BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, MAY 3, 2014 ALL TIMES ARE IN EASTERN STANDARD TIME SUNSHINE THIS MORNING REPLACED BY CLOUDS THIS AFTERNOON... The temperature has again climbed above the average for early May into the middle 60s after a low of 48F this morning. Partial sunshine earlier this morning has mostly vanished as building moderate cumulus have spread out into a layer of stratocumulus with just a few breaks visible. Nearly clear conditions are still visible in the distance from the NW to the SSW at early afternoon. The winds have been generally light with an occasional sea-breeze forming along the coast. APRIL 2014 PRELIMINARY STATISTICS [Departures are relative to the 1981-2010 averages] TEMPERATURE: Deg. F Avg. Max. 55.9 [+0.2] Avg. Min. 37.5 [-0.2] Mean 46.7 [0.0] 24-hr. corrected mean: 46.1 Max. temp: 73 on the 14th Min. temp: 28 on the 16th and 18th Total heating degree day units: 544 [-7] Total seasonal heating units: 6,171 [+136] [Season starts 7/1] Seasonal total this date 2012: 5,522 [+649] PRECIPITATION: Inches Total: 4.00 [-0.55] Greatest in 24 hours: TBD Total snowfall: 0.8 inches Greatest in 24 hours: 0.8 inches on the 16th WIND Av. speed (uncorrected): 13.6 mph Av. speed (corrected): 13.9 mph Prevailing direction: NW @ 13% possible SUNSHINE Total astronomical minutes: 11,946 of possible 24,094 or 50% Total Campbell-Stokes card minutes; 11,508 of possible 23,250 or 49% Today's Observations: 7 A.M. Weather: Broken altocumulus, few cumulus distant ESE Temperature: 54F; Dew Point: 38F; Wind: WSW at 6 kts, Wind: Light Sea-level pressure: 29.87 ins. Hg, rising Visibility: 70 miles, light distant haze 6-hr max temp: 54F 6-hr min temp: 48F 24-hr precip: 0.00 in. BHO SA 1155 E90 –BKN 70 116/54/38/2506/987/ FEW CU DSNT ESE LGT DSNT HZ WND LGT/ 8/150 51010 10054 20048 10 A.M. Weather: Scattered cumulus, broken altocumulus, moderate cumulus forming all quadrants Temperature: 61F; Dew Point: 39F; Wind: SSW at 5 kts, Wind: Light Sea-level pressure: 29.85 ins. Hg, falling Visibility: 70 miles, light distant haze BHO SA 1455 50 SCT E90 BKN 70 107/61/39/2005/985/ MDT CU FRMNG ALQDS LGT DSNT HZ WND LGT/ 8/250 58009 1 P.M. Weather: Scattered cumulus, broken stratocumulus formed from spreading out of cumulus, few moderate cumulus, breaks in overcast all quadrants, clearing distant NE-SSW Temperature: 63F; Dew Point: 35F; Wind: SSW at 10 kts Sea-level pressure: 29.79 ins. Hg, falling Visibility: 75 miles 6-hr max temp: 65F 6-hr min temp: 54F BHO SA 1755 55 SCT E75 BKN 100 OVC 75 087/63/35/2010/979/ SCCG ALQDS FEW MDT CU BINOVC ALQDS CLRNG DSNT NE-SSW/ 8/45/ 56020 10065 20054 WEATHER SUMMARY FOR FRIDAY, MAY 2, 2014 TEMPERATURE (DEGREES F) MAX.....68 NORMAL.....62 MIN.....51 NORMAL.....44 MEAN....60 NORMAL.....53 DEPARTURE FROM 30-YEAR NORMAL.........................+7 TOTAL DEPARTURE FOR THE MONTH.........................+8 [+3.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............5 DEPARTURE..........-7 TOTAL HEATING UNITS FOR THE MONTH..............16 DEPARTURE..........-9 TOTAL HEATING UNITS FOR THE SEASON...........6187 DEPARTURE........+127 TOTAL HEATING UNITS LAST SEASON TO DATE......5537 DIFFERENCE.......+650 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................28 W AT 3:15 P.M. * AERO.......................N/A ASOS.......................30 W AT 3:15 P.M. DAVIS......................29 W AT 3:15 P.M. RMY 29 FASTEST MILE FOR YESTERDAY....................22 W AT 3:13 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................22 WSW AT 3:15 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................20 WSW AT 3:15 P.M. AVERAGE WIND SPEED AND DIRECTION............11.4 W ASOS.....................10.4 DAVIS.....................9.5 WNW [285 deg] * 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..........0.49 DEPARTURE.............+0.25 ASOS..............0.51 TOTAL PRECIPITATION FOR THE YEAR..........19.61 DEPARTURE.............+0.82 ASOS.............20.04 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 APRIL 2014 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO 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 4/1 48/31/40/-1/0.00/0.0/694/91 29 NNE AERO N/A RMY N/A 4/2 56/34/45/+4/0.00/0.0/452/59 22 WSW AERO 20 MPH WSW RMY N/A 4/3 55/36/46/+4/0.00/0.0/707/92 23 NNW AERO 22 MPH NW RMY 25 4/4 47/35/41/-1/0.31/0.0/255/33 26 ESE AERO N/A RMY 25 4/5 51/33/42/-1/0.19/0.0/186/24 39 WNW AERO N/A RMY 40 4/6 58/29/44/+1/0.00/0.0/755/97 25 W AERO N/A RMY N/A 4/7 59/44/52/+9/0.05/0.0/187/24 28 SSE AERO N/A RMY N/A 4/8 62/41/52/+8/0.61/0.0/016/02 45 W AERO N/A RMY 44 4/9 60/36/48/+4/0.00/0.0/707/90 35 NW AERO N/A RMY 36 4/10 57/33/45/0/0.00/0.0/742/94 38 S AERO N/A RMY 39 4/11 70/45/58/+13/T/0.0/111/14 32 S AERO N/A RMY N/A 4/12 68/44/56/+11/0.00/0.0/699/88 28 W AERO N/A RMY 28 4/13 65/45/55/+10/0.04/0.0/215/27 35 S AERO N/A RMY N/A 4/14 73/55/64/+18/0.00/0.0/296/37 55 SW AERO N/A RMY 62 4/15 66/38/52/+5/1.22/0.0/000/00 62 S AERO N/A RMY 68 4/16 43/28/36/-11/0.43/0.8/757/94 39 NNW AERO N/A RMY 39 4/17 39/29/34/-13/T/T/566/70 35 NE AERO N/A RMY 34 4/18 42/28/35/-13/0.00/0.0/016/02 25 E AERO N/A RMY 25 4/19 62/35/49/1/0.00/0.0/732/90 31 NW AERO N/A RMY 32 4/20 52/36/44/-5/0.00/0.0/783/96 21 E AERO N/A RMY 22 4/21 67/36/52/+3/0.00/0.0/778/95 25 SSW AERO N/A RMY 26 4/22 72/44/58/+9/0.07/0.0/427/52 32 S AERO N/A RMY 33 4/23 52/43/48/-2/0.27/0.0/0/0 47 NW AERO N/A RMY 47 TSTM 4/24 56/38/47/-3/0.00/0.0/810/98 52 NW AERO N/A RMY 54 4/25 64/39/52/+2/0.00/0.0/721/87 25 S AERO N/A RMY 25 4/26 44/39/42/-9/..../0.0/0/0 18 E AERO N/A RMY 18 4/27 46/38/42/-9/..../0.0/8/1 21 NW AERO N/A RMY 23 4/28 56/36/46/-6/T/0.0/326/39 31 ENE AERO N/A RMY 33 4/29 42/38/40/-12/T/0.0/0/0 32 ENE AERO N/A RMY 35 4/30 44/38/41/-11/0.37/0.0/0/0 25 ESE AERO N/A RMY N/A 5/1 64/43/54/+1/0.49/0.0/.../.. 32 SSE RMY 36 5/2 68/51/60/+7/T/0.0/.../.. 28 W RMY 29 5/3 morning low temp: 48F; the normal low is now 44F DAILY RECORDS FOR APRIL 2014 4/14 - Minimum temperature of 55F EQUALS RECORD HIGH MINIMUM FOR THIS DATE SET IN 1909. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR MAY 4 HIGH 90F IN 2001 LOW 27F IN 1911 (RECORD FOR MAY) PRECIP 1.92 INCHES IN 1893 SNOWFALL 0.1 INCHES IN 1920 PEAK GUST 60 MPH NW IN 1966 TODAY'S REPORT PREPARED BY: Mike Iacono