BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MAY 5, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED OVERCAST, COLD AND DAMP FIRST WEEKEND OF MAY PERIODS OF LIGHT RAIN TOTAL ONE THIRD OF AN INCH Dense fog cleared away rather quickly this morning shortly after 8 a.m. allowing the first sunshine since Thursday, May 1st. The first four days of May have averaged close to 7 degrees colder than normal, more in keeping with April than early May. Despite periods of light rain during the past three days the monthly total of 0.33 inches falls short of the normal of 0.52 inch. Today's observations: 8 A.M. EDT Weather: Partial obscurement with fog, fog obscuring 4/10, with scattered cirrus Temperature: 43F, Dew point: 43F, Wind: NW at 8 kts Sea-level pressure: 30.09 inches of Hg., rising Visibility: 1/2 variable, variable 1/4 to 3/4, SE 5, NW 1 6-hour min temp: 40F 24-hour precip: 0.10 inches BHO SA 1155 ?X 300 SCT 1/2VF 191/43/43/3108/009/ F4 STRA DRFTG OVR SMT VSBY 1/4VV3/4 SE 5 NW 1 VSBY INCRSNG RPDLY/ 8/001 53011 ASOS 70011 MANUAL 70010 10044 20040 11 A.M. EDT Weather: Clear, cumulus forming S-W-N, stratus/fog offshore NE-E Temperature: 58F, Dew point: 44F, Wind: NE at 5 kts Wind: light Sea-level pressure: 30.09 inches Hg, falling Visibility: 45 miles, 20 miles NE-E BHO SA 1455 CLR 45 190/58/44/0505/009/ CU FRMG S-W-N STRA/FG OFFSHR NE-E VSBY NE-E 20 LGT HZ/ 8/100 WND LGT/ 8/100 58001 2 P.M. EDT Weather: Scattered cumulus and thin cirrus Temperature: 62F, Dew point: 42F, Wind: NNW at 2 kts Wind: light and variable Sea-level pressure: 30.05 inches Hg, falling Visibility: 50 miles, 25 NE-E 6-hour max. 63F BHO SA 1755 45 SCT 300 -SCT 50 176/62/42/E3402/005/ WND L/V/ 8/101 57014 10063 20044 WEATHER SUMMARY FOR SUNDAY, MAY 4 TEMPERATURE (DEGREES F) MAX.....50 NORMAL.....63 MIN.....42 NORMAL.....43 MEAN....46 NORMAL.....53 DEPARTURE FROM 30-YEAR NORMAL............-7 TOTAL DEPARTURE FOR THE MONTH...........-28 [-6.8 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............19 DEPARTURE........+9 TOTAL HEATING UNITS FOR THE MONTH............78 DEPARTURE.......+27 TOTAL HEATING UNITS FOR THE SEASON.........5689 DEPARTURE......-388 TOTAL HEATING UNITS LAST SEASON TO DATE....5655 DIFFERENCE......+34 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............27 E AT 4:14 A.M. AEROVANE.............25 E AT 4:14 A.M. ASOS.................24 E AT 4:14 A.M. DAVIS................24 E AT 4:14 A.M. FASTEST MILE FOR YESTERDAY..............18 E AT 4:18 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........18 E AT 4:16 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 E AT 4:16 A.M. AVERAGE............ 9.3 E ASOS................9.1 DAVIS...............9.8 NNE [030 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.10 DEPARTURE......-0.03 ASOS..............0.11 TOTAL PRECIPITATION FOR THE MONTH..........0.33 DEPARTURE......-0.19 ASOS..............0.32 TOTAL PRECIPITATION FOR THE YEAR..........21.09 DEPARTURE......+2.62 ASOS.............23.55 # # Includes erroneous ASOS precipitation data on 2/13/08. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0 DEPARTURE.......0.0 TOTAL SNOWFALL FOR THE MONTH...............0.0 DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE SEASON.............66.5 DEPARTURE......+6.4 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available, records not finalized 4/1 59/50/55/+14/0.20/0/000/00 54 S Aero 58 MPH SSW 4/2 47/31/39/-3/0/0/745/97 52 W Aero 51 MPH W 4/3 52/27/40/-2/0/0/648/84 37 SSW 4/4 43/34/39/-3/0.71/0/000/00 35 E 4/5 51/37/44/+1/0.06/0/093/12 21 W 4/6 40/36/38/-5/0.09/0/000/00 36 NE 4/7 39/34/37/-6/0/0/172/22 35 NE Aero 36 MPH NE 4/8 47/30/39/-5/0/0/627/80 22 NE 4/9 59/33/47/+3/0/0/150/19 29 S 4/10 71/44/58/+14/T/0/624/79 34 W 4/11 54/40/47/+2/0.03/096/13 24 SE 4/12 70/43/57/+12/0.43/0/342/43 40 WNW Aero 42 WNW 4/13 47/34/41/-4/T/0/104/13 30 NW 4/14 53/30/42/-4/0/0/625/78 29 NW 4/15 57/33/45/-1/0/0/803/100 23 SSE 4/16 64/39/52/+6/0/0/806/100 24 SSE 4/17 64/14/53/+6/0/0/810/100 23 NE 4/18 70/42/56/+9/0/0/723/89 23 NW 4/19 70/46/58/+11/0/0/799/98 22 NE 4/20 67/42/55/+7/0/0/760/93 25 ESE 4/21 61/41/51/+3/0/0/615/75 17 E 4/22 74/45/60/+11/0/0/789/96 23 S 4/23 83/50/67/+18/0/0/784/95 25 SW 4/24 72/53/63/+14/0/0/802/97 38 WNW Aero 39 WNW 4/25 71/46/59/+9/0/0/557/67 25 E 4/26 55/42/49/-1/T/0/716/86 27 ENE 4/27 49/40/45/-5/0.02/0/000/00 16 ESE 4/28 57/39/48/-3/0.67/0/008/01 39 SE Aero 39 SE 4/29 60/39/50/-1/0.95/0/008/01 44 WNW Aero 44 WNW 4/30 54/35/45/-7/0/0/700/83 29 WSW PRELIMINARY CLIMATE SUMMARY FOR MAY 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available, records not finalized 5/1 60/35/48/-4/0/0/.../.. 30 W Aero 28 W 5/2 48/42/45/-7/.../0/000/00 21 ENE 5/3 44/41/43/-10/.../0/000/00 25 E 5/4 50/42/46/-7/.../0/000/00 27 E 5/5 morning low temp. 40F; our normal low is now 44F NEW DAILY RECORDS FOR MAY 2008 None to date. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 5 HIGH 92F IN 1949 LOW 30F IN 1891 PRECIP 2.74 INCHES IN 1922 SNOWFALL 3.0 INCHES IN 1917 PEAK GUST 58 MPH S IN 1966 & 58e MPH SW IN 1976 RECORDS FOR MAY 6 HIGH 90F IN 1930 LOW 29F IN 1891 PRECIP 1.04 INCHES IN 1890 SNOWFALL TRACE IN 1917,1996 PEAK GUST 65 MPH SSE IN 1989 TODAY'S REPORT PREPARED By: Robert Skilling