W-NW 25 THN F ALQDS/ 8/02/ 53015 MANUAL 6026/ ASOS 60026 MANUAL 70026 ASOS 70026 10045 20041 10 A.M. Weather: Clear Temperature: 46F, Dew point: 30F, Wind: WNW at 13G24 kts Wind: variability WSW to NW Sea-level pressure: 30.11 inches Hg, rising Visibility: 25 miles, hazy BHO SA 1455 CLR 25 198/46/30/2913G24/011/ HAZY/ WND 25V31 51007 WEATHER SUMMARY FOR SATURDAY, MARCH 10 TEMPERATURE (DEGREES F) MAX.....49 NORMAL.....43 MIN.....22 NORMAL.....26 MEAN....36 NORMAL.....34 DEPARTURE FROM 30-YEAR NORMAL.........+ 2 TOTAL DEPARTURE FOR THE MONTH.........-61 (-6.3 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........29 DEPARTURE.......- 2 TOTAL HEATING UNITS FOR THE MONTH.........381 DEPARTURE.......+59 TOTAL HEATING UNITS FOR THE SEASON.......4472 DEPARTURE......-420 TOTAL HEATING UNITS LAST SEASON TO DATE..4426 DIFFERENCE......+46 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............39 S AT 5:13 P.M. AEROVANE.............39 S AT 5:13 P.M. ASOS.................38 S AT 5:14 P.M. DAVIS................39 S AT 4:25 P.M. FASTEST MILE FOR YESTERDAY..............29 S AT 3:09 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........30 S AT 5:06 P.M. MAXIMUM 1-MINUTE DAVIS AVERAGE..........28 S AT 11:35 A.M. AVERAGE WIND SPEED AND DIRECTION........20.6 S ASOS................20.7 DAVIS............. 17.2 S [170 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.26 DEPARTURE.....+0.11 ASOS..............0.26 TOTAL PRECIPITATION FOR THE MONTH..........2.00 DEPARTURE.....+0.35 ASOS..............2.01 TOTAL PRECIPITATION FOR THE YEAR...........7.72 DEPARTURE.....-2.77 ASOS..............7.38 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......-4.2 TOTAL SNOWFALL FOR THE SEASON..............14.3 DEPARTURE.....-35.7 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/.../.. * 25 S 3/10 49/22/36/+2/0/0/.../.. 39 S Aero 39 MPH S 3/11 morning low temp. of 40 deg. occurred at 7:20 A.M. EST; normal low temp. now is now 26 deg. rainfall midnight thru 7 a.m. 0.26 inch * 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 11 HIGH 65 IN 1967 LOW 4 IN 1939, 1960 PRECIP 2.11 INS. IN 1901 SNOWFALL 6.3 INS. IN 1934 PEAK GUST 66e MPH W IN 1980 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 TODAY'S REPORT By: Robert Skilling