BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JUNE 4, 2016 ALL TIMES ARE IN EASTERN STANDARD TIME PARTLY SUNNY SKY WITH MODERATE HUMIDITY AND INCREASING CLOUDS THIS AFTERNOON... Thin fog reduced the visibility to less than six miles early this morning, and the minimum temperature was 61F back at midnight. Dew points were in the low 60s to start the day, though these dropped slightly into the upper 50s by afternoon. After the fog and low stratus burned off, a veil of high cirrus and cirrostratus advanced across the sky. Later in the morning small cumulus began to form, and these are becoming more numerous this afternoon. The fog bank remained visible over the harbor to the NE during the morning. Light and variable winds from the NW turned around to the east at 12:30 PM EST as a weak sea-breeze moved in at the Observatory. PRELIMINARY STATS FOR MAY 2016 TEMPERATURE, Deg. F Avg. Max. 66.9 [+0.6] Avg. Min. 48.8 [+1.0] Mean 57.9 [+0.8] 24-hour corrected mean: 57.2 Max. for month: 92 on 28th Min. for month: 38 on 16th HEATING DEGREE DAYS Total heating units: 256 [-12] Total for the season: 5248 [-1055] Total for last season: 6404 COOLING DEGREE DAYS Total cooling units: 45 [+23] Total for the season: 48 [+24] Total for last season: 49 PRECIPITATION, Inches Total: 3.13 [-0.98] Greatest in 24 hrs: 0.94 in. on 30th SNOWFALL, Inches Total: T [0.0] Greatest in 24 hrs: T on 1st WIND, mph Avg. uncorrected wind speed: 10.7 Avg. corrected wind speed: 11.3 Prevailing wind direction: W at 15% Peak gust and direction: 50 W on 15th SUNSHINE: Campbell-Stokes card minutes: 12390 mins. of possible 26226 or 47% Astronomical total minutes: 12842 mins. of possible 27208 or 47% Today's Observations: 7 A.M. Weather: Overcast stratus, fog Temperature: 64F; Dew Point: 62F; Wind: NNW at 5 kt, Wind: Light Sea-level pressure: 30.02 ins. Hg, rising then more quickly Visibility: 5 miles 6-hr Max temp: 64F 6-hr Min temp: 61F 24-hr precip: 0.00 in. BHO SA 1155 E4 OVC 5F 165/64/62/3305/002/ WND LGT/ 8/6// 53010 10064 20061 10 A.M. Weather: Thin scattered cirrus, few cumulus distant SE-NW, few cumulus fractus vicinity station, few lower dense cirrus Temperature: 74F; Dew Point: 62F; Wind: NNW at 4 kts, Wind: Light and variable Sea-level pressure: 30.01 ins. Hg, falling Visibility: 30 miles, visibility NE 20, hazy 3-hr precip: 0.00 in. BHO SA 1455 250 -SCT 30 164/74/62/3304/001/ FEW CU DSNT SE-NW FEW CUFRA VCNTY STN FEW LWR DNS CI VSBY NE 20 HAZY WND LGT AND VRB/ 8/101 58001 1 P.M. Weather: Scattered cumulus, overcast cirrostratus and cirrus, few lower dense cirrus, S-SW, thin spots in overcast overhead-SW, fog bank offshore NE Temperature: 79F; Dew Point: 59F; Wind: E at 5 kts Sea-level pressure: 29.98 ins. Hg, falling, then more quickly Visibility: 30 miles, visibility NE 15, hazy 6-hr Max temp: 81F 6-hr Min temp: 64F 6-hr precip: 0.00 in. BHO SA 1755 40 SCT 200 OVC 30 153/79/59/0905/998/ FEW LWR DNS CI S-SW THN SPTS IOVC OVHD-SW VSBY NE 15 FG BNK OFFSHR NE HAZY WND LGT AND VRB/ 8/108 58011 10081 20064 SUMMARY FOR FRIDAY, JUNE 3, 2016 TEMPERATURE (DEGREES F) MAX.....70 NORMAL.....71 MIN.....57 NORMAL.....53 MEAN....64 NORMAL.....62 DEPARTURE FROM 30-YEAR NORMAL.........................+2 TOTAL DEPARTURE FOR THE MONTH.........................+2 [+0.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............1 DEPARTURE..........-3 TOTAL HEATING UNITS FOR THE MONTH...............7 DEPARTURE..........-7 TOTAL HEATING UNITS FOR THE SEASON...........5255 DEPARTURE.......-1062 TOTAL HEATING UNITS LAST SEASON TO DATE......6454 DIFFERENCE......-1199 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.............48 DEPARTURE.........+19 TOTAL COOLING UNITS LAST SEASON TO DATE........49 DIFFERENCE.........-1 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................16 SSW AT 9:18 P.M. ASOS........................16 SSW AT 9:28 P.M. DAVIS.......................15 SSW AT 9:17 P.M. RMY 16 FASTEST MILE FOR YESTERDAY.....................13 SSW AT 9:18 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................14 SSW AT 9:22 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................13 SSW AT 9:21 P.M. AVERAGE WIND SPEED AND DIRECTION..............6.7 SSW ASOS.......................6.3 DAVIS......................5.6 S [188 Deg.] * Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace DEPARTURE......-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH.........Trace DEPARTURE......-0.49 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........20.07 DEPARTURE......-3.08 ASOS.............20.44 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/-9/0.46/0.0/000/00 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/-8/0.06/0.0/000/00 25 NE AERO 25 NE RMY 23 5/8 60/46/53/-2/0.10/0.0/284/33 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/T/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 66/49/58/0/0.26/0.0/283/32 23 WNW AERO 26 WNW RMY 25 5/20 73/46/60/+2/0.00/0.0/798/90 20 SSE AERO 22 SSE RMY 21 5/21 74/53/64/+5/0.00/0.0/587/66 21 S AERO 23 S RMY 21 5/22 64/53/59/0/T/0.0/320/36 # 26 ENE AERO 29 ENE RMY 26 5/23 74/51/63/+4/T/0.0/491/55 22 ENE AERO 31 ENE RMY N/A 5/24 56/50/53/-6/0.12/0.0/000/00 30 ENE AERO 31 ENE RMY 29 TSTM 5/25 86/51/69/+9/0.00/0.0/635/71 25 W AERO 28 W RMY 25 5/26 86/64/75/+15/0.00/0.0/610/68 21 SE AERO 23 SE RMY 21 5/27 81/60/71/+11/0.00/0.0/548/61 26 S AERO 30 S RMY 29 5/28 92/63/78/+17/0.00/0.0/711/79 22 SSW AERO 22 SSW RMY N/A 5/29 72/51/62/+1/0.00/0.0/009/01 18 NE AERO 20 NE RMY 18 5/30 71/52/62/+1/0.94/0.0/009/01 # 25 SSW AERO 28 SSW RMY 27 5/31 84/67/76/+15/0.00/0.0/750/83 25 W AERO 29 WSW RMY 28 6/1 71/54/63/+1/0.00/.../.. 26 NE AERO 30 NE RMY N/A 6/2 68/54/61/-1/0.00/.../.. 28 NE AERO 22 NE RMY 21 6/3 70/57/64/+2/T/.../.. 16 SSW AERO 17 SSW RMY 16 6/3 low temp since midnight is 57F; normal low now 53F * Last of several occurrences # Sunshine data corrected on the 22nd and 30th. 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: DAILY RECORD MAXIMUM TEMP. OF 92F, PREVIOUS RECORD OF 90F SET IN 1914 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: Mike Iacono