BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JUNE 26, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME HAZY AND WARM WITH FILTERED SUNSHINE TODAY... A thin veil of high clouds with a few mid-level clouds has filled the sky since sunrise, though the temperature has climbed to the low 80s even with the filtered sunshine. A partial halo has been visible around the sun through the high clouds since mid-morning. Today will be the ninth consecutive day to average warmer than normal since a cool period ended during the middle of June. The month continues about 2.5 degrees warmer than average per day. Today's observations: 7 A.M. Weather: Scattered dense cirrus, thin overcast cirrus, few altocumulus, hazy Temperature: 68F, Dew point: 63F; Wind: SW at 5 kts Sea-level pressure: 29.94 inches Hg, rising Visibility: 25 miles, hazy 6-hour minimum temp: 64F 24-hour rainfall: 0.00 inch BHO SA 1155 220 SCT 270 –OVC 25 140/68/63/2305/994/ FEW AC HAZY WND LGT/ 8/071 51007 10068 20064 10 A.M. Weather: Scattered dense cirrus, thin overcast cirrus, few small cumulus SE-SSE, hazy, partial halo Temperature: 76F, Dew point: 56F; Wind: W at 9 kts Sea-level pressure: 29.91 inches Hg, falling Visibility: 20 miles, hazy BHO SA 1455 200 SCT 250 –OVC 20 130/76/56/2609/991/ FEW SML CU SE-SSE HAZY PARTIAL HALO/ 8/101 56010 1 P.M. Weather: Scattered altocumulus, scattered altocumulus lenticularis, thin overcast cirrus, few cirrocumulus, hazy, partial halo Temperature: 80F, Dew point: 54F; Wind: WSW at 9 kts, Wind: Direction variable SSW-W Sea-level pressure: 29.87 inches Hg, falling Visibility: 20 miles, hazy 6-hour maximum temp: 82F BHO SA 1755 120 SCT 160 SCT 250 –OVC 20 116/80/54/2409/ 987/ FEW CC ACSL WNW-NNE HAZY WND 21V27 PARTIAL HALO/ 8/047 57014 10082 20068 WEATHER SUMMARY FOR FRIDAY, JUNE 25 TEMPERATURE (DEGREES F) MAX.....83 NORMAL.....78 MIN.....62 NORMAL.....58 MEAN....73 NORMAL.....68 DEPARTURE FROM 30-YEAR AVERAGE................+5 TOTAL DEPARTURE FOR THE MONTH................+69 [+2.6 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE........-1 TOTAL HEATING UNITS FOR THE MONTH............37 DEPARTURE.......-32 TOTAL HEATING UNITS FOR THE SEASON.........5678 DEPARTURE......-688 TOTAL HEATING UNITS LAST SEASON TO DATE....6231 DIFFERENCE.....-553 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............22 S AT 7:48 P.M. * AEROVANE..............21 NW AT 5:18 A.M. ASOS..................N/A ** DAVIS.................23 WNW AT N/A THE FASTEST MILE FOR YESTERDAY...........17 S AT 5:40 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............18 SSW AT 5:40 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A AVERAGE WIND SPEED AND DIRECTION........9.6 SW ASOS.................N/A ** DAVIS................9.2 W [264 DEG] * Last of several occurrences ** Not available due to ASOS failure on 7/24-25 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE........-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.62 DEPARTURE........-0.66 ASOS..............2.29 ** TOTAL PRECIPITATION FOR THE YEAR..........36.03 DEPARTURE.......+11.01 ASOS.............35.77 ** ** ASOS missing rainfall due to system failure on 7/24-25 PRELIMINARY CLIMATE SUMMARY FOR JUNE 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 6/1 82/57/70/+8/0.86/0/199/22 33 WNW AERO 38 MPH WNW TSTM 6/2 80/59/70/+8/0.00/752/83 22 S 6/3 80/59/70/+8/T/263/29 28 S AERO 31 MPH S TSTM 6/4 84/59/72/+9/0/499/55 23 SSW 6/5 83/63/73/+10/0.16/309/34 32 W AERO 36 MPH W TSTM 6/6 80/54/67/+4/0.07/064/07 43 S AERO 48 MPH S TSTM 6/7 72/51/62/-2/T/683/75 27 W AERO 30 MPH WNW 6/8 69/51/60/-4/T/812/89 30 WNW AERO 33 MPH WNW 6/9 70/49/60/-4/0.18/247/27 27 SSW 6/10 58/50/54/-10/0.13/0/0 22 ESE 6/11 68/53/61/-4/0/320/35 20 S 6/12 66/55/61/-4/0.22/091/10 18 SSE 6/13 64/56/60/-5/0.02/0/0 18 N 6/14 75/56/66/+1/0.01/247/27 22 NNW 6/15 77/53/65/-1/0/889/97 21 WNW 6/16 75/56/66/0/0.10/238/26 29 S AERO 31 MPH S 6/17 72/58/65/-1/0.01/128/14 29 WNW 6/18 86/58/72/+6/0/889/97 21 SW 6/19 83/63/73/+6/0/889/97 32 S 6/20 87/63/75/+8/0.50/431/47 63 SSW AERO 66 MPH SSW TSTM 6/21 86/66/76/+9/0/.../.. 21 N 6/22 79/63/71/+4/T/.../.. 21 SSE 6/23 84/65/75/+7/0.07/.../.. 32 W 6/24 90/68/79/+11/0.29/.../.. 54 WNW AERO 57 MPH WNW TSTM 6/25 83/62/73/+5/0/.../.. 22 S 6/26 overnight low temp: 64F; the normal low is now 59F NEW DAILY RECORDS FOR JUNE 2010 6/20 - Peak wind gust of 63 MPH SSW equals record for the date of 63 MPH NE in 1967. 6/24 - Peak wind gust of 54 MPH WNW surpasses record for the date of 46 MPH S in 1985. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 26 HIGH 96F IN 1952 LOW 45F IN 1986 PRECIP 1.52 INS IN 1945 PEAK GUST 48 MPH N IN 1998 RECORDS FOR JUNE 27 HIGH 93F IN 1999, 2007 LOW 46F IN 1897 PRECIP 1.72 INS IN 1938 PEAK GUST 55e N IN 1945 TODAY'S REPORT PREPARED BY: Mike Iacono