BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JUNE 4, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDY AND COOL CONDITIONS PERSIST, SLOW WARM UP ON THE WAY Mostly cloudy skies yesterday had difficulty clearing, with the mercury unable to reach the 60F degree mark. Cloudy conditions persisted overnight as temperatures dropped to a minimum of 46F, some 8 degree below the daily norm. By the 1:00 PM EST observation skies have begun to clear with a sea breeze beginning to reduce the cloud cover. A maximum temperature of 62F had been recorded by this time. BHO Warmest Mays, deg F (1885-2015) 1) 61.5 in 2015 2) 61.4 in 1991 3) 61.0 in 1944 4) 60.9 in 2010 5) 59.4 in 1911 59.4 in 1959 PRELIMINARY STATS FOR MAY 2015 TEMPERATURE, Deg. F Avg. Max. 74.6 [+8.3] Avg. Min. 49.7 [+1.9] Mean 62.2 [+5.1] Corrected mean: 61.5 Max. for month: 88 on 5/10 Min. for month: 35 on 5/2 HEATING DEGREE DAYS Total heating units: 133 [-135] Total for the season: 6404 [+101] Total for last season: 6394 COOLING DEGREE DAYS Total cooling units: 49 [+27] Total for the season: 49 [+25] Total for last season: 13 PRECIPITATION, Inches Total: 1.45 [-2.66] Greatest in 24 hrs: 1.07, 2:00 PM EST on 5/31 thru 1:59 PM EST on 6/1 SNOWFALL, Inches Total: None Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 12.2 Avg. corrected wind speed: 12.6 Prevailing wind direction: SSW @ 23% Peak gust and direction: 40 NE on the 31st SUNSHINE: Astronomical total minutes: 17534 / 27166 or 65% Campbell-Stokes card minutes: 16950 / 26226 or 65% Today's Observations: 7 A.M. Weather: Broken stratocumulus, few cumulus distant E-SSW Temperature: 52F; Dew Point: 43F; Wind: estimated SSE at 4 kts Wind Speed: Light Sea-level pressure: 30.34 ins. Hg, rising, then more quickly Visibility: 60 miles, except 80 miles E-WSW 6-hr Max temp: 52F 6-hr Min temp: 46F 24-hr precip: none BHO SA 1155 E35 BKN 60 275/52/43/E1604/034/ VSBY E-WSW 80 MI FEW CU DSNT E-SSW WND LGT/ 8/500 53008 10052 20046 10 A.M. Weather: Broken stratocumulus, few cumulus in all directions Temperature: 58F; Dew Point: 46F; Wind: estimated SE at 2 kts Wind Speed and Direction: Light and Variable Sea-level pressure: 30.34 ins. Hg, about the same Visibility: 60 miles BHO SA 1455 E35 BKN 60 274/58/46/E1402/034/ FEW CU ALQDS WND LGT AND VRB/ 8/800 58001 1 P.M. Weather: Scattered stratocumulus Temperature: 60F; Dew Point: 45F; Wind: ENE at 7 kts Sea-level pressure 30.31 ins. Hg, falling, then more slowly Visibility: 60 miles 6-hr Max temp: 62F 6-hr Min temp: 51F 6-hr precip: none BHO SA 1755 60 SCT 60 264/60/45/0707/031/ 8/500 56010 10062 20051 SUMMARY FOR WEDNESDAY, JUNE 3, 2015 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....71 MIN.....44 NORMAL.....53 MEAN....52 NORMAL.....62 DEPARTURE FROM 30-YEAR NORMAL.......................-10 TOTAL DEPARTURE FOR THE MONTH.......................-41 [-13.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............13 DEPARTURE...........+9 TOTAL HEATING UNITS FOR THE MONTH..............50 DEPARTURE..........+36 TOTAL HEATING UNITS FOR THE SEASON...........6454 DEPARTURE.........+137 TOTAL HEATING UNITS LAST SEASON TO DATE......6399 DIFFERENCE.........+55 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............0 DEPARTURE..........-2 TOTAL COOLING UNITS FOR THE MONTH..............0 DEPARTURE..........-5 TOTAL COOLING UNITS FOR THE SEASON............49 DEPARTURE.........+20 TOTAL COOLING UNITS LAST SEASON TO DATE.......19 DIFFERENCE........+30 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................16 ESE AT 7:18 P.M. ASOS.......................17 ESE AT 8:13 P.M. DAVIS......................15 ESE AT 7:17 P.M. RMY 16 FASTEST MILE FOR YESTERDAY....................12 ESE AT 8:17 P.M.* MAXIMUM 2-MINUTE ASOS AVERAGE.................13 ESE AT 8:17 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................11 ESE AT 8:14 P.M. AVERAGE WIND SPEED AND DIRECTION..............5.7 NE ASOS.......................6.3 DAVIS......................5.0 ENE [065 deg.] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE....-0.16 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........1.49 DEPARTURE....+1.00 ASOS...............1.51 TOTAL PRECIPITATION FOR THE YEAR.......... 20.86 DEPARTURE....-2.16 ASOS...............N/A *** *** ASOS annual totals not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR MAY-JUNE CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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 5/1 52/37/45/-8/0.00/0.0/354/42 21 NE RMY 20 5/2 63/35/49/-4/0.00/0.0/668/79 20 S RMY 20 5/3 74/44/59/+6/0.00/0.0/509/60 22 S RMY 22 5/4 83/47/65/+11/0.00/0.0/783/92 39 SSW RMY 45 5/5 77/56/67/+13/0.03/0.0/222/26 29 SW RMY N/A 5/6 74/54/64/+10/0.00/0.0/574/67 24 SSW RMY 25 5/7 84/52/68/+13/0.00/0.0/824/96 29 S RMY 32 5/8 74/44/59/+4/0.00/0.0/809/94 27 NNE RMY 26 5/9 77/44/61/+6/0.00/0.0/509/59 30 S RMY 32 5/10 88/60/74/+19/0.00/0.0/692/80 28 SSW RMY 30 5/11 84/48/66/+10/0.00/0.0/529/61 30 NE RMY 31 5/12 84/47/66/+10/0.24/0.0/287/33 33 WNW RMY 37 5/13 67/47/57/+1/0.00/0.0/820/94 31 WNW RMY N/A 5/14 70/44/57/+0/0.00/0.0/848/97 22 NW RMY 22 5/15 73/51/62/+5/0.00/0.0/491/56 20 WSW RMY 21 5/16 68/53/61/+4/T/0.0/053/06 23 S RMY 24 5/17 79/50/65/+8/T/0.0/783/89 21 NE RMY N/A 5/18 62/48/55/-3/0.00/0.0/538/61 25 NE RMY N/A 5/19 63/50/57/-1/0.36/0.0/000/00 24 S RMY 26 5/20 66/46/56/-2/0.00/0.0/753/85 32 WNW RMY 37 5/21 66/43/55/-4/0.00/0.0/461/52 24 S RMY 24 5/22 73/49/61/+2/T/0.0/711/80 32 NW RMY 36 5/23 64/40/52/-7/0.00/0.0/855/96 28 WNW RMY 32 5/24 81/50/66/+7/0.00/0.0/750/84 28 SSW RMY 31 5/25 80/56/68/+8/0.00/0.0/232/26 29 SSW RMY 31 5/26 83/61/72/+12/0.00/0.0/591/66 30 SSW RMY N/A 5/27 82/62/72/+12/T/0.0/727/81 36 SSW RMY 41 5/28 83/61/72/+11/0.00/0.0/548/61 30 SSW RMY 34 5/29 77/58/68/+7/0.00/0.0/828/92 18 ENE RMY 19 5/30 85/55/70/+9/0.00/0.0/704/78 37 SSW RMY 42 5/31 78/46/62/+1/0.82/0.0/081/09 40 NE RMY 43 TSTM 6/1 48/46/47/-15/0.69/0.0/000/00 32 NE RMY 34 6/2 47/44/46/-16/..../0.0/000/00 28 NNE RMY 28 6/3 59/44/52/-10/0.00/0.0/.../.. 16 ESE RMY 16 6/4 low since midnight is 46F; normal low is now 54F DAILY RECORDS FOR MAY 2015 None. 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 4 HIGH 99F IN 1919 [Record for month] LOW 41F IN 1915,1926 PRECIP 1.52 INS IN 2007 PEAK GUST 48 MPH SSE IN 1983 RECORDS FOR JUNE 5 HIGH 95F IN 1930 LOW 41F IN 1891 PRECIP 2.83 INS IN 1982 PEAK GUST 57 MPH NNW IN 1988 TODAY'S REPORT PREPARED BY: Brian Fitzgerald