BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, MAY 2, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDY START GIVES WAY TO CLEAR SKIES BUT BELOW NORMAL TEMPERATURES REMAIN AS 2015 ENTERS THE TOP TEN FOR LATEST 70-DEGREE READING As of the 1 o'clock observation, we have again reached over 60 degrees but look unlikely to reach 70. 2015 has entered the top ten once again by tying 1916 and 1919 for the tenth latest first 70 degree temperature reading. We anticipate that 2015 will move higher on the chart another day or two. This is the latest first 70-degree readnig since 1975. Overcast skies have given way to generally clear conditions but a persistent ocean fog has remained over the outer harbor. Inland, quiet conditions exist with very light winds and sunny skies for the remainder of the day. BHO Latest First 70-deg Temperature, (1885-2015) 1) 20 May, 1966 2) 19 May, 1917 3) 14 May, 1924 4) 11 May, 1975 5) 10 May, 1893 6) 7 May, 1971 7) 5 May, 1939 8) 3 May, 1937 3 May, 1904 10) 2 May, 1916 2 May, 1919 2 May, 2015 PRELIMINARY STATS FOR APRIL 2015 TEMPERATURE, Deg. F Avg. Max. 55.9 [+0.2] Avg. Min. 38.4 [+0.7] Mean 47.2 [+0.5] Corrected mean: 46.7 Max. for month: 69 on 4/13 Min. for month: 26 on 4/1 HEATING DEGREE DAYS Total heating units: 528 [-23] Total for the season: 6271 [+236] Total for last season: 6171 PRECIPITATION, Inches Total: 3.33 [-1.22] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: Trace [-3.0] Greatest in 24 hrs: Trace on 4/8 WIND, mph Avg. uncorrected wind speed: 12.6 Avg. corrected wind speed: 13.0 Prevailing wind direction: NW @ 16% Peak gust and direction: 54 NW on the 4th SUNSHINE: Astronomical total minutes: 12386 / 24083 or 51% Campbell-Stokes card minutes: 11946 / 23250 or 51% Today's Observations: 7 A.M. Weather: Overcast stratus with breaks, few stratocumulus all quadrants Temperature: 39F; Dew Point: 38F; Wind: NNE at an estimated 6 kts, Wind: Light Sea-level pressure: 30.02 ins. Hg, steady then increasing Visibility: 9 miles, except 6 mi E, 15 mi NW, 25 mi S 6-hr Max temp: 39F 6-hr Min temp: 35F 24-hr precip: 0.00 BHO SA 1155 E5 OVC 9 169/39/38/E5003/002/ FEW SC BINOVC ALQDS VSBY E 6 S 25 NW 15 HAZY SUN DMLY VSBL WND LGT/ 8/6// 53008 10039 20035 10 A.M. Weather: Clear, few stratus distant ENE-ESE, few cumulus distant E-S, few cirrus W-NW Temperature: 52F; Dew Point: 38F; Wind: NNE at 5 kts, Wind: Light Sea-level pressure: 30.02 ins. Hg, steady Visibility: 50 miles, except 10 ENE-ESE BHO SA 1455 CLR 50 167/52/38/2005/002/ FEW CU W-NW, SE-S FEW CI E-S FEW ST ENE-ESE VSBY 10 ENE-ESE HAZY WND LGT/ 8/605 55002 1 P.M. Weather: Clear, few stratus NE-ESE, few cumulus S-NW, few cirrus NWN and SE Temperature: 61F; Dew Point: 37F; Wind: ENE at 6 kts, Wind Light Sea-level pressure: 30.00 ins. Hg, steady then falling Visibility: 70 miles, except 50 mi NE-ESE light distant haze 6-hr Max temp: 61F 6-hr Min temp: 39F BHO SA 1755 CLR 70 159/61/37/7006/000/ FEW CU S-NW FEW S NE-ESE FEW CI WNW AND SE VSBY 50 NE-ESE HAZY WND LGT/ 8/562 58009 10061 20039 SUMMARY FOR FRIDAY, MAY 1, 2015 TEMPERATURE (DEGREES F) MAX.....52 NORMAL.....62 MIN.....37 NORMAL.....43 MEAN....45 NORMAL.....53 DEPARTURE FROM 30-YEAR NORMAL.......................-8 TOTAL DEPARTURE FOR THE MONTH.......................-8 [-8.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............20 DEPARTURE...........+7 TOTAL HEATING UNITS FOR THE MONTH..............20 DEPARTURE...........+7 TOTAL HEATING UNITS FOR THE SEASON...........6291 DEPARTURE.........+244 TOTAL HEATING UNITS LAST SEASON TO DATE......6182 DIFFERENCE........+109 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................21 NE AT 3:47 P.M. * ASOS.......................20 ENE AT 3:46 P.M. DAVIS......................19 NE AT 3:46 P.M. RMY 20 FASTEST MILE FOR YESTERDAY....................12 NE AT 3:53 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE.................14 E AT 4:08 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................14 E AT 8:36 A.M. AVERAGE WIND SPEED AND DIRECTION.............7.4 NE ASOS......................7.8 DAVIS.....................6.6 NE [059 degrees] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.....-0.12 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........0.00 DEPARTURE.....-0.12 ASOS...............0.00 TOTAL PRECIPITATION FOR THE YEAR...........17.92 DEPARTURE.....-0.62 ASOS................N/A *** *** ASOS annual totals not available due to erroneous readings 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..............150.8 DEPARTURE....+88.1 PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 4/1 44/26/35/-6/0.00/0.0/748/98 30 WNW RMY 31 4/2 59/29/44/+3/T/0.0/375/49 39 SSW RMY 43 4/3 56/47/52/+10/0.02/0.0/000/00 36 SW RMY N/A 4/4 49/32/41/-1/..../0.0/501/65 54 NW RMY 64 4/5 47/30/39/-4/..../0.0/464/60 40 W RMY 45 4/6 48/33/41/-2/0/00/0.0/544/70 18 NE RMY N/A 4/7 39/34/37/-6/..../0.0/000/00 21 NE RMY N/A 4/8 41/32/37/-7/..../T/000/00 30 ENE RMY 32 4/9 35/32/34/-10/..../0.0/000/00 31 ENE RMY 32 4/10 53/35/44/-1/..../0.0/000/00 31 SW RMY N/A 4/11 56/38/46/+1/0.00/0.0/744/94 39 WNW RMY 48 4/12 68/35/52/+7/0.00/0.0/762/96 23 WNW RMY 23 4/13 69/47/58/+12/0.00/0.0/764/96 35 SSW RMY N/A 4/14 65/51/58/+12/0.05/0.0/072/09 37 SSW RMY N/A 4/15 67/45/56/+9/0.00/0.0/786/98 32 NW RMY 33 4/16 64/42/53/+6/0.00/0.0/765/95 31 S RMY 21 4/17 64/45/55/+8/0.05/0.0/065/08 31 SSW RMY 32 4/18 64/43/54/+6/0.00/0.0/770/95 31 N RMY 36 4/19 55/39/47/-1/0.00/0.0/724/89 25 NNW RMY N/A 4/20 55/38/47/-2/..../0.0/000/00 36 SE RMY 40 4/21 67/51/59/+10/..../0.0/417/51 30 SSE RMY N/A 4/22 67/45/56/+7/0.03/0.0/632/77 44 SSW RMY 52 4/23 49/34/42/-8/0.00/0/0/362/44 32 W RMY N/A 4/24 50/32/41/-9/0.00/0.0/562/68 32 NW RMY 36 4/25 56/30/43/-7/0.00/0.0/638/77 26 NW RMY 29 4/26 54/39/47/-4/0.00/0.0/258/31 17 NW RMY N/A 4/27 56/42/49/-2/..../0.0/125/15 30 NW RMY N/A 4/28 63/39/51/-1/..../0.0/527/63 32 NW RMY 35 4/29 58/46/52/+0/T/0.0/461/55 24 ENE RMY 22 4/30 60/42/51/-1/0.00/0.0/320/38 21 NE RMY N/A PRELIMINARY CLIMATE SUMMARY FOR MAY 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/.../.. 21 NE RMY 20 5/2 low since midnight is 35 DAILY RECORDS FOR MAY 2015 NONE DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 2 HIGH 92F IN 2001 LOW 29F IN 1903 PRECIP 1.36 INCHES IN 2006 SNOWFALL 1.0 INS IN 1888 PEAK GUST 58 MPH S IN 1983 RECORDS FOR MAY 3 HIGH 92F IN 2001 LOW 31F IN 1888 PRECIP 2.25 INS IN 1900 SNOWFALL TRACE IN 1908, 1985 PEAK GUST 71 MPH W IN 2002 TODAY'S REPORT PREPARED BY: Robert Millette/Mike Iacono