BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL 22, 2017 ALL TIMES ARE IN EASTERN STANDARD TIME COLD AND DAMP WEATHER CONTINUES TODAY... The summit was shrouded in dense fog and drizzle early this morning, and this continued until rain showers arrived shortly after the 10 AM EST observation. Steady light rain began just before 12 PM EST and ended at 2 PM EST. A total of 0.06 inches of precipitation was measured for the six hours ending at the 1 PM EST observation. The temperature has remained chilly all day with a high of 43F and a low of 40F so far for today. During the steady rain, the dense fog began to lift and the visibility has increased to several miles by mid-afternoon. Today's Observations: 7 A.M. Weather: Light drizzle and dense fog Temperature: 41F; Dew Point: 41F; Wind: NNE at 10 kts, Sea-level pressure: 29.95 ins. Hg, rising then falling, now lower Visibility: 1/16 mile 6-hr Max temp: 42F 6-hr Min temp: 40F 24-hr precip: 0.33 in. 24-hr snowfall: 0.0 in. BHO SA 1155 W1 X 1/16L-F 142/41/41/0310/995/ 8//// 58004 60/// 70033 10042 20040 10 A.M. Weather: Light drizzle and dense fog, precipitation very light Temperature: 42F; Dew Point: 42F; Wind: NNW at 10 kts, Sea-level pressure: 29.96 ins. Hg, rising slightly Visibility: 1/8 mile 3-hr precip: Trace BHO SA 1455 W2 X 1/8L-F 145/42/42/3410/996/ PCPN VRY LGT/ 8//// 51003 6000/ 1 P.M. Weather: Light rain and fog Temperature: 43F; Dew Point: 43F; Wind: N at 7 kts Sea-level pressure: 29.93 ins. Hg, falling, then more quickly Visibility: 3 miles, variable 1/2 to 8 miles 6-hr Max temp: 43F 6-hr Min temp: 41F 6-hr precip: 0.06 inches BHO SA 1755 -X E3 OVC 3VR-F 135/43/43/3607/993/ F1 STFRA DRFTG BLO SMT ALQDS VSBY 1/2V8/ 8/72/ 58010 6006/ 10043 20041 SUMMARY FOR FRIDAY, APRIL 21, 2017 TEMPERATURE (DEGREES F) MAX.....45 NORMAL.....58 MIN.....42 NORMAL.....40 MEAN....44 NORMAL.....49 DEPARTURE FROM 30-YEAR NORMAL.........................-5 TOTAL DEPARTURE FOR THE MONTH........................+94 [+4.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............21 DEPARTURE..........+5 TOTAL HEATING UNITS FOR THE MONTH.............335 DEPARTURE.........-87 TOTAL HEATING UNITS FOR THE SEASON...........5237 DEPARTURE........-668 TOTAL HEATING UNITS LAST SEASON TO DATE......4864 DIFFERENCE.......+373 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................26 ESE AT 2:20 P.M. * AERO........................29 ESE AT 12:15 P.M. ASOS........................29 ESE AT 12:36 P.M. DAVIS.......................24 ESE AT 12:05 P.M. RMY 28 FASTEST MILE FOR YESTERDAY.....................22 ESE AT 12:07 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................22 ESE AT 12:07 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................19 ESE AT 12:07 P.M. AVERAGE WIND SPEED AND DIRECTION.............12.1 E ASOS......................11.5 DAVIS......................9.7 ESE [113 deg.] * LAST OF MULTIPLE OCCURRENCES PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.33 DEPARTURE......+0.20 ASOS..............0.38 TOTAL PRECIPITATION FOR THE MONTH..........4.97 DEPARTURE......+1.63 ASOS..............5.02 TOTAL PRECIPITATION FOR THE YEAR..........19.09 DEPARTURE......+1.75 ASOS...............N/A *** *** ASOS annual total 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................2.7 DEPARTURE........0.0 TOTAL SNOWFALL FOR THE SEASON..............66.4 DEPARTURE.......+4.0 PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 M: Missing data 4/1 35/31/33/-8/2.21/2.7/000/00 40 ENE AERO 41 ENE RMY 41 4/2 53/30/42/+1/0.00/0.0/552/72 32 NW AERO 33 NW RMY 34 4/3 60/35/48/+6/0.00/0.0/685/89 21 W* AERO 20 NW RMY N/A 4/4 42/35/39/-3/0.78/0.0/000/00 41 ESE AERO 43 ESE RMY 42 4/5 41/35/38/-5/0.00/0.0/000/00 21 NNW AERO 20 NNW RMY N/A 4/6 55/35/45/+2/1.27/0.0/000/00 35 SSE AERO 37 S RMY 37 TSTM 4/7 53/38/46/+3/0.00/0.0/226/29 43 SSW AERO 47 SSW RMY 48 4/8 50/34/42/-2/0.00/0.0/666/85 37 WNW AERO 40 WNW RMY 39 4/9 65/34/50/+6/0.00/0.0/716/91 23 W AERO 23 W RMY N/A 4/10 77/45/61/+16/0.00/0.0/560/71 37 S AERO 37 S RMY 39 4/11 85/50/68/+23/0.00/0.0/642/81 28 S AERO 28 S RMY 30 4/12 68/47/58/+13/0.01/0.0/.../.. 26 WNW AERO 28 WNW RMY N/A 4/13 58/39/49/+3/0.00/0.0/.../.. 28 WNW AERO 31 NW RMY 30 4/14 62/40/51/+5/0.00/0.0/.../.. 22 NNW AERO 22 NNW RMY 24 4/15 68/40/54/+7/0.01/0.0/.../.. 40 SSW AERO 45 SSW RMY 45 4/16 86/55/71/+24/T/0.0/.../.. 38 W* AERO 39 SW RMY 42 4/17 75/48/62/+15/0.00/0.0/.../.. 37 W AERO 37 W RMY 43 4/18 52/35/44/-4/0.00/0.0/.../.. 25 ENE AERO 23 ENE RMY 25 4/19 54/34/44/-4/..../0.0/.../.. 31 S AERO 33 S RMY 34 4/20 58/42/50/+1/..../0.0/.../.. 25 SSW AERO 24 SSW RMY 23 4/21 45/42/44/-5/..../0.0/000/00 26 ESE AERO 29 ESE RMY 28 4/22 Low temp since midnight is 40F; normal low is now 40F DAILY RECORDS FOR APRIL 2017 4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F, BREAKS PREVIOUS RECORD OF 78F SET IN 1945 4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F, TIES WITH PREVIOUS RECORD SET IN 1955 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 22 HIGH 85 IN 1977, 2001 LOW 26 IN 1981 PRECIP 1.85 IN. IN 2000 SNOWFALL 3.0 IN. IN 1940 PEAK GUST 68e MPH NW IN 1945 RECORDS FOR APRIL 23 HIGH 85 IN 1908, 2007 LOW 25 IN 1933,1989 PRECIP 1.99 IN. IN 2012 SNOWFALL 2.0 IN. IN 2012 PEAK GUST 64 MPH WNW IN 1962 TODAY'S REPORT PREPARED BY: Mike Iacono