BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JUNE 20, 2011 ALL TIMES ARE IN EASTERN STANDARD TIME WARMER TEMPERATURES TODAY THAN YESTERDAY CONTINUED PLEASANTLY DRY AIR RAINFALL NEEDED NOW AFTER DRY WEEK CONTINUED EXCELLENT VISIBILITY TODAY The temperatures were approaching 80 degrees early this afternoon after reaching only 76F yesterday. The air continues dry with the dew points in the low 50's. Yesterday was very dry with dew points down in the 40's. Although the June rainfall is continuing slightly above normal, only one quarter inch has fallen here in just over one week so the ground is becoming quite dry. Visibility is still close to 70 miles despite some increase in light haze. On Sunday our visibility was up to at least 80 miles. Today's observations: 7 A.M. Weather: Scattered dense cirrus, overcast cirrus, thin spots in the overcast, breaks in overcast distant NW-NE Temperature: 65F, Dew point: 48F; Wind: NW at 3 kts, Sea-level pressure: 29.91 inches Hg, rising Visibility: 60 miles, 70 miles NW, light distant haze 6-hour min. temp: 58F 24-hour precip.: 0.00 inch BHO SA 1155 E220 BKN 250 OVC 60 127/65/48/3103/991/ DNS CI ALQDS OVC PTLY THN BINOVC DSNT NW-NE VSBY NW 70 LGT DSNT HZ WND LGT/ 8/002 53006 10065 20058 10 A.M. Weather: Thin broken cirrus, thin overcast cirrus, cumulus forming SE-SSE, WSW-NW-NNE Temperature: 73F, Dew point: 52F; Wind: W at 8 kts, Wind: Direction variable WSW-NW Sea-level pressure: 29.91 inches Hg, falling Visibility: 70 miles, NE-E 30, light distant haze BHO SA 1455 250 –BKN 300 –OVC 70 127/73/52/2808/991/ CU FRMG SE-SSE AND FRMG WSW-NW-NNE BINOVC DSNT N-NE VSBY NE-E 30 LGT DSNT HZ WND 25V31/ 50000 1 P.M. Weather: Scattered dense cirrus/cirrocumulus, thin broken cirrus, small cumulus except NE-E, parahelion in cirrus SW Temperature: 78F, Dew point: 52F; Wind: WNW at 6 kts, Wind: Light Sea-level pressure: 29.87 inches Hg, falling Visibility: 70 miles, 40 miles northeast thru southeasst 6-hour max. temp: 79F BHO SA 1755 220 SCT 250 –BKN 300 –BKN 70 115/78/52/2906/987/ SML CU XCPT NE-E PTCHS DNS CI CC SE-SW PARAHELION IN CI SW VSBY NE-SE 40 LGT DSNT HZ WND LGT/ 8/102 56012 10079 20065 WEATHER SUMMARY FOR SUNDAY, JUNE 19 TEMPERATURE (DEGREES F) MAX.....76 NORMAL.....76 MIN.....59 NORMAL.....57 MEAN....68 NORMAL.....67 DEPARTURE FROM 30-YEAR NORMAL...................+1 TOTAL DEPARTURE FOR THE MONTH...................-2 [-0.3 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE MONTH............70 DEPARTURE........+10 TOTAL HEATING UNITS FOR THE SEASON.........6223 DEPARTURE.......-134 TOTAL HEATING UNITS LAST SEASON TO DATE....5678 DIFFERENCE......+545 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............24 NW AT 8:58 A.M. AEROVANE...............27 NW AT 8:58 A.M. * ASOS...................25 NW AT 8:59 A.M. DAVIS..................27 NW AT 9:02 A.M. THE FASTEST MILE FOR YESTERDAY............19 NW AT 9:03 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............18 NW AT 9:03 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............20 NW AT 9:03 A.M. AVERAGE WIND SPEED AND DIRECTION.........10.7 WNW ASOS..................10.5 DAVIS.................11.4 WNW [290 deg] * last of several occurrences.... 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..........3.11 DEPARTURE........+0.61 ASOS..............3.07 TOTAL PRECIPITATION FOR THE YEAR..........25.30 DEPARTURE........+1.06 ASOS..............25.89** **ASOS data is in error due to system failure on 1/12-13 PRELIMINARY CLIMATE SUMMARY FOR JUNE 2011 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 80/60/70/+8/0.64/425/47 39 S AERO 44 MPH S TSTM 6/2 72/52/62/0/0.00/697/77 50 WSW AERO 54 MPH WSW 6/3 69/48/59/-3/0.00/870/96 36 W AERO 39 MPH WNW 6/4 64/46/55/-8/0.00/881/97 27 NE 6/5 70/46/58/-5/0.00/854/94 20 N 6/6 75/54/65/+2/0.00/801/88 17 SSE 6/7 85/59/72/+8/0.00/865/95 22 NW 6/8 90/64/77/+13/0.00/756/83 32 SW TSTM (no rain) 6/9 88/65/77/+13/0.84/347/38 57 W AERO 60 MPH W TSTM 6/10 74/60/67/+3/0.00/694/76 21 W 6/11 60/50/55/-10/0.83/000/00 28 ENE AERO 30 MPH ENE 6/12 55/50/53/-12/0.56/000/00 29 N 6/13 64/51/58/-7/0.08/220/24 17 NNE 6/14 56/51/54/-11/0.04/000/00 28 NNW 6/15 70/51/61/-5/T/.../.. 27 N 6/16 86/55/71/+5/0.00/.../.. 24 SW 6/17 71/62/67/+1/0.12/.../.. 41 S AERO 43 MPH S 6/18 82/60/71/+5/0.00/../.. 22 WSW 6/19 76/59/68/+1/0.00/.../.. 24 NW 6/20 our morning low temp: 58F; the normal low is now 57F DAILY RECORDS FOR JUNE 2011 None so far... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 20 HIGH 94F IN 1953 LOW 41F IN 1918 PRECIP 2.62 INS 1945 PEAK GUST 63 MPH NE IN 1967, SSW IN 2010 RECORDS FOR JUNE 21 HIGH 92F IN 1949 LOW 42F IN 1940 PRECIP 1.40 INS 1903 PEAK GUST 51 MPH SSW IN 2000 TODAY'S REPORT PREPARED BY: Robert Skilling