BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
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DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 18, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST AND CLOUDY WITH WIND PICKING UP 
IN THE AFTERNOON....

We observed an excellent visibility this morning
of 85 miles, decreasing to 75 miles by the 1 P.M.
observation. Wind increased since this morning,
with an average speed of 22 mph and a max gust of
37 mph so far today. Sporadic and light rain showers
came through, leaving only a trace. The high temperature 
so far today is 50F, 7 degrees below our normal maximum 
temperature of 57F. The low since midnight is 39F, 1 
degree above our normal minimum temperature of 38F. 


Today's Observations:

7 A.M.
Weather: Overcast altostratus, distant virga 
Temperature: 42F; Dew Point: 31F; Wind: S at 9G16 kts
Sea-level pressure: 30.27 ins. Hg, falling steadily
Visibility: 85 miles
6-hr Max temp: 42F
6-hr Min temp: 39F
24-hr Precip:  Trace
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins. 
BHO SA 1155 E65 OVC 85 252/42/31/1709G16/027/ DSNT 
VIRGA ALQDS/ 8/02/ 51006 10042 20039 

10 A.M.
Weather: Overcast altostratus
Temperature: 44F; Dew Point: 32F; Wind: S at 17G30 kts,
Peak wind: 35 MPH (30 kts) S at 9:57 A.M. 
Sea-level pressure: 30.22 ins. Hg, falling steadily
Visibility: 85 miles
3-hr Precip: Trace
BHO SA 1455 E65 OVC 85 235/44/32/1717G30/022/ PK WND 
1730/57/ 8/02/ 600// 58017  

1 P.M.
Weather: Overcast altostratus, few stratus fractus 
in all directions
Temperature: 49F; Dew Point: 38F; Wind: SSE at 21G30 kts,
Peak wind: 35 MPH (30 kts) SSE at 12:40 P.M. 
Sea-level pressure: 30.19 ins. Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 50F
6-hr Min temp: 42F
6-hr Precip:  Trace
6-hr snowfall: 0.0 ins. 
BHO SA 1755 E65 OVC 75 223/49/38/1621G30/019/ FEW STFA 
ALQDS PK WND 1630/40/ 8/72/ 600// 58012 10050 20042

SUMMARY FOR WEDNESDAY, APRIL 17, 2019 

TEMPERATURE (DEGREES F)
MAX.....62   NORMAL.....56
MIN.....36   NORMAL.....38
MEAN....49   NORMAL.....47

DEPARTURE FROM 30-YEAR NORMAL........................+2
TOTAL DEPARTURE FOR THE MONTH.......................+31 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............16   DEPARTURE.........-2
TOTAL HEATING UNITS FOR THE MONTH.............324   DEPARTURE........-30
TOTAL HEATING UNITS FOR THE SEASON...........5729   DEPARTURE.......-109
TOTAL HEATING UNITS LAST SEASON TO DATE......5483   DIFFERENCE......+246

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................26 ESE AT  5:43 P.M.
                   AERO.........................25 S   AT  8:34 P.M.
                   ASOS.........................27 SSE AT  5:45 P.M. 
                   DAVIS........................28 S   AT  8:56 P.M.  RMY 28
FASTEST MILE FOR YESTERDAY......................20 S   AT  8:34 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 S   AT  8:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 S   AT  9:58 P.M.
AVERAGE WIND SPEED AND DIRECTION.............10.6 NW
                   ASOS......................10.8 
                   DAVIS.....................11.1 SW [233 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE.......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.84  DEPARTURE.......+0.04
                         ASOS..............2.74
TOTAL PRECIPITATION FOR THE YEAR..........15.88  DEPARTURE.......-0.78
                         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........-2.4
TOTAL SNOWFALL FOR THE SEASON.............47.6  DEPARTURE.......-14.5


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/-4/0.00/0.0/726/98           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/..../0.0/582/79           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/..../0.0/468/63           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/..../0.0/690/93            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/..../0.0/324/44           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/..../0.0/516/69           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/306/41          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 58/37/48/+1/0.00/0.0/.../..           46 W   AERO 44 W   RMY 44 
04/17 62/36/49/+2/0.00/0.0/.../..           26 ESE AERO 25 S   RMY 28

04/18 Low temp since midnight is 39F; normal low is 39F


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

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 3.7 IN. IN 1965
PEAK GUST 59 MPH S IN 1982

RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH]
LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 6.0 IN. IN 1887
PEAK GUST 66 MPH E IN 1984

TODAY'S REPORT PREPARED BY: Benjamin Turner