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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 19, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY DAY WITH INCREASING WIND AND WARM TEMPERATURES….

At the 7 A.M observation the temperature was 63 degrees 
with a relative humidity of 79%. This is particularly warm 
and humid for an April morning on top of Blue Hill. Gusty 
conditions continued throughout the day. The max gust so far 
being 45 Miles per hour observed shortly after 11 A.M along 
with a passing shower. The high temperature so far today is 70F, 
13 degrees above our normal maximum temperature of 57F. The low 
since midnight is 58F, 18 degree above our normal minimum 
temperature of 39F.

Today's Observations:

7 A.M.
Weather: Broken Stratocumulus 
Temperature: 63F; Dew Point: 56F; Wind: SSW at 18G31 kts
Peak wind: 36 MPH (31 kts) SSW at 6:46 A.M.
Sea-level pressure: 29.86 ins. Hg, rising steadily
Visibility: 40 miles
6-hr Max temp: 63F
6-hr Min temp: 46F
24-hr Precip:  Trace
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins. 
BHO SA 1155 E30 BKN 40 114/63/56/2018G31/986/ DNST HZ 
ALQDS PK WND 2031/46/ 8/400 53005 10063 10046

10 A.M.
Weather: Broken Cumulus and Stratocumulus 
Temperature: 69F; Dew Point: 58F; Wind: SSW at 22G30 kts,
Peak wind: 42 MPH (36 kts) S at 9:08 A.M. 
Sea-level pressure: 29.85 ins. Hg, falling then, rising
Visibility: 30 miles
3-hr Precip: 0.0
BHO SA 1455 E42 BKN 30 109/69/58/21222G30/985/ DNST HZ 
ALQDS PK WND 2136/08/ 8/800 55005

1 P.M.
Weather: Scattered Cumulus, Overcast Stratocumulus
Temperature: 70F; Dew Point: 57F; Wind: SSE at 24G33 kts,
Peak wind: 43 MPH (37 kts) SSW at 12:05 P.M. 
Sea-level pressure: 29.82 ins. Hg, falling then, falling more rapidly
Visibility: 30 miles
6-hr Max temp: 70F
6-hr Min temp: 62F
6-hr Precip:  Trace
6-hr snowfall: 0.0 ins. 
BHO SA 1755 E42 OVC 30 101/70/57/2024G33/982/ DNST HZ 
ALQDS PK WND 2037/05/ 8/8// 58008 10070 20062

SUMMARY FOR THURSDAY, APRIL 18, 2019 

TEMPERATURE (DEGREES F)
MAX.....63   NORMAL.....57
MIN.....39   NORMAL.....39
MEAN....51   NORMAL.....48

DEPARTURE FROM 30-YEAR NORMAL........................+3
TOTAL DEPARTURE FOR THE MONTH.......................+34 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............14   DEPARTURE.........-3
TOTAL HEATING UNITS FOR THE MONTH.............338   DEPARTURE........-34
TOTAL HEATING UNITS FOR THE SEASON...........5743   DEPARTURE.......-112
TOTAL HEATING UNITS LAST SEASON TO DATE......5505   DIFFERENCE......+238

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................44 S   AT  10:05 P.M.
                   AERO.........................44 S   AT  10:04 P.M.
                   ASOS.........................46 SSW AT  10:07 P.M. 
                   DAVIS........................56 S   AT  10:06 P.M.  RMY 50
FASTEST MILE FOR YESTERDAY......................33 S   AT  10:00 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................33 S   AT  10:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................37 S   AT  10:00 P.M.
AVERAGE WIND SPEED AND DIRECTION.............17.5 SSE
                   ASOS......................17.4 
                   DAVIS.....................17.2 SSE [162 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE.......-0.14
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........2.84  DEPARTURE.......-0.10
                         ASOS..............2.75
TOTAL PRECIPITATION FOR THE YEAR..........15.88  DEPARTURE.......-1.06
                         ASOS.............15.90

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........-2.5
TOTAL SNOWFALL FOR THE SEASON.............47.6  DEPARTURE.......-14.6


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 63/39/51/+3/0.00/0.0/.../..     44 S   AERO 44 S   RMY 50

04/19 Low temp since midnight is 58F; normal low is 39F


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

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

RECORDS FOR APRIL 20
HIGH 88 IN 1927
LOW 18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963

TODAY'S REPORT PREPARED BY: Nicholas Rousseau