BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MARCH 25, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

DECREASING CLOUDS AND WIND WITH GREAT VISIBILITY ATOP
GREAT BLUE HILL....

We observed a perfect visibility of 90 miles this morning,
with a visibility of 85 miles at 10 A.M. and 1 P.M. Wind 
shifted from north to west throughout the day, blowing 
at an average of 10 mph. The peak gust so far today is 
25 mph shortly after 6 A.M. Conditions both at the surface
and aloft have dried out this afternoon, with a humidity of
24% being observed. Overcast skies this morning became 2/8ths
covered at the 1 P.M. observation. This allowed us to reach a
high of 48F so far today, a degree below the daily normal 
maximum. The low since midnight is 37F, 7 degrees above the
normal minimum of 30F. 


Today's Observations:

7 A.M.
Weather: Broken altocumulus, overcast cirrostratus
Temperature: 38F; Dew Point: 33F; Wind: N at 12G17 kts
Sea-level pressure: 30.03 ins. Hg, rising then more slowly  
Visibility: 90 miles
6-hr Max temp: 42F
6-hr Min temp: 37F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins. 
BHO SA 1155 E180 BKN 250 OVC 90 169/38/33/3512G17/003/ 8/076 
53019 10042 20037

10 A.M.
Weather: Scattered altocumulus, broken cirrus,
few cumulus offshore 
Temperature: 41F; Dew Point: 24F; Wind: NW at 8G16 kts  
Sea-level pressure: 30.07 ins. Hg, rising steadily 
Visibility: 85 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 E110 SCT 250 BKN 85 184/41/24/3308G16/007/ FEW CU 
OFFSHR/ 8/182 51015 

1 P.M.
Weather: Scattered altocumulus, scattered cirrus,
few cumulus E-SW 
Temperature: 47F; Dew Point: 35F; Wind: NNW at 7G14 kts   
Sea-level pressure: 30.06 ins. Hg, falling steadily  
Visibility: 85 miles
6-hr Max temp: 48F
6-hr Min temp: 37F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins. 
BHO SA 1755 120 SCT 250 SCT 85 179/47/35/3407G14/006/ FEW CU 
E-SW/ 8/182 58005 10048 20037


SUMMARY FOR SUNDAY, MARCH 24, 2019 

TEMPERATURE (DEGREES F)
MAX.....56   NORMAL.....47
MIN.....29   NORMAL.....29
MEAN....43   NORMAL.....38

DEPARTURE FROM 30-YEAR NORMAL.........................+5
TOTAL DEPARTURE FOR THE MONTH........................-27 [-1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............22   DEPARTURE.........-5
TOTAL HEATING UNITS FOR THE MONTH.............764   DEPARTURE........+28
TOTAL HEATING UNITS FOR THE SEASON...........5250   DEPARTURE........-54
TOTAL HEATING UNITS LAST SEASON TO DATE......4893   DIFFERENCE......+357

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................28 W   AT 11:58 A.M.
                   AERO.........................M
                   ASOS.........................29 W   AT 11:58 A.M. 
                   DAVIS........................29 W   AT 12:20 A.M.  RMY 30
FASTEST MILE FOR YESTERDAY......................23 SW  AT  3:59 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 SW  AT  5:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 W   AT 12:20 A.M.
AVERAGE WIND SPEED AND DIRECTION..............14.1 W
                   ASOS.......................13.6
                   DAVIS......................14.0 SW [235 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......-0.19
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.95  DEPARTURE.......-0.35
                         ASOS..............3.96
TOTAL PRECIPITATION FOR THE YEAR..........12.91  DEPARTURE.......+0.19
                         ASOS.............13.03

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.3
TOTAL SNOWFALL FOR THE MONTH...............23.1  DEPARTURE.......+12.4
TOTAL SNOWFALL FOR THE SEASON..............47.6  DEPARTURE.......-10.1


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/..../.../.../..           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/..../.../.../..           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/..../.../.../..           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/..../.../.../..           33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/.../..          28 WNW AERO 12 SW  RMY N/A
03/06 24/10/17/-15/0.00/0.0/.../..          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/.../..           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/.../..          23 WSW AERO M  M   RMY M 
03/09 43/22/33/0/0.00/0.0/.../..            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/..../.../.../..            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/..../.../.../..           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/..../.../.../..            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/..../.../.../..            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/..../.../.../..            25 S   AERO 28 S   RMY M
03/15 58/40/49/+14/0.12/0.0/.../..          37 SSW AERO 38 SSW RMY 39
03/16 50/31/41/+6/0.00/0.0/.../..           45 W   AERO 46 W   RMY 48
03/17 40/26/33/-3/0.00/0.0/.../..           40 WNW AERO M  M   RMY N/A
03/18 41/22/32/-4/0.00/0.0/.../..           29 W   AERO M  M   RMY 30
03/19 44/25/35/-1/0.00/0.0/.../..           25 W   AERO M  M   RMY N/A
03/20 50/27/39/+2/0.00/0.0/.../..           26 S   AERO M  M   RMY 29
03/21 50/33/42/+5/..../.../.../..           25 SSE AERO M  M   RMY 46
03/22 39/34/37/0/..../.../.../..            40 W   AERO M  M   RMY 44
03/23 45/28/37/-1/0.00/0.0/.../..           45 WNW AERO M  M   RMY 50
03/24 56/29/43/+5/0.00/0.0/.../..           28 W   AERO M  M   RMY 30

03/25 Low temp since midnight is 28F; normal low is 29F


DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR MARCH 25
HIGH 76 IN 1910
LOW 8 IN 1888, 1956
PRECIP 1.84 INS. IN 1909
SNOWFALL 1.0 INS. IN 1912
PEAK GUST 69 MPH SE IN 1969

RECORDS FOR MARCH 26
HIGH 76 IN 1922, 1949
LOW 6 IN 1960
PRECIP 1.99 INS. IN 1988
SNOWFALL 5.4 INS. IN 2001
PEAK GUST 63 MPH S IN 1970

TODAY'S REPORT PREPARED BY: Benjamin Turner