BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA ALL TIMES EASTERN DAYLIGHT TIME WEDNESDAY, JULY 20, 2005 Today's discussion at noon... Yesterday's high temperature of 91 degrees (90.6 in Hazen shelter) was the highest reading of the month to date and accompanied by dewpoints in the mid-70's, the heat was about the most oppressive of this summer to date. An early evening light thundershower brought a scant 0.01 inch of rain and much drier air moved in on west to west-northwest winds this morning with dewpoints falling to the much more tolerable mid-60's. TODAY'S OBSERVATIONS...... 8 A.M. clear with 20 miles visibility in light haze; temp. 74; dewpoint 66; wind wnw at 10 mph; six hourly min. temp. 70; 24 hourly rainfall 0.01 inch. BHO SA 1155 CLR 20 140/74/66/2909/994/ HAZY/ 53008 MANUAL 70001 10074 20070 11 a.m. clear with just some cu forming and few ac visibility 30 miles; temp. 84; dewpoint 64; wind wnw 08 mph... BHO SA 1455 CLR 30 142/84/64/3007/995/ CU FRMG ALQDS FEW MDT CU W AC AND FEW ACC OVHD-N-E-S LGT HZ WND 27V33/ 8/280 51002 WEATHER SUMMARY FOR TUESDAY, JULY 19: TEMPERATURE (DEGREES F) MAX.....91 NORMAL.....82 MAX. 90.6 @ 3:00 p.m. MIN.....72 NORMAL.....62 MIN. 72.2 @ 5:30 a.m. MEAN....82 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.....+10 TOTAL DEPARTURE FOR THE MONTH.....-13 (-0.9 DEGREES/DAY ) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........25 W AT 6:27 P.M. AEROVANE........................... 28 W AT 6:27 P.M. ASOS.................................... 24 W AT 6:26 P.M. DAVIS....................................25 W AT 6:20 P.M. FASTEST MILE FOR YESTERDAY........... 20 W AT 6:21 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.....20 W AT 6:28 P.M. MAXIMUM 1-MINUTE DAVIS AVERAGE.....21 W AT 6 :21 P.M. AVERAGE WIND SPEED AND DIRECTION... 10.3 SSW ] ASOS........................................................ 11.0 SW [220 deg ] DAVIS....................................................... 10.6 SSW [ 210 deg ] PRECIPITATION (INCHES) THROUGH THIS MORNING (EDT) TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....0.01 DEPARTURE....-0.11 ASOS.............. 0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.72 DEPARTURE....+0.42 ASOS..............2.72 TOTAL PRECIPITATION FOR THE YEAR..........33.38 DEPARTURE....+5.68 ASOS.............32.40* *EXCLUDES 3.19 INCHES OF ERRONEOUS PRECIPITATION RECORDED FROM 1/23-1/28. PRELIMINARY CLIMATE SUMMARY FOR JULY 2005......CALENDAR DAY DATA DATA REPORTED: DATE MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 7/1 75/60/68/-2/0.02/110/12 20 SSW 7/2 80/62/71/+1/0/776/85 24 W 7/3 77/59/68/-2/0/885/97 18 ENE 7/4 81/58/70/0/0/701/77 22 SSE 7/5 86/60/73/+2/0/783/86 27 S 7/6 71/57/64/-7/*1.43/000/00 35 NNE Aero 38 MPH NNE 7/7 62*/56/59/-12/T/000/00 30 NE 7/8 59*/53/56/-15/1.02/000/00 39 NNE 7/9 76/54/65/-6/0.09/335/37 35 W TSTM 7/10 86/62/74/+3/0/787/87 ** 32 WNW 7/11 88/66/77/+5/0/822/91 30 NW 7/12 76/60/68/-4/0/849/94 21 NE 7/13 77/59/68/-4/0/649/72 27 S 7/14 84/64/74/+2/0/0/648/72 27 SW 7/15 82/67/75/+3/0/681/76 21 NE 7/16 86/66/76/+4/0/600/67 25 S 7/17 82/67/75/+3/0/0/072/08 27 SSE 7/18 83/72/78/+6/0.15/142/16 23 S 7/19 91/72*/82/+10/0.01/508/57 25 W TSTM 7/20 morning low temp. 70 deg; 24 hr. rainfall 0.01 in. ** corrected % of sunshine on 10th from 77 to 87% NEW RECORDS FOR JULY TO DATE.... * 7/6 - NEW RECORD DAILY PRECIP. 1.43 ins.; previous record 1.04 ins. * 7/7 - max. temp. of 62 equaled record low maximum for date set in 1914 * 7/8 - max. temp. of 59 broke record for date; previous 62 in 1919 * 7/19 - min. temp. of 72 tied record high min. for date in 1949 and 1991 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 20 HIGH 99F IN 1991 LOW 47F IN 1890 PRE 1.64 INS IN 1938 WIND 56e MPH SSW IN 1943 RECORDS FOR JULY 21 HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890 PRECIP 2.09 INCHES IN 1938 PEAK GUST 60e MPH WNW IN 1977 TODAY'S REPORT BY: Robert Skilling