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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 23, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY AND RAINY THIS MORNING WITH CONDITIONS
IMPROVING IN THE AFTERNOON....

Fog limited visibility to a 1/2 mile at 7 A.M., but 
dissipated throughout the day. The visibility at 1 P.M.
was 75 miles. Heavy precipitation overnight left a 
total of 2.97 inches in the gauge, with an estimated
amount of 2.57 falling yesterday. This will easily 
replace the daily rainfall record for yesterday of
1.85 inches in the year 2000. Winds have become 
gradually lighter since this morning, with an average
speed of 6 mph by noontime. The high so far today is 51F, 
8 degrees below the daily normal of 59F. The low since 
midnight is 44F, 3 degrees above the normal minimum of 41F.   


Today's Observations:

7 A.M.
Weather: Light rain
Temperature: 46F; Dew Point: 46F; Wind: NE at 9G19 kts
Sea-level pressure: 29.96 ins. Hg, rising steadily
Visibility: 1/2 mile, fog
6-hr Max temp: 47F
6-hr Min temp: 44F
24-hr Precip: 2.97 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins. 
BHO SA 1155 W3 X 1/2R-F 144/46/46/0409G19/996/ R-CTD/ 
8//// 70297 51017 10047 20044

10 A.M.
Weather: Light drizzle, partial obscuration due to fog
Temperature: 48F; Dew Point: 48F; Wind: NNW at 8 kts 
Sea-level pressure: 29.98 ins. Hg, rising steadily
Visibility: 1 mile, except 3 miles to the southeast
3-hr Precip: 0.01 ins.
BHO SA 1455 –X 1L-F 151/48/48/3408/998/ L-CTD VSBY 3 SE/
8//// 6001/ 53007 

1 P.M.
Weather: Overcast stratus
Temperature: 50F; Dew Point: 48F; Wind: E at 6 kts,
Wind: Light
Sea-level pressure: 29.94 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 51F
6-hr Min temp: 45F
6-hr Precip: 0.01 ins.
6-hr snowfall: 0.0 ins. 
BHO SA 1755 E20 OVC 70 139/50/48/0806/994/ WND LGT/ 8/6// 
6001/ 56012 10051 20045

SUMMARY FOR MONDAY, APRIL 22, 2019 

TEMPERATURE (DEGREES F)
MAX.....53   NORMAL.....58
MIN.....45   NORMAL.....40
MEAN....49   NORMAL.....49

DEPARTURE FROM 30-YEAR NORMAL.........................0
TOTAL DEPARTURE FOR THE MONTH.......................+77 [+3.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............16   DEPARTURE..........0
TOTAL HEATING UNITS FOR THE MONTH.............365   DEPARTURE........-88
TOTAL HEATING UNITS FOR THE SEASON...........5770   DEPARTURE.......-166
TOTAL HEATING UNITS LAST SEASON TO DATE......5603   DIFFERENCE......+167

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................35 NNE AT  5:33 P.M.
                   AERO.........................32 NNE AT  4:13 P.M.
                   ASOS.........................34 NNE AT  8:15 P.M. 
                   DAVIS........................35 NE  AT  5:33 P.M.  RMY 35
FASTEST MILE FOR YESTERDAY......................23 NNE AT  8:20 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................23 NNE AT  8:20 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................23 NE  AT  8:28 P.M.
AVERAGE WIND SPEED AND DIRECTION..............12.0 NNE
                   ASOS.......................12.3
                   DAVIS......................12.1 NNE [33 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....2.97  DEPARTURE.......+2.83
                         ASOS..............3.00
TOTAL PRECIPITATION FOR THE MONTH..........6.36  DEPARTURE.......+2.88
                         ASOS..............6.24
TOTAL PRECIPITATION FOR THE YEAR..........19.40  DEPARTURE.......+1.92
                         ASOS.............19.39

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........-2.8
TOTAL SNOWFALL FOR THE SEASON.............47.6  DEPARTURE.......-14.9


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

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 71/58/65/+17/.../0.0/.../..           47 SSW AERO 51 SSW RMY 52
04/20 68/60/64/+15/.../0.0/.../..           50 SSW AERO 54 SSW RMY 52
04/21 68/51/60/+11/.../0.0/.../..           35 S   AERO 35 S   RMY N/A
04/22 53/45/49/0/.../0.0/.../..             35 NNE AERO 32 NNE RMY 35

04/23 Low temp since midnight is 44F; normal low is 41F


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

RECORDS FOR APRIL 23
HIGH 85 IN 1908, 2007 
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 2.0 IN. IN 2012
PEAK GUST 64 MPH WNW IN 1962

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY'S REPORT PREPARED BY: Benjamin Turner