BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, MAY 30, 2014 ALL TIMES ARE IN EASTERN STANDARD TIME TEMPERATURES RISE TO LOW 70'S AFTER COOL START Bright sunshine helped temperatures rise to the near normal 70-degree mark early this afternoon before a light sea breeze arrived. The morning low was quite cool at 45F or 7 degrees under the normal for the date. Today's Observations: 7 A.M. Weather: Thin scattered cirrus, few altocumulus south, altocumulus layer SW-NW, patches dense cirrus NNE-SSE Temperature: 52F; Dew Point: 44F; Wind: SSW at 7 kts Sea-level pressure: 30.09 ins. Hg, nearly steady Visibility: 25 miles, thin fog, hazy in all directions 6-hr max temp: 52F 6-hr min temp: 45F BHO SA 1155 250 –SCT 25 190/52/44/2007/009/ FEW AC S AC LYR XTDNG SW-NW PTCHS DNS CI NNE-SSE THN F HAZY/ 8/032 55002 10052 20045 10 A.M. Weather: Clear, lone cumulus fractus forming vicinity ENE, few cumulus, moderate cumulus forming distant W-NW, patch altocumulus/altocumulus lenticularis W, cirrus distant NE-SE Temperature: 64F; Dew Point: 48F; Wind: Calm, to light variable Sea-level pressure: 30.07 ins. Hg, falling slightly Visibility: 35 miles, except 45 miles WNW, distant haze BHO SA 1455 CLR 35 183/64/48/0000/007/ LONE CUFRA FRMG VC FEW CU/MDT CU FRMG DSNT W-NW FEW PATCH AC/ACSL W CI DSNT NE-SE VSBY WNW 45 DSNT HZ ALQDS WND LGT/ 8/241 58007 1 P.M. Weather: Scattered cumulus and moderate cumulus, scattered altocumulus generated by cumulus WSW-N, clear sky NE and distant E-SE, virga distant W-NW Temperature: 69F; Dew Point: 46F; Wind: ESE at 2 kts, estimated Sea-level pressure: 30.03 ins. Hg, falling then more rapidly Visibility: 30 miles, distant haze 6-hr max temp: 70F 6-hr min temp: 52f BHO SA 1755 60 SCT 70 SCT 30 169/69/46/E1102/003/ CU/MDT CU XCPT NE FEW CU OVHD ACCG MSTLY DSNT WSW-N VIRGA DSNT W-NW DSNT HZ/ 8/260 58014 10070 20052 WEATHER SUMMARY FOR THURSDAY, MAY 29, 2014 TEMPERATURE (DEGREES F) MAX.....61 NORMAL.....70 MIN.....39 NORMAL.....52 MEAN....50 NORMAL.....61 DEPARTURE FROM 30-YEAR NORMAL.........................-11 TOTAL DEPARTURE FOR THE MONTH.........................+43 [+1.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............15 DEPARTURE......... +9 TOTAL HEATING UNITS FOR THE MONTH.............206 DEPARTURE.........-52 TOTAL HEATING UNITS FOR THE SEASON...........6377 DEPARTURE.........+85 TOTAL HEATING UNITS LAST SEASON TO DATE......5734 DIFFERENCE.......+643 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............0 DEPARTURE..........-1 TOTAL COOLING UNITS FOR THE MONTH.............13 DEPARTURE..........-8 TOTAL COOLING UNITS FOR THE SEASON............13 DEPARTURE.........-10 TOTAL COOLING UNITS LAST SEASON TO DATE........6 DIFFERENCE.........+7 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................17 NNE AT 12:58 P.M. ASOS.......................17 ENE AT 11:08 A.M. DAVIS......................17 NNE AT 12:58 P.M. RMY 18 FASTEST MILE FOR YESTERDAY....................12 E AT 1:05 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................14 E AT 1:03 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................12 E AT 1:03 P.M. AVERAGE WIND SPEED AND DIRECTION..............8.4 N ASOS.......................8.4 DAVIS......................7.5 NE [050 deg] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.............-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.13 DEPARTURE.............-0.67 ASOS..............3.14 TOTAL PRECIPITATION FOR THE YEAR..........22.25 DEPARTURE.............-0.10 ASOS.............22.64 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE...............0.0 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE...............0.0 TOTAL SNOWFALL FOR THE SEASON..............85.6 DEPARTURE.............+22.9 PRELIMINARY CLIMATE SUMMARY FOR MAY 2014 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 64/43/54/+1/0.49/0.0/093/11 32 SSE RMY 36 5/2 68/51/60/+7/T/0.0/457/54 28 W RMY 29 5/3 66/48/57/+4/0.00/0.0/332/39 21 SW RMY N/A 5/4 60/47/54/0/0.01/0.0/400/47 51 WNW RMY 54 5/5 64/46/55/+1/T/0.0/592/70 30 NW RMY 32 5/6 63/42/53/-1/T/0.0/506/59 30 NW RMY 30 5/7 64/42/55/0/0.00/0.0/850/99 21 WNW RMY 23 5/8 69/48/59/+4/0.00/0.0/612/71 17 SSW RMY 19 5/9 57/51/54/-1/0.05/0.0/000/00 21 S RMY N/A 5/10 78/57/68/+13/0.10/0.0/043/05 33 S RMY 37 5/11 79/58/69/+13/0.01/0.0/746/86 30 W RMY N/A 5/12 85/49/67/+11/0.00/0.0/792/91 39 NE RMY 42 5/13 54/42/48/-8/0.00/0.0/113/13 32 NE RMY N/A 5/14 73/42/58/+1/T/ 0.0/613/70 22 S RMY 24 5/15 77/57/67/+10/T/0.0/140/16 27 S RMY 33 5/16 73/60/67/+10/0.26/0.0/026/03 36 S RMY 41 5/17 74/52/63/+6/1.04/0.0/555/63 36 SSE RMY N/A 5/18 67/47/57/-1/0.00/0.0/521/59 20 NW RMY N/A 5/19 65/48/56/-2/0.12/0.0/443/50 35 NNW RMY 38 5/20 71/48/60/+2/T/0.0/771/89 25 NNW RMY 26 5/21 71/51/61/+2/0.00/0.0/.../.. 18 ESE RMY 20 5/22 67/51/59/0/0.26/0.0/.../.. 15 SSE RMY 18 5/23 60/49/55/-4/0.05/0.0/.../.. 16 NE RMY 18 5/24 65/49/57/-2/0.02/0.0/.../.. 17 ENE RMY 18 5/25 71/49/60/0/0.00/0.0/.../.. 20 S RMY N/A 5/26 76/52/64/+4/0.05/0.0/.../.. 30 W RMY 34 5/27 74/47/61/+1/..../0.0/.../.. 25 NE RMY 31 5/28 48/40/44/-17/..../0.0/000/00 32 NE RMY 35 5/29 61/39/50/-11/0.00/0.0/.../.. 17 NNE RMY 18 5/30 morning low temp: 45F; the normal low is now 52F DAILY RECORDS FOR MAY 2014 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR MAY 31 HIGH 92F IN 1944,1987 LOW 35F IN 1961 PRECIP 5.02 INS 1984 (RECORD FOR MAY) PEAK GUST 54e MPH WNW IN 1945 TODAY'S REPORT PREPARED BY: Robert Skilling