BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MAY 14, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME HOTTEST TEMPERATURE (82F) YESTERDAY SINCE APRIL 17 READING FALLS 3 DEGREES SHORT OF RECORD 85 IN 1947 BRIEF LIGHT RAIN SHOWERS EARLY THIS MORNING The maximum temperature of 82 degrees yesterday was our highest since 83 degrees on April 17 and just 3 degrees short of a 1947 record of 85 degrees. Yesterday averaged 14 degrees warmer than normal and the month of May is now very close to normal after being cooler than normal up to this point. A shower early today brought just 0.01 inch of rainfall. Today's observations: 7 A.M. Weather: Scatterd altocumulus castellanus, scattered altocumulus, overcast altostratus, stratus later ESE-SW, sun dimly visible Temperature: 55F, Dew Point: 53F; Wind: SSE at 6 kts, Wind: Decreased in speed rapidly, becoming light and variable Sea-level pressure: 30.17 inches Hg, rising then more slowly Visibility: 6 miles, except north 9 miles, SE-SW 5 miles, thin fog all quadrants. 6-hour rainfall: 0.01 in. 24-hour rainfall: 0.01 in. 6-hour min. temp: 52F BHO SA 1155 70 SCT E90 BKN 150 OVC 6F 217/55/53/1606/017/ STRA LYR ESE-SW SUN DMLY VSB VSBY N 9 SE-SW 5 WND DCRSD RPDLY BCMG L/V RE20/ 8/67/ 51018 MANUAL 6001/ ASOS 60000 10058 20052 10 A.M. Weather: Scattered altocumulus castellanus, vicinity of station, overhead thru south thru east, broken altocumulus, broken dense cirrus, overcast cirrus, altocumulus and cirrus layers partly thin Temperature: 65F, Dew Point: 55F; Wind: W at 3 kts, Wind: Light variable Sea-level pressure: 30.19 inches Hg, rising then more slowly Visibility: 12 miles, hazy BHO SA 1455 70 SCT E150 220 BKN 250 OVC 12 224/65/55/2703/019/ ACC VC STN OVHD-S-E PTCHS DNS CI AC/CI LYRS PARTLY THN HAZY WND L/V/ 8/082 51007 1 P.M. Weather: Broken moderate, few towering cumulus, dark bases, overcast altocumulus, small break in overcast overhead Temperature: 66F, Dew Point: 53F; Wind: ENE at 4 kts, Wind: Light Sea-level pressure: 30.15 inches Hg, falling Visibility: 20 miles, except 15 miles N-E, hazy 6-hour max. temp: 71F BHO SA 1755 E30 BKN 95 OVC 20 209/66/53/0604/015/ MDT CU FEW TCU DRK BASES SML BINOVC OVHD VSBY N-E 15 HAZY ALQDS WND LGT/ 8/27/ 58011 10071 20055 WEATHER SUMMARY FOR SUNDAY, MAY 13, MOTHERS DAY TEMPERATURE (DEGREES F) MAX.....82 NORMAL.....65 MIN.....57 NORMAL.....47 MEAN....70 NORMAL.....56 DEPARTURE FROM 30-YEAR NORMAL.......................+14 TOTAL DEPARTURE FOR THE MONTH........................-4 [-0.1 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY...............0 DEPARTURE..........-9 TOTAL HEATING UNITS FOR THE MONTH.............145 DEPARTURE..........-2 TOTAL HEATING UNITS FOR THE SEASON...........4859 DEPARTURE.......-1314 TOTAL HEATING UNITS LAST SEASON TO DATE......6031 DIFFERENCE......-1172 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............27 S AT 6:42 P.M. * AERO..................29 S AT 3:40 P.M. ASOS..................28 S AT 6:42 P.M. DAVIS.................28 S AT 6:42 P.M. RMY 29 THE FASTEST MILE FOR YESTERDAY...........22 S AT 3:40 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............22 S AT 3:42 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........21 S AT 3:42 P.M. AVERAGE WIND SPEED AND DIRECTION.......11.7 SSW ASOS................11.8 DAVIS...............10.6 SW [220 deg.] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE..........-0.11 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.36 DEPARTURE..........+0.77 ASOS..............2.29 TOTAL PRECIPITATION FOR THE YEAR..........11.97 DEPARTURE..........-8.17 ASOS.............12.02 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..............24.2 DEPARTURE.........-35.9 PRELIMINARY CLIMATE SUMMARY FOR MAY 2012 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 5/1 47/42/45/-8/0.65/0.0/000/00 33 SE AERO 36 MPH SE RMY 37 5/2 50/43/47/-6/0.05/0.0/000/00 16 ENE AERO 16 MPH ENE RMY 17 5/3 51/44/48/-5/0.08/0.0/000/00 14 SSE AERO 16 MPH SSE RMY N/A 5/4 56/47/52/-2/0.01/0.0/000/00 21 SSW AERO 25 MPH SSW RMY 23 5/5 57/46/52/-2/0.04/0.0/034/04 14 NE AERO 15 MPH NE RMY 15 5/6 58/45/52/-2/0.00/0.0/532/62 21 ENE AERO 21 MPH ENE RMY 21 5/7 67/48/58/+3/0.00/0.0/740/86 23 S AERO 25 MPH S RMY 25 5/8 57/48/53/-2/0.18/0.0/000/00 40 S AERO 46 MPH S RMY 46 5/9 61/54/58/+3/0.36/0.0/000/00 25 S AERO 28 MPH S RMY N/A 5/10 65/46/56/+1/0.98/0.0/.../.. 33 W AERO 36 MPH W RMY 37 5/11 62/42/52/-4/T/0.0/.../.. 30 WNW AERO 33 MPH WNW RMY 34 5/12 77/46/62/+6/0.00/0.0/.../.. 30 W AERO 30 MPH W RMY 29 5/13 82/57/70/+14/0.00/0.0/.../.. 27 S AERO 29 MPH S RMY 29 5/14 morning low temp: 52F; the normal low is now 47F DAILY RECORDS FOR MAY 2012 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 14 HIGH 85F IN 1961 LOW 33F IN 1895 PRECIP 1.93 INCHES IN 2006 PEAK GUST 53 MPH S IN 2009 RECORDS FOR MAY 15 HIGH 93F IN 1900 LOW 36F IN 1947,1985 PRECIP 1.63 INCHES IN 1978 PEAK GUST 53e MPH NE IN 1978, W 2002 TODAY'S REPORT PREPARED BY: Robert Skilling/Patrick Peters