BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, MAY 29, 2016 ALL TIMES ARE IN EASTERN STANDARD TIME BACK-DOOR COLD FRONT BRINGS MUCH, MUCH COOLER WEATHER TODAY FROM THE 90'S TO THE 60'S After 90-degree heat which broke a record yesterday a "back-door" cold front passed over the Blue Hill shortly after 3 A.M. EDT this morning accompanied by a wind shift from SSW-W to NNE. The temperature fell from the low 70's very early today to the upper 50's by around dawn this morning. We were only in the low 60's by noon today under a low stratus overcast with northeast winds. RECORD HEAT AT OBSERVATORY ON SATURDAY, 28 MAY 2016 NEW RECORD HIGH MAXIMUM OF 92 DEGREES; MINIMUM OF 63F (CORRECTED) FELL ONE SHORT OF RECORD The maximum temperature as recorded in the official Hazen temperature shelter was 92.2F at 3:15 P.M. EDT. This surpasses the previous record of 90F set on 28 May 1929. **The minimum temperature of 63F occurred in the early morning hours yesterday but fell one degree short of the record high minimum of 64F set in 1914. Today's Observations: 7 A.M. Weather: Overcast stratus, thin fog Temperature: 59F; Dew Point: 56F; Wind: N at 4 kts, Wind: Light Sea-level pressure: 30.20 ins. Hg, rising, then more slowly Visibility: 4 miles, thin fog 6-hr Max temp: 71F 6-hr Min temp: 58F 24-hr precip: none BHO SA 1155 E4 OVC 4F 226/59/56/3604/020/ WND LGT/ 8/6// 51018 10071 20058 10 A.M. Weather: Overcast stratus, bright spots in the overcast, sun occasionally dimly visible, thin fog Temperature: 61F; Dew Point: 56F; Wind: NE at 8 kts, Wind: Direction variable, N-E Sea-level pressure: 30.21 ins. Hg, rising slightly Visibility: 5 miles, thin fog, except 4 miles E, 8 miles SW BHO SA 1455 E6 OVC 5F 231/61/56/0508/021/ BRGHT SPTS IOVC SUN OCNL DMLY VSB VSBY E 4 SW 8 WND 35V09/ 8/6// 51005 1 P.M. Weather: Bright overcast stratus, sun dimly visible, thn fog and hazy Temperature: 62F; Dew Point: 55F; Wind: NE at 8 kts Sea-level pressure: 30.21 ins. Hg, falling slightly Visibility: 30 miles, hazy 6-hr Max temp: 63F 6-hr Min temp: 59F BHO SA 1755 E12 OVC 8 229/62/55/0508/021/ OVC BRGHT SUN DMLY VSB VSBY NE-SE 6 THN F HAZY ALQDS WND 01V09/ 8/6// 58002 10063 20059 SUMMARY FOR SATURDAY, MAY 28, 2016 TEMPERATURE (DEGREES F) MAX.....92* NORMAL.....70 MIN.....63 NORMAL.....51 MEAN....78 NORMAL.....61 DEPARTURE FROM 30-YEAR NORMAL.........................+17 TOTAL DEPARTURE FOR THE MONTH.........................+16 [+0.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............0 DEPARTURE..........-6 TOTAL HEATING UNITS FOR THE MONTH.............250 DEPARTURE..........-2 TOTAL HEATING UNITS FOR THE SEASON...........5242 DEPARTURE.......-1045 TOTAL HEATING UNITS LAST SEASON TO DATE......6401 DIFFERENCE......-1159 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................22 SSW AT 1:57 A.M. * ASOS........................23 SSW AT 1:58 A.M. DAVIS.......................22 SSW AT 1:51 A.M. RMY N/A FASTEST MILE FOR YESTERDAY.....................16 SSW AT 1:48 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................18 SSW AT 2:11 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................17 S AT 1:50 A.M. AVERAGE WIND SPEED AND DIRECTION.............11.0 SW ASOS......................11.1 DAVIS.....................10.0 SW [215 Deg.] * Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.26 DEPARTURE......-1.40 ASOS..............2.09 TOTAL PRECIPITATION FOR THE YEAR..........19.20 DEPARTURE......-3.01 ASOS.............19.51 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE........0.0 TOTAL SNOWFALL FOR THE MONTH..............TRACE DEPARTURE........0.0 TOTAL SNOWFALL FOR THE SEASON..............57.5 DEPARTURE.......-5.7 PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system 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 5/1 52/39/46/-7/0.08/T/000/00 21 S AERO 22 SE RMY 20 5/2 50/41/46/-7/0.31/0.0/000/00 20 NE AERO 21 NE RMY 18 5/3 48/43/46/-7/0.16/0.0/000/00 16 E AERO 16 E RMY 17 5/4 48/41/45/-9/0.53/0.0/000/00 33 NE AERO 35 NE RMY 34 5/5 44/41/43/-11/0.30/0.0/000/00 39 NNE AERO 41 NNE RMY 39 5/6 54/43/49/-5/0.13/0.0/360/42 28 ENE AERO 29 N RMY 26 5/7 51/43/47/-8/.../0.0/000/00 25 NE AERO 25 NE RMY 23 5/8 60/46/53/-2/.../0.0/284/33 47 W AERO 53 W RMY 49 5/9 65/43/54/-1/0.00/0.0/743/86 40 W AERO 44 W RMY 40 5/10 69/40/55/0/0.00/0.0/806/93 22 W AERO 25 WNW RMY 22 5/11 76/50/63/+7/0.00/0.0/808/93 22 WNW AERO 23 WNW*RMY 22 5/12 75/54/65/+9/0.00/0.0/819/94 23 NNE AERO 25 S RMY 23 5/13 74/52/63/+7/0.21/0.0/079/09 27 S AERO 27 S RMY 26 5/14 78/54/66/+9/0.00/0.0/656/75 35 SSW*AERO 40 SSW RMY 37 5/15 60/41/51/-6/0.00/0.0/588/67 50 W AERO 54 W RMY 49 5/16 58/38/48/-9/0.00/0.0/800/91 45 W* AERO 51 WNW RMY 49 5/17 69/47/58/+1/0.00/0.0/344/39 32 W AERO 38 W RMY 38 5/18 64/48/56/-2/0.00/0.0/804/91 24 NE AERO 26 NNW RMY N/A 5/19 66/49/58/0/0.26/0.0/.../.. 23 WNW AERO 26 WNW RMY 25 5/20 73/46/60/+2/0.00/0.0/.../.. 20 SSE AERO 22 SSE RMY 21 5/21 74/53/64/+5/0.00.0.0/.../.. 21 S AERO 23 S RMY 21 5/22 64/53/59/0/T/0.0/.../.. 26 ENE AERO 29 ENE RMY 26 5/23 74/51/63/+4/T/0.0/.../.. 22 ENE AERO 31 ENE RMY N/A 5/24 56/50/53/-6/.../0.0/.../.. 30 ENE AERO 31 ENE RMY 29 5/25 86/51/69/+9/.../0.0/.../.. 25 W AERO 28 W RMY 25 5/26 86/64/75/+15/0.00/0.0/.../.. 21 SE AERO 23 SE RMY 21 5/27 81/60/71/+11/0.00/0.0/.../.. 26 S AERO 30 S RMY 29 5/28 92*/63/78/+17/0.00/0.0/.../.. 22 SSW AERO 22 SSW RMY N/A 5/29 low temp since midnight is 58F; normal low now 52F * Last of several occurrences * All sunshine data corrected to astronomical minutes. DAILY RECORDS FOR MAY 2016 5/1/16: DAILY RECORD SNOWFALL OF A TRACE, TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995 5/28/16: NEW HIGH DAILY RECORD MAXIMUM TEMP. OF 92F; PREVIOUS RECORD 90F IN 1914 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 29 HIGH 93F IN 1919 LOW 35F IN 1902 PRECIP 1.63 INS 1990 PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945 RECORDS FOR MAY 30 HIGH 93F IN 1929 LOW 39F IN 1949,1961 PRECIP 1.47 INS 1948 PEAK GUST 61e MPH NW IN 1945 TODAY'S REPORT PREPARED BY: Robert Skilling