BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA ALL TIMES EASTERN DAYLIGHT TIME TUESDAY, JULY 19, 2005 Today's discussion at 2 p.m. VERY OPPRESSIVE HUMDITY AGAIN TODAY...DEWPOINT UP TO 76 TO 77 DEGREES.... Extraordinarily high humidity again today for the second day in a row with dewpoints between 73 and 77 degrees. The high temperature as of 2 p.m. had reached 90 degrees with a dewpoint of 76 degrees. Yesterday I measured aa dewpoint of 78 degrees with the sling psychrometer during the late morning after a brief moderate rain shower had ended and the sun came out. TODAY'S OBSERVATIONS...... 8 A.M. low status overcast with 2 miles visibility in fog; temp. 75; dewpoint 73; wind ssw at 09 mph; sun disc ocnly visible; six hourly min. temp. 72; 24 hourly rainfall 0.15 inch... BHO SA 1155 E4 OVC 2F 134/75/73/2108/993/ BRGHT SPTS IOVC SUN DISC OCNL VSB/ 8/6// 51009 ASOS 70015 MANUAL 70015 10075 20072 11 A.M. partial obscurement with haze and scattered low clouds; visibility 4 miles in thick haze; temp. 84; dewpoint 75; wind ssw at 06 mph.... BHO SA 1455 -X 15 SCT 4H 135/84/75/2005/993/ H1/ 8/500 50001 2 P.M. partial obscurement with hazy and scattered cumulus and few towering cu and visibility 5 miles in thick haze; temp. 90; dewpoint 76 wind south at 08 mph/ max temp. past 6 hrs 90 deg. BHO SA 1755 -X 30 SCT 5H 118/90/76/1807/988/ H1 FEW TCU MDT CU ALQDS WND 15V21/ 8/200 58017 10090 20075 WEATHER SUMMARY FOR MONDAY, JULY 18: TEMPERATURE (DEGREES F) MAX.....83 NORMAL.....82 MAX. 83.0 @ 3:15 p.m. MIN.....72 NORMAL.....62 MIN. 71.8 @ 5:18 a.m. MEAN....78 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.....+ 6 TOTAL DEPARTURE FOR THE MONTH.....-23 (-1.5 DEGREES/DAY ) TOTAL HEATING UNITS FOR YESTERDAY.......0 DEP..... 0 TOTAL HEATING UNITS FOR JULY..................16 DEP......+7 FINAL HEATING DEGREE DAY UNITS FOR 2004-2005 SEASON: TOTAL HEATING UNITS FOR THE JUNE........63 DEP....-11 TOTAL HEATING UNITS FOR THE SEASON 2004-2005....6409 DEP....+38 TOTAL HEATING UNITS FOR LAST SEASON..................6291 DIF.....+118 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........23 S AT 3:21 P.M. AEROVANE........................... 25 S AT 3:21 P.M. ASOS.................................... 22 S AT 3:21 P.M. DAVIS....................................26 S AT : 5:58 P.M. FASTEST MILE FOR YESTERDAY........... N/A MAXIMUM 2-MINUTE ASOS AVERAGE.....17 S AT 3:39 P.M. MAXIMUM 1-MINUTE DAVIS AVERAGE.....19 S AT 3:45 P.M. AVERAGE WIND SPEED AND DIRECTION... N/A ASOS........................................................ 11.6 S [ ] DAVIS....................................................... 11.0 S [ 170 deg ] PRECIPITATION (INCHES) THROUGH THIS MORNING (EDT) TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....0.15 DEPARTURE....+0.03 ASOS.............. 0.15 TOTAL PRECIPITATION FOR THE MONTH..........2.71 DEPARTURE....+0.53 ASOS..............2.72 TOTAL PRECIPITATION FOR THE YEAR..........33.37 DEPARTURE....+5.79 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 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/.../.. 27 SSE 7/18 83/72/78/+6/0.15/.../.. 23 S 7/19 morning low temp. 72 deg. ** 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 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 19 HIGH 96F IN 1977, 1991 LOW 50F IN 1890 PRE 1.10 INS IN 1951 WIND 63 MPH SSW IN 1982 RECORDS FOR JULY 20 HIGH 99F IN 1991 LOW 47F IN 1890 PRE 1.64 INS IN 1938 WIND 56e MPH SSW IN 1943 TODAY'S REPORT BY: Robert Skilling