BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, APRIL 5, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST WITH LIGHT WINDS AND GOOD  VISIBILITY.... Today we observed an overcast layer of  cirrostratus throughout the day. Wind  was light and variable, with a shift from W-S being noticed a little before noontime.  Visibility was 80 miles at each observation,  partially due to very low humidity which fell into the upper teens by 1 P.M. Pressure has  started to trend downward by 3 millibars since  9 A.M. The high so far today is 45F, 6 degrees below  the daily normal maximum of 51F. The low since midnight is 27F, 7 degrees below the normal of 34F. 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:  5405 [-79] Total for last season: 5058 PRECIPITATION, Inches Total: 4.08 [-1.50] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: 23.1 [+10.4] Greatest in 24 hrs: N/A  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: Overcast cirrostratus Temperature: 31F; Dew Point: 10F; Wind: NW at 8 kts  Sea-level pressure: 30.51 ins. Hg, rising steadily Visibility: 80 miles 6-hr Max temp: 33F 6-hr Min temp: 27F 24-hr Precip:  0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins.  BHO SA 1155 E250 OVC 80 332/31/10/3108/051/ 8/007 53014  10033 20027  10 A.M. Weather: Overcast cirrostratus Temperature: 39F; Dew Point: 4F; Wind: NW at 4 kts, Wind: Light and variable   Sea-level pressure: 30.49 ins. Hg, falling steadily Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 E250 OVC 80 327/39/4/3204/049/ WND L/V/ 8/007 58005    1 P.M. Weather: Broken cirrostratus Temperature: 45F; Dew Point: 5F; Wind: SSW at 4 kts, Wind: Light and variable       Sea-level pressure: 30.45 ins. Hg, falling steadily  Visibility: 80 miles 6-hr Max temp: 45F 6-hr Min temp: 31F 6-hr Precip:  0.00 ins. 6-hr snowfall: 0.0 ins.  BHO SA 1755 E250 OVC 80 311/45/5/2004/045/ WND L/V/ 8/007 58016  10045 20031   SUMMARY FOR THURSDAY, APRIL 4, 2019  TEMPERATURE (DEGREES F) MAX.....50   NORMAL.....51 MIN.....34   NORMAL.....33 MEAN....42   NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL..........................0 TOTAL DEPARTURE FOR THE MONTH.........................+1 [+0.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............23   DEPARTURE..........0 TOTAL HEATING UNITS FOR THE MONTH..............93   DEPARTURE.........-1 TOTAL HEATING UNITS FOR THE SEASON...........5498   DEPARTURE........-80 TOTAL HEATING UNITS LAST SEASON TO DATE......5154   DIFFERENCE......+344 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................46 W   AT 12:40 A.M.                    AERO.........................41 W   AT 12:36 A.M.                    ASOS.........................49 W   AT 12:40 A.M.                     DAVIS........................51 WSW AT 12:37 A.M.  RMY N/A FASTEST MILE FOR YESTERDAY......................35 W   AT 12:41 A.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................31 W   AT 12:41 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................33 WSW AT 12:06 A.M. AVERAGE WIND SPEED AND DIRECTION.............19.4 W                    ASOS......................18.2                    DAVIS.....................19.4 W [261 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......-0.17                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.44  DEPARTURE.......-0.24                          ASOS..............0.44 TOTAL PRECIPITATION FOR THE YEAR..........13.48  DEPARTURE.......-1.20                          ASOS.............13.59 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.2 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE........-0.8 TOTAL SNOWFALL FOR THE SEASON..............47.6  DEPARTURE.......-12.9 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/-3/0.00/0.5/479/71           16 NNW AERO 13 NNW RMY 22 03/02 31/27/29/-2/0.48/3.7/000/00           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/..../.../.../..           29 S   AERO 25 S   RMY 31 04/03 62/35/49/+7/..../.../.../..           54 W   AERO 58 W   RMY 56 04/04 50/34/42/0/..../.../.../..            46 W   AERO 41 W   RMY N/A 04/05 Low temp since midnight is 27F; normal low is 34F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 5 HIGH 81 IN 1928 LOW 15 IN 1995 PRECIP 2.15 IN. IN 1987 SNOWFALL 4.0 IN. IN 1898 PEAK GUST 76 MPH WNW IN 1963 RECORDS FOR APRIL 6 HIGH 82 IN 1921 LOW 16 IN 1982 PRE 1.72 INS IN 1886 SNOW 12.3 INS IN 1982 WIND 71e MPH WNW IN 1940 TODAY'S REPORT PREPARED BY: Benjamin Turner