BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JULY 2, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER WARM, VERY HUMID DAY WITH OCCASIONAL SHOWERS JUNE 2013 FINISHED AS 10TH WETTEST OF ALL MONTHS Today, much like yesterday, is warm and quite humid. The high temperature has once again reached the lower 80s, with a low of only 70F. The dew point temperature is hovering in the lower 70s once again, making it feel quite humid. Visibility has been kept in the 20-30 mile range. There have been only a few fleeting glimpses of sunshine today. A couple of light morning and early afternoon rain showers have provided only a trace of rainfall today. Showers yesterday evening brought 0.04 inch of rain to the summit. The very wet June 2013 saw measurable precipitation on 16 out of 30 days, and a trace of precipitation or greater on 21 out of 30 days. June preliminary statistics can be found below. Blue Hill Wettest Junes, inches (1886-2013) 1) 17.32 in 1998 2) 13.73 in 1982 3) 12.31 in 2006 4) 12.11 in 2013 5) 10.78 in 1922 Blue Hill Wettest Months, inches (1886-2013): 1) 18.81 in March 2010 2) 18.78 in August 1955 3) 17.32 in June 1998 4) 14.72 in October 2005 5) 13.73 in June 1982 6) 13.07 in March 2001 7) 12.60 in December 1969 8) 12.37 in September 1999 9) 12.31 in June 2006 10) 12.11 in June 2013 JUNE 2013 PRELIMINARY STATISTICS: (departures relative to 1981-2010 average) TEMPERATURE: Average Max Temp: 76.6F [+1.6F] Average Min Temp: 58.0F [+0.9F] Mean Temp: 67.3F [+1.3F] 24-hr. Corr. Mean Temp: 66.4F [+1.1F] Max Temp: 91F on 24th Min Temp: 48F on 4th Total heating degree day units (month): 48 [ -25] *NCDC method Total heating degree day units (season): 5,782 [-594] *start July 1 (NCDC) Total cooling degree day units (month): 125 [ +20] *NCDC method Total cooling degree day units (season): 156 [ +27] *start Jan 1 (NCDC) PRECIPITATION: Total precipitation: 12.11 inches [+7.80 inches] Greatest 24-hr precipitation: 3.98 on 7th/8th WIND: Avg wind speed: 11.5 MPH Avg corrected wind speed: 11.9 MPH Prevailing wind direction: SSW [14%] Peak gust: 45 MPH NW on 17th Peak fastest mile: 40 MPH NW on 17th SUNSHINE: Astronomical minutes: 15,232 of a possible 27,362 or 56% Today's Observations: 7 A.M. Weather: Scattered stratus, scattered stratocumulus, broken altocumulus (2 levels), overcast altocumulus, thin fog/haze all quadrants Temperature: 73F; Dew Point: 71F; Wind: S at 11 kts. Sea-level pressure: 30.16 ins. Hg, rising Visibility: 20 miles, thin fog/haze all quadrants 6-hour precip: Trace 24-hour precip: 0.04 inch 6-hour min. temp: 70F BHO SA 1155 5 SCT 25 SCT E80 BKN 100 BKN 120 OVC 20 213/73/71/1911/016/ THN FG/HZ ALQDS/ 8/67/ 51014 ASOS 70004 MANUAL 70004 MANUAL 6000/ 10073 20070 10 A.M. Weather: Broken stratocumulus (2 levels), broken altocumulus (2 levels), overcast altocumulus, few breaks in overcast E-SE, hazy Temperature: 76F; Dew Point: 72F; Wind: S at 9 kts, Wind: Direction variable SSE-SW Sea-level pressure: 30.17 ins. Hg, rising slightly Visibility: 30 miles, hazy 3-hour precip: Trace BHO SA 1455 E15 BKN 20 BKN 80 BKN 100 BKN 120 OVC 30 216/76/72/1909/017/ FEW BINOVC E-SE HAZY WND16V23/ 8/570 51003 MANUAL 6000/ 1 P.M. Weather: Light rain shower, scattered cumulus, scattered stratocumulus, broken altocumulus (2 levels), overcast altocumulus, towering cumulus band extending distant NNW-NE, moderate cumulus W and distant SSE, breaks in overcast distant SE-SSE, hazy, rain shower SW-W moving NE, light rain shower began at unknown time and continued very light Temperature: 77F; Dew Point: 72; Wind: SSW at 11 kts. Sea-level pressure: 30.18 ins. Hg, rising slightly Visibility: 30 miles, light rain shower, hazy 6-hour precip: Trace 6-hour max. temp: 80F BHO SA 1755 15 SCT 35 SCT E80 BKN 100 BKN 120 OVC 30RW- 219/77/72/2111/018/ TCU BAND XTNDNG DSNT NNW-NE MDT CU W AND DSNT SSE BINOVC DSNT SE-SSE HAZY SHRA SW-W MOVG NE RW-BUKN CTD VRY LGT/ 8/720 51003 MANUAL 6000/ 10080 20072 WEATHER SUMMARY FOR MONDAY, JULY 1, 2013 TEMPERATURE (DEGREES F) MAX.....82 NORMAL.....79 MIN.....69 NORMAL.....61 MEAN....76 NORMAL.....70 DEPARTURE FROM 30-YEAR NORMAL.....................+6 TOTAL DEPARTURE FOR THE MONTH.....................+6 [+5.8 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................29 S AT 3:12 P.M. AERO.....................31 SSW AT 3:06 P.M. ASOS.....................31 S AT 3:12 P.M. DAVIS....................30 S AT 2:59 P.M. RMY 32 FASTEST MILE FOR YESTERDAY..................25 S AT 3:11 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............23 S AT 3:13 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............24 S AT 3:07 P.M. AVERAGE WIND SPEED AND DIRECTION..........11.4 S ASOS...................10.5 DAVIS..................11.8 SSW [194 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.04 DEPARTURE...........-0.07 ASOS..............0.04 TOTAL PRECIPITATION FOR THE MONTH..........0.05 DEPARTURE...........-0.06 ASOS..............0.05 TOTAL PRECIPITATION FOR THE YEAR..........32.25 DEPARTURE...........+5.17 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR JUNE AND JULY 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 6/1 90/69/80/+18/0.00/905/100 30 SW AERO 32 MPH SW RMY 33 6/2 86/64/75/+13/T/761/84 42 SSW AERO 44 MPH SSW RMY 46 6/3 75/57/66/+4/0.47/154/17 22 WNW AERO 22 MPH SSW RMY 22 6/4 70/48/59/-4/0.00/899/99 25 W AERO 25 MPH W RMY 25 6/5 73/51/62/-1/0.00/727/80 20 SSW AERO 21 MPH S RMY 22 6/6 74/54/64/+1/0.03/455/50 22 SSE AERO 22 MPH S RMY 22 6/7 57/51/54/-10/3.28/000/00 33 NE AERO 32 MPH NE RMY 34 6/8 77/52/65/+1/0.78/356/39 29 W AERO 29 MPH W RMY 29 6/9 78/57/68/+4/0.00/886/97 25 W AERO 23 MPH W RMY 25 6/10 69/55/62/-3/0.76/119/13 24 E AERO 24 MPH E RMY N/A 6/11 65/53/59/-6/1.61/000/00 29 E AERO 29 MPH E RMY N/A 6/12 69/54/62/-3/0.01/320/35 38 NW AERO 41 MPH NW RMY 41 6/13 65/50/58/-7/0.93/110/12 32 NE AERO 33 MPH NE RMY 34 6/14 70/51/61/-5/1.38/421/46 32 NE AERO 32 MPH NE RMY 29 6/15 77/56/67/+1/0.00/907/99 23 NW AERO 24 MPH NW RMY 26 6/16 74/57/66/0/0.00/266/29 25 S AERO 24 MPH S RMY 27 6/17 84/60/72/+5/1.27/734/80 45 NW AERO 51 MPH NW RMY 48 TSTM 6/18 74/56/65/-2/0.61/440/48 32 ENE AERO 32 MPH ENE RMY 33 TSTM 6/19 71/53/62/-5/T/761/83 20 NNE AERO 20 MPH NNE RMY N/A 6/20 78/53/66/-2/0.00/889/97 18 SSW AERO 20 MPH SSW RMY N/A 6/21 82/57/70/+2/0.00/724/79 22 SW AERO 22 MPH SW RMY 23 6/22 82/62/72/+4/0.00/743/81 23 SW AERO 24 MPH SW RMY 25 6/23 87/63/75/+7/T/834/91 29 SW AERO 31 MPH SW RMY 32 6/24 91/68/80/+11/0.06/752/82 28 W AERO 30 MPH W RMY 30 TSTM 6/25 90/67/79/+10/T/669/73 32 W AERO 33 MPH W RMY 39 TSTM 6/26 83/65/74/+5/0.02/330/36 20 NNE AERO 20 MPH NNE RMY 20 6/27 66/61/64/-5/T/000/00 20 ENE AERO 17 MPH ENE RMY 20 6/28 78/61/70/0/0.59/329/36 32 S AERO 36 MPH S RMY 36 TSTM 6/29 80/68/74/+4/T/0.14/458/50 30 S AERO 32 MPH S RMY N/A 6/30 83/68/76/+6/0.17/283/31 23 S AERO 24 MPH S RMY 29 7/1 82/69/76/+6/0.05/.../.. 29 S AERO 31 MPH SSW RMY 32 7/2 morning low temp: 70F; the normal low is now 62F 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 previous record of 68F set in 1944, 1987 6/24 - TIED DAILY RECORD MAXIMUM TEMPERATURE OF 91F; previous record of 91F set in 1914, 1976 DAILY RECORDS FOR JULY 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 2 HIGH 95F IN 1963 LOW 47F IN 1988 PRECIP 1.42 INS IN 1986 PEAK GUST 45 MPH SW IN 1999 RECORDS FOR JULY 3 HIGH 99F IN 1911 LOW 47F IN 1914 PRECIP 1.36 IN 1985 PEAK GUST 52 MPH NW IN 1963 TODAY'S REPORT PREPARED BY: Sean Fankhauser