BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MAY 24, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear, stratus layer distant SE-SW, altocumulus and altocumulus lenticularis distant SW-N, cirrus layer distant SE-SW Temperature: 66F, Dew Point: 60F; Wind: S at 4 kts Sea-level pressure: 30.20 inches Hg, rising then more slowly Visibility: 25 miles, hazy 6-hour min. temp: 59F BHO SA 1155 CLR 25 226/66/60/1704/020/ LONE CU FRMG OVR CTY N STRA LYR XTDNG ALG HRZN DSNT SE-SW AC/ACSL DSNT SW-N CI LYR DSNT SE-SW HAZY/ 8/641 51020 10066 20059 10 A.M. Weather: Scattered cumulus, scattered altocumulus, scattered cirrus, few lower cumulus/stratocumulus distant SE-S, cirrus layer distant S-SSW, hazy Temperature: 71F, Dew Point: 62F; Wind: SSE at 9 kts Sea-level pressure: 30.22 inches Hg, rising Visibility: 40 miles, NE 35 miles, WNW 45 miles, hazy BHO SA 1455 45 SCT 120 SCT 250 SCT 40 235/71/62/1509/022/ FEW LWR CU/SC DSNT SE-S CI LYR DSNT S-SSW HAZY VSBY NE 35 WNW 45/ 8/541 51009 1 P.M. Weather: Broken stratocumulus (2 levels), stratocumulus layer distant NW-N, hazy Temperature: 73F, Dew Point: 61F; Wind: SE at 7 kts Sea-level pressure: 30.23 inches Hg, rising Visibility: 40 miles, NE 30 miles, WNW 45 miles, hazy 6-hour max. temp: 74F BHO SA 1755 E30 BKN 40 BKN 40 236/73/61/1407/023/ SC LYR DSNT NW-N HAZY VSBY NE 30 WNW 45/ 8/500 50001 10074 20066 WEATHER SUMMARY FOR WEDNESDAY, MAY 23 TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....68 MIN.....57 NORMAL.....50 MEAN....66 NORMAL.....59 DEPARTURE FROM 30-YEAR NORMAL........................+7 TOTAL DEPARTURE FOR THE MONTH.......................+42 [+1.6 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY...............0 DEPARTURE..........-7 TOTAL HEATING UNITS FOR THE MONTH.............174 DEPARTURE.........-52 TOTAL HEATING UNITS FOR THE SEASON...........4888 DEPARTURE.......-1364 TOTAL HEATING UNITS LAST SEASON TO DATE......6153 DIFFERENCE......-1265 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............15 S AT 8:23 P.M. AERO..................16 S AT 8:23 P.M. ASOS..................15 S AT 9:23 P.M. DAVIS.................15 SSE AT 8:24 P.M. RMY 15 THE FASTEST MILE FOR YESTERDAY...........11 S AT 9:38 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............12 S AT 9:38 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........12 SSE AT 8:25 P.M. AVERAGE WIND SPEED AND DIRECTION....... 5.3 NNW ASOS.................5.2 DAVIS................5.0 E [090 deg.] * Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE..........-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.51 DEPARTURE..........+0.61 ASOS..............3.40 TOTAL PRECIPITATION FOR THE YEAR..........13.12 DEPARTURE..........-8.33 ASOS.............13.13 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/+1/0.98/0.0/234/27 33 W AERO 36 MPH W RMY 37 5/11 62/42/52/-4/T/0.0/539/62 30 WNW AERO 33 MPH WNW RMY 34 5/12 77/46/62/+6/0.00/0.0/862/99 30 W AERO 30 MPH W RMY 29 5/13 82/57/70/+14/0.00/0.0/314/36 27 S AERO 29 MPH S RMY 29 5/14 71/52/62/+5/0.05/0.0/096/11 23 S AERO 24 MPH S RMY 23 5/15 72/57/65/+8/0.43/0.0/123/14 32 S AERO 35 MPH S RMY 33 5/16 71/58/65/+8/0.12/0.0/141/16 23 S AERO 24 MPH S RMY N/A 5/17 69/50/60/+3/0.00/0.0/784/89 31 WNW AERO 32 MPH WNW RMY 26 5/18 69/49/59/+1/0.00/0.0/857/97 17 ESE AERO 17 MPH ESE RMY 17 5/19 74/51/63/+5/0.00/0.0/876/99 15 WNW AERO 15 MPH WNW RMY 16 5/20 79/56/68/+10/0.00/0.0/727/82 17 SE AERO 17 MPH SE RMY 17 5/21 64/52/58/-1/0.02/0.0/000/00 17 NE AERO 16 MPH NNE RMY 18 5/22 61/56/59/0/0.54/0.0/000/00 23 NE AERO 23 MPH NE RMY 23 5/23 75/57/66/+7/0.00/0.0/.../.. 15 S AERO 16 MPH S RMY 15 5/24 our morning low temp: 59F; the normal low is now 50F DAILY RECORDS FOR MAY 2012 5/16 - TIED DAILY RECORD HIGH MINIMUM TEMP OF 56F; ties the record of 56F in 1951 and 1961. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 24 HIGH 92F IN 1964 LOW 35F IN 1956 PRECIP 2.13 INS IN 1951 PEAK GUST 54 MPH NNE IN 2005 RECORDS FOR MAY 25 HIGH 91F IN 2007 LOW 37F IN 1967 PRECIP 3.73 INS IN 1967 PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY) TODAY'S REPORT PREPARED BY: Robert Skilling/William Wilson