BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, JUNE 21, 2015 FATHERS' DAY ALL TIMES ARE IN EASTERN STANDARD TIME REMNANTS OF BILL PROVIDE MORNING SOAKING TROPICAL AIR REMAINS IN PLACE THIS AFTERNOON Light rain began late yesterday evening and continued light for much of the pre-dawn hours of this Fathers' Day. By sunrise, however, moderate to occasionally heavy rain moved into the area. The storm total for this event so far is 1.18 inches of rain. This rainfall is associated with the remnants of Tropical Storm Bill, which made landfall in Texas early last week. This has eliminated our monthly precipitation deficit to date, although our yearly deficit remains over three inches. Rainfall let up by the mid-morning hours, and has stopped entirely at times, but periodic light showers have continued into early afternoon. Tropical air remains in place as well, with dew points near 70F. Temperatures have been mirroring the dew point, and our high for the day so far is 70F. Winds were SSE for much of the morning but have shifted to SW early this afternoon, running at about 10-15mph with a few gusts over 25mph this morning. Visibility has been under a mile for most of the day with fog, although clouds did lift slightly above the summit at times allowing for brief periods of somewhat higher visibility. The summer solstice occurred at 12:38 P.M. EDT today, marking the official start of astronomical summer. Today's Observations: 7 A.M. Weather: Sky obscured by moderate rain and fog, rain occasionally heavy Temperature: 68F; Dew Point: 68F; Wind: SE at 8 kts Sea-level pressure: 29.83 ins. Hg, falling Visibility: 1/16 mile 6-hr Max temp: 68F 6-hr Min temp: 61F 24-hr precip: 0.93 ins. BHO SA 1155 W2 X 1/16RF 099/68/68/1408/982/ R OCNLY R+/ 8//// 57021 ASOS 60079 70087 MANUAL 70093 10068 20061 10 A.M. Weather: Sky obscured by light rain and fog, stratus fractus drifting above and below summit Temperature: 69F; Dew Point: 69F; Wind: S at 11 kts Sea-level pressure: 29.73 ins. Hg, falling then falling more rapidly Visibility: 1/8 mile 3-hr precip.: 0.17 ins. BHO SA 1455 W3 X 1/8 R-F 068/69/69/1711/973/ STFRA DRFTNG ABV AND BLO SMT/ 8//// 58031 ASOS 60024 MANUAL 60017 1 P.M. Weather: Sky obscured by dense fog, stratus fractus drifting above and below summit, conditions variable Temperature: 70F; Dew Point: 70F; Wind: WSW at 6 kts Sea-level pressure: 29.67 ins. Hg, falling then falling more slowly Visibility: 1/8 mile 6-hr Max temp: 70F 6-hr Min temp: 68F 6-hr precip: 0.25 ins. BHO SA 1755 W3 X 1/8F 049/70/70/2406/967/ STFRA DRFTNG ABV AND BLO SMT CNDTS VRB/ 8//// 56019 ASOS 60032 MANUAL 60025 10070 20068 SUMMARY FOR SATURDAY, JUNE 20, 2015 TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....76 MIN.....56 NORMAL.....59 MEAN....66 NORMAL.....68 DEPARTURE FROM 30-YEAR NORMAL........................-2 TOTAL DEPARTURE FOR THE MONTH.......................-32 [-1.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............0 DEPARTURE...........-2 TOTAL HEATING UNITS FOR THE MONTH..............87 DEPARTURE..........+23 TOTAL HEATING UNITS FOR THE SEASON...........6491 DEPARTURE.........+125 TOTAL HEATING UNITS LAST SEASON TO DATE......6421 DIFFERENCE.........+70 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............1 DEPARTURE..........-3 TOTAL COOLING UNITS FOR THE MONTH..............49 DEPARTURE..........-6 TOTAL COOLING UNITS FOR THE SEASON.............98 DEPARTURE.........+19 TOTAL COOLING UNITS LAST SEASON TO DATE........64 DIFFERENCE........+34 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................23 SSE AT 11:57 P.M. * ASOS........................26 SSW AT 4:23 P.M. DAVIS.......................23 SSW AT 4:22 P.M. RMY N/A FASTEST MILE FOR YESTERDAY.....................18 SSE AT 11:58 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE..................18 S AT 4:23 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................17 S AT 4:23 P.M. AVERAGE WIND SPEED AND DIRECTION..............9.9 NE ASOS......................10.3 DAVIS......................8.5 ESE [105 deg.] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.93 DEPARTURE....+0.80 ASOS...............0.87 TOTAL PRECIPITATION FOR THE MONTH...........3.11 DEPARTURE....-0.03 ASOS...............3.06 TOTAL PRECIPITATION FOR THE YEAR.......... 22.48 DEPARTURE....-3.19 ASOS...............N/A *** *** ASOS annual totals not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST RMY: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 6/1 48/46/47/-15/0.69/000/00 32 NE RMY 34 6/2 47/44/46/-16/..../000/00 28 NNE RMY 28 6/3 59/44/52/-10/0.00/172/19 16 ESE RMY 16 6/4 63/46/55/-8/0.00/445/49 17 E RMY 16 6/5 70/49/60/-3/T/500/55 17 NNE RMY 17 6/6 65/52/59/-4/0.06/382/42 26 ENE RMY 27 6/7 73/49/61/-3/0.00/884/97 28 S RMY 29 6/8 73/50/62/-2/T/310/34 41 SSW RMY 48 6/9 76/61/69/+4/0.03/228/25 29 SSW RMY 32 6/10 82/57/70/+5/0.00/840/92 24 WSW RMY N/A 6/11 85/61/73/+8/0.00/594/65 29 SSW RMY 32 6/12 86/65/76/+11/..../522/57 26 S RMY 29 6/13 83/67/75/+10/T/586/64 24 N RMY 27 6/14 75/61/68/+2/0.00/641/70 21 SSE RMY 21 6/15 61/52/57/-9/..../000/00 25 SE RMY 26 6/16 73/56/65/-1/..../009/01 18 NW RMY N/A 6/17 70/57/64/-3/0.00/.../.. 28 NE RMY 28 6/18 76/54/65/-2/0.00/.../.. 22 S RMY 26 6/19 84/60/72/+5/T/.../.. 24 SSW RMY 22 6/20 75/56/66/-2/..../.../.. 23 SSE RMY N/A 6/21 low since midnight is 60F; normal low is now 59F DAILY RECORDS FOR JUNE 2015 6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F surpasses previous record of 51F in 2004 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 21 HIGH 94F IN 2012 LOW 42F IN 1940 PRECIP 1.40 INS 1903 PEAK GUST 51 MPH SSW IN 2000 RECORDS FOR JUNE 22 HIGH 93F IN 1921, 2012 LOW 43F IN 1940 PRECIP 1.57 INS IN 1900 PEAK GUST 74 MPH NW IN 1988 TODAY'S REPORT PREPARED BY: Jonathan O'Brien