BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, APRIL 16, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME FAIR WEATHER AND BREEZY WITH GOOD VISIBILITY ATOP GREAT BLUE HILL.... Rainfall since the 7 A.M. observation yesterday amounted to 0.16 inches, which included the convective patches of rain yesterday afternoon. Visibility has been excellent  today, being almost 85 miles on average. Despite unhindered sunlight, temperatures remain below normal throughout the  day due to significant cold air advection from the west.  Wind has remained westerly, with an average speed of 23 mph and a max gust so far today of 45 mph. The high temperature  so far today is 55F, a degree below our normal maximum  temperature of 56F. The low since midnight is 37F, a  degree below our normal minimum temperature of 38F.    PRELIMINARY STATS FOR MARCH 2019 TEMPERATURE, Deg. F Avg. Max. 44.0 [-0.3] Avg. Min. 26.1 [-0.5] Mean      35.1 [-0.4] 24-hour corrected mean: 34.7 Max. for month: 67F on the 30th Min. for month: 6F  on the 7th HEATING DEGREE DAYS Total heating units:    919  [+3] Total for the season:  5404 [-80] Total for last season: 5058 PRECIPITATION, Inches Total: 4.08 [-1.50] Greatest in 24 hrs: 1.82 ins. on the 3rd-4th SNOWFALL, Inches Total: 23.1 [+10.4] Greatest in 24 hrs: 15.8 ins. on the 3rd-4th  WIND, mph Avg. uncorrected wind speed: 13.2 Avg. corrected wind speed: 13.5 Prevailing wind direction: W at 20% Peak gust and direction: 53 S on 31st   SUNSHINE: Campbell-Stokes card minutes: 12612 minutes of possible 21516 or 59% Astronomical total minutes:   13031 minutes of possible 22220 or 59%   Today's Observations: 7 A.M. Weather: Scattered cumulus  Temperature: 40F; Dew Point: 22F; Wind: WNW at 22G32 kts, Peak wind: 41 MPH (36 kts) WNW at 5:48 A.M. Sea-level pressure: 29.79 ins. Hg, rising steadily Visibility: 80 miles 6-hr Max temp: 40F 6-hr Min temp: 37F 24-hr Precip:  0.16 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins.  BHO SA 1155 40 SCT 80 089/40/22/2922G32/979/ PK WND 2936/1048/  8/100 70016 51034 10040 20037  10 A.M. Weather: Scattered cumulus Temperature: 48F; Dew Point: 25F; Wind: WNW at 21G33 kts, Peak wind: 41 MPH (36 kts) WNW at 8:45 A.M Sea-level pressure: 29.83 ins. Hg, rising, then more quickly Visibility: 85 miles 3-hr Precip: 0.00 ins. BHO SA 1455 40 SCT 85 102/48/25/2921G33/983/ PK WND 2936/1345/  8/100 51013   1 P.M. Weather: Scattered cumulus Temperature: 55F; Dew Point: 27F; Wind: WNW at 15G28 kts Sea-level pressure: 29.84 ins. Hg, rising steadily Visibility: 85 miles 6-hr Max temp: 55F 6-hr Min temp: 40F 6-hr Precip:  0.00 ins. 6-hr snowfall: 0.0 ins.  BHO SA 1755 40 SCT 85 105/55/27/2915G28/984/ PK WND 2937/1615/  8/100 53003 10055 20040 SUMMARY FOR MONDAY, APRIL 15, 2019  TEMPERATURE (DEGREES F) MAX.....67   NORMAL.....56 MIN.....40   NORMAL.....38 MEAN....54   NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL........................+7 TOTAL DEPARTURE FOR THE MONTH.......................+28 [+1.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............11   DEPARTURE.........-7 TOTAL HEATING UNITS FOR THE MONTH.............291   DEPARTURE........-28 TOTAL HEATING UNITS FOR THE SEASON...........5696   DEPARTURE.......-106 TOTAL HEATING UNITS LAST SEASON TO DATE......5439   DIFFERENCE......+257 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................46 W   AT  7:00 P.M.                    AERO.........................52 W   AT  6:58 P.M.                    ASOS.........................50 WNW AT  7:06 P.M.                     DAVIS........................50 WSW AT  6:59 P.M.  RMY 50 FASTEST MILE FOR YESTERDAY......................36 WNW AT  7:06 P.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................35 WNW AT  7:06 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................37 WSW AT  7:06 P.M. AVERAGE WIND SPEED AND DIRECTION.............19.6 WNW                    ASOS......................18.6                     DAVIS.....................19.3 SW [219 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16  DEPARTURE.......+0.01                          ASOS..............0.16 TOTAL PRECIPITATION FOR THE MONTH..........2.84  DEPARTURE.......+0.33                          ASOS..............2.74 TOTAL PRECIPITATION FOR THE YEAR..........15.88  DEPARTURE.......-0.63                          ASOS.............15.89 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0  DEPARTURE........-0.1 TOTAL SNOWFALL FOR THE MONTH.............TRACE  DEPARTURE........-2.2 TOTAL SNOWFALL FOR THE SEASON.............47.6  DEPARTURE.......-14.3 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 03/01 38/17/28/-3/0.00/0.0/479/71           16 NNW AERO 13 NNW RMY 22 03/02 31/27/29/-2/0.48/4.2/000/00           29 NNE AERO 22 NNE RMY 30 03/03 40/25/33/+1/0.12/1.5/367/54           21 ESE AERO 14 ESE RMY N/A 03/04 35/18/27/-5/1.70/14.3/130/19          33 W   AERO 18 W   RMY 32 03/05 29/10/20/-12/0.00/0.0/664/97          28 WNW AERO 12 SW  RMY N/A 03/06 24/10/17/-15/0.00/0.0/667/97          40 WNW AERO 25 WNW RMY 41 03/07 26/6/16/-17/0.00/0.0/359/52           35 W   AERO 18 W   RMY 34 03/08 35/11/23/-10/0.00/0.0/555/80          23 WSW AERO M  M   RMY M  03/09 43/22/33/0/0.00/0.0/683/98            20 WSW AERO M  M   RMY N/A 03/10 40/26/33/0/0.53/1.0/000/00            32 ESE AERO 23 S   RMY 32 03/11 48/33/41/+7/0.00/0.0/555/79           40 NW  AERO 37 NNW RMY 41 03/12 41/27/34/0/0.00/0.0/494/70            32 N   AERO 33 N   RMY 34 03/13 43/24/34/0/0.00/0.0/404/57            18 W   AERO 21 W   RMY 23 03/14 48/32/40/0/0.00/0.0/121/17            25 S   AERO 28 S   RMY M 03/15 58/40/49/+14/0.12/0.0/000/00          37 SSW AERO 38 SSW RMY 39 03/16 50/31/41/+6/0.00/0.0/695/97           45 W   AERO 46 W   RMY 48  03/17 40/26/33/-3/0.00/0.0/590/82           40 WNW AERO M  M   RMY N/A 03/18 41/22/32/-4/0.00/0.0/694/96           29 W   AERO M  M   RMY 30 03/19 44/25/35/-1/0.00/0.0/587/81           25 W   AERO M  M   RMY N/A 03/20 50/27/39/+2/0.00/0.0/684/94           26 S   AERO M  M   RMY 29  03/21 50/33/42/+5/0.02/0.0/227/31           25 SSE AERO M  M   RMY 46 03/22 39/34/37/0/0.86/T/000/00              40 W   AERO M  M   RMY 44 03/23 45/28/37/-1/0.12/2.1/523/71           45 WNW AERO M  M   RMY 50 03/24 56/29/43/+5/0.00/0.0/437/59           28 W   AERO M  M   RMY 30 03/25 49/32/41/+3/0.00/0.0/468/63           25 NNW AERO M  M   RMY N/A 03/26 43/27/35/-4/0.00/0.0/716/96           28 NW  AERO M  M   RMY 28 03/27 42/24/33/-6/0.00/0.0/703/94           21 S   AERO M  M   RMY 23 03/28 51/28/40/+1/0.00/0.0/623/83           35 S   AERO M  M   RMY 37 03/29 53/40/47/+7/0.02/0.0/000/00           26 SSW AERO M  M   RMY 27 03/30 67/40/54/+14/0.00/0.0/477/63          44 S   AERO M  M   RMY 46 03/31 65/34/50/+9/0.10/0.0/129/17           53 S   AERO 52 S   RMY 55 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 04/01 45/29/37/-4/0.00/0.0/.../..           40 WNW AERO 37 W   RMY 42 04/02 50/27/39/-2/..../0.0/.../..           29 S   AERO 25 S   RMY 31 04/03 62/35/49/+7/..../0.0/.../..           54 W   AERO 58 W   RMY 56 04/04 50/34/42/0/..../0.0/.../..            46 W   AERO 41 W   RMY N/A 04/05 47/27/37/-6/..../0.0/.../..           23 SSW AERO 17 SSW RMY 23 04/06 64/32/48/+5/..../0.0/.../..           24 NW  AERO 18 W   RMY 26 04/07 66/41/54/+11/0.00/0.0/.../..          24 S   AERO 18 S   RMY 25 04/08 48/34/41/-3/0.49/0.0/.../..           25 NE  AERO 20 NE  RMY 26 04/09 40/32/36/-8/0.08/0.0/.../..           23 NE  AERO 16 N   RMY 25 04/10 43/30/37/-8/T/T/T/..                  32 NW  AERO 26 NW  RMY 36 04/11 51/29/40/-5/0.00/0.0/.../..           23 NW  AERO 18 NW  RMY N/A 04/12 53/38/46/+1/.../0.0/.../..            35 SSW AERO 29 SSW RMY 39 04/13 71/54/63/+17/.../0.0/.../..           38 SSW AERO 32 SSW RMY N/A 04/14 71/51/61/+15/.../0.0/.../..           25 S   AERO 18 S   RMY N/A 04/15 67/40/54/+7/.../0.0/.../..            46 W   AERO 52 W   RMY 50 04/16 Low temp since midnight is 37F; normal low is 38F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 16 HIGH 89 IN 2012 LOW 23 IN 1943 PRECIP 2.45 IN. IN 1929 SNOWFALL 2.0 IN. IN 1904, 1962 PEAK GUST 73 MPH E IN 2007 RECORDS FOR APRIL 17 HIGH 93 IN 2002 LOW 21 IN 1908 PRECIP 1.68 IN 1954 SNOWFALL 1.0 IN. IN 1899 PEAK GUST 63 MPH ESE IN 2011 TODAY'S REPORT PREPARED BY: Benjamin Turner