BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JUNE 3, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME RAINFALL THIS MORNING JUST SHORT OF A HALF INCH Rain which began early this morning totaled 0.46 inch by the time it ended by noon today. MAY 2013 PRELIMINARY STATISTICS: (departures relative to 1981-2010 average) TEMPERATURE: Average Max Temp: 69.5F [+3.2F] Average Min Temp: 48.2F [+0.4F] Mean Temp: 58.9F [+1.8F] 24-hr. Corr. Mean Temp: 58.2F Max Temp: 92F on 31st Min Temp: 37F on 5th and 26th Total heating degree day units (month): 212 [ -56] *NCDC method Total heating degree day units (season): 5,734 [-569] *start July 1 (NCDC) PRECIPITATION: Total precipitation: 3.71 inches [-0.40 inches] Greatest 24-hr precipitation: N/A Total snowfall: 0.0 [-0.0 inches] Total seasonal snowfall: 99.0 inches [+36.3 inches] WIND: Avg wind speed: 10.9 MPH Avg corrected wind speed: 11.3 MPH Prevailing wind direction: S [18%] Peak gust: 44 MPH NW on 26th Peak fastest mile: 33 MPH SSW on 11th SUNSHINE: Astronomical minutes: 15304/27136 = 57% Campbell-Stokes card minutes: 14850/26226 = 57% Long term average: 52% Today's observations: 7 A.M. Weather: Obscurement with heavy fog, light rain occurring, stratus drifting over the summit Temperature: 65F; Dew Point: 65F; Wind: SW at 5 kts Sea-level pressure: 29.86 ins. Hg, rising then more slowly Visibility: 1/16 variable to 1/8 mile, light rain and heavy fog 6-hr min. temp: 63F 6-hr precip: 0.04 inch 24-hr precip: 0.04 inch BHO SA 1155 W3 X 1/16VR-F 111/65/65/2305/986/ STRA DRFTG OVR SMT VSBY 1/16V1/8/ 8//// 51009 ASOS 60003 MANUAL 6004/ ASOS 70003 MANUAL 70004 10065 20063 10 A.M. Weather: Overcast nimbostratus, few stratus fractus and stratus fractus drifting at and below summit levels all quadrants, light rain occurring Temperature: 63F; Dew Point: 63F; Wind: NW at 4 kts Sea-level pressure: 29.87 ins. Hg, rising then falling slightly Visibility: 35 miles, distant haze BHO SA 1455 E18 OVC R-F 114/63/63/3204/987/ FEW STFRA AND STFRA DRFTG AT/BLO SMT ALQDS VSBY W 1 NW 6 N 1/ 8/62/ 50003 MANUAL 6030/ ASOS 60032 1 P.M. Weather: Broken stratus, stratocumulus, overcast altocumulus, light rain shower began unknown ended 12:48 P.M. very light Temperature: 68F; Dew Point: 65F; Wind: SW at 4 kts, Wind: Light and variable Sea-level pressure: 29.84 ins. Hg, falling then falling more rapidly Visibility: 20 miles, except 12 miles E-SW 6-hour max temp: 68F 6-hour precip: 0.42 in. BHO SA 1755 E7 BKN 85 OVC 20 106/68/65/2304/984/ BINOVC WNW-N BRGHT SPTS IOVC ALQDS SUN DISC VSB VSBY E-SW 12 THN F HAZY ALQDS WND LGT/ REBUKNE48 VRY LGT/ 8/67/ 58008 MANUAL 6042/ ASOS 6//// 10068 20063 WEATHER SUMMARY FOR SUNDAY, JUNE 2, 2013 TEMPERATURE (DEGREES F) MAX.....86 NORMAL.....71 MIN.....64 NORMAL.....53 MEAN....75 NORMAL.....62 DEPARTURE FROM 30-YEAR NORMAL...................+13 TOTAL DEPARTURE FOR THE MONTH...................+31 [+15.3 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE..........-5 TOTAL HEATING UNITS FOR THE MONTH.............0 DEPARTURE.........-10 TOTAL HEATING UNITS FOR THE SEASON.........5734 DEPARTURE........-579 TOTAL HEATING UNITS LAST SEASON TO DATE....4900 DIFFERENCE.......+834 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...............42 SSW AT 1:04 P.M. AERO....................44 SSW AT 1:04 P.M. ASOS....................46 SSW AT 1:04 P.M. DAVIS...................44 SSW AT 1:05 P.M. RMY: 46 FASTEST MILE FOR YESTERDAY.................34 SSW AT 2:35 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..............33 S AT 2:30 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.............35 SSW AT 1:35 P.M. AVERAGE WIND SPEED AND DIRECTION.........18.0 SSW ASOS..................17.7 DAVIS.................16.7 SSW [200 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.04 DEPARTURE...........-0.12 ASOS..............0.03 TOTAL PRECIPITATION FOR THE MONTH..........0.04 DEPARTURE...........-0.33 ASOS..............0.03 TOTAL PRECIPITATION FOR THE YEAR..........20.13 DEPARTURE...........-2.86 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR MAY - JUNE 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust 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 67/45/56/+3/0.00/845/100 18 E AERO 16 MPH E RMY 17 5/2 75/43/59/+6/T/669/79 29 NE AERO 26 MPH NE RMY 29 5/3 54/42/48/-5/0.00/706/83 24 NE AERO 25 MPH NE RMY 28 5/4 55/40/48/-6/0.00/843/99 21 NE AERO 23 MPH NE RMY 23 5/5 58/37/48/-6/0.00/752/88 17 ENE AERO 17 MPH ENE RMY 20 5/6 66/40/53/-1/0.00/600/70 17 S AERO 18 MPH S RMY 20 5/7 77/50/64/+9/0.00/807/94 21 S AERO 23 MPH S RMY 25 5/8 71/55/63/+8/0.42/112/13 31 SSE AERO 35 MPH SSE RMY 35 TSTM 5/9 66/56/61/+6/0.41/078/09 16 NE AERO 16 MPH NE RMY 18 TSTM 5/10 79/54/67/+12/T/333/63 18 S AERO 21 MPH S RMY N/A 5/11 70/56/63/+7/0.06/026/03 43 SSW AERO 44 MPH SSW RMY 46 5/12 71/47/59/+3/0.05/339/39 30 W AERO 32 MPH W RMY 32 5/13 60/41/51/-5/0.00/821/94 25 WSW AERO 28 MPH WSW RMY 30 5/14 58/38/48/-9/T/385/44 22 W AERO 24 MPH W RMY 25 5/15 65/41/53/-4/0.02/456/52 35 S AERO 38 MPH S RMY 40 5/16 80/51/66/+9/0.00/844/96 40 W AERO 45 MPH W RMY 42 5/17 69/50/60/+3/0.00/872/99 24 NW AERO 28 MPH NW RMY 27 5/18 73/47/60/+2/0.00/689/78 21 SE AERO 24 MPH SE RMY 24 5/19 71/50/61/+3/0.11/407/46 21 S AERO 23 MPH S RMY 24 5/20 81/54/68/+10/0.01/496/56 21 S AERO 21 MPH S RMY N/A 5/21 81/49/65/+6/0.14/506/57 29 NE AERO 31 MPH NE RMY 32 TSTM 5/22 66/48/57/-2/0.04/009/01 27 WNW AERO 25 MPH WNW RMY N/A 5/23 74/53/64/+5/0.09/036/04 35 S AERO 39 MPH S RMY 40 5/24 68/49/59/0/0.57/000/00 33 S AERO 35 MPH S RMY N/A 5/25 50/39/45/-15/0.59/000/00 32 NW AERO 35 MPH NW RMY 32 5/26 58/37/48/-12/0.03/332/37 44 NW AERO 44 MPH NW RMY 45 5/27 70/41/56/-4/0.00/880/98 33 WNW AERO 33 MPH WNW RMY 36 5/28 74/55/65/+4/0.00/639/71 20 S AERO 20 MPH S RMY 21 5/29 71/56/61/+3/1.17/045/05 25 W AERO 27 MPH W RMY 27 TSTM 5/30 86/63/75/+14/0.00/839/93 25 W AERO 25 MPH W RMY 27 5/31 92/68/80/+19/0.00/805/89 25 SW AERO 25 MPH SW RMY 27 6/1 90/69/80/+18/0.00/.../.. 30 SW AERO 32 MPH SW RMY 33 6/2 86/64/75/+13/0.00/.../.. 42 SSW AERP 44 MPH SSW RMY 46 6/3 morning low temp: 63F; the normal low is now 53F DAILY RECORDS FOR MAY 2013 5/26 - TIED DAILY RECORD MINIMUM TEMPERATURE OF 37F; previous record of 37F set in 1972. 5/31 - TIED DAILY RECORD MAXIMUM TEMPERATURE OF 92F; previous record of 92F set in 1937. DAILY RECORDS FOR JUNE 2013 6/1 - TIED DAILY RECORD MAXIMUM TEMPERATURE OF 90F; previous record of 90F set in 1937 6/1 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F; surpasses record of 68F set in 1944, 1987 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 3 HIGH 98F IN 1919 LOW 38F IN 1929 PRECIP 2.40 INS 2006 PEAK GUST 47 MPH NW IN 1998 RECORDS FOR JUNE 4 HIGH 99F IN 1919 [Record for month] LOW 41F IN 1915,1926 PRECIP 1.52 INS IN 2007 PEAK GUST 48 MPH SSE IN 1983 TODAY'S REPORT PREPARED BY: Robert Skilling, Mark Medlinskas