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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 12, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY SKIES WITH DECREASING VISIBILITY AND 
INTENSIFYING WIND MOVING INTO THE AFTERNOON....

Clouds moved in last night, and continued to cover 
the sky throughout the day. Visibility has been 
gradually decreasing throughout the day, with 
60 miles observed at 7 A.M and 40 miles observed 
before  1 P.M. Wind has slowly started to increase 
since yesterday afternoon. The max gust so far today 
is 24 mph. The high so far today is 49F, 5 degrees 
below the normal of 54F. The low since midnight is 
38F, 2 degrees above the daily normal minimum of 36F. 


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:  5404 [-80]
Total for last season: 5058

PRECIPITATION, Inches
Total: 4.08 [-1.50]
Greatest in 24 hrs: 1.82 ins. on the 3rd-4th

SNOWFALL, Inches
Total: 23.1 [+10.4]
Greatest in 24 hrs: 15.8 ins. on the 3rd-4th 

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 stratocumulus
Temperature: 41F; Dew Point: 34F; Wind: S at 9 kts 
Sea-level pressure: 30.34 ins. Hg, steady, then increasing
Visibility: 60 miles 
6-hr Max temp: 41F
6-hr Min temp: 38F
24-hr Precip: 0.0
24-hr snowfall: 0.0
Snow depth: 0 ins. 
BHO SA 1155 E40 OVC 60 275/41/34/1909/034/ 8/5// 53010 10041 20038

10 A.M.
Weather: Overcast stratocumulus
Temperature: 44F; Dew Point: 33F; Wind: NW at 8 kts  
Sea-level pressure: 30.37 ins. Hg, increasing, then decreasing
Visibility: 50 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 OVC 50 285/44/33/1608/037/ HZ ALQDS K PLUME NW/ 
8/5// 50002   

1 P.M.
Weather: Overcast stratocumulus
Temperature: 49F; Dew Point: 34F; Wind: WNW at 11G19 kts,
Sea-level pressure: 30.38 ins. Hg, steady, then increasing
Visibility: 40 miles
6-hr Max temp: 49F
6-hr Min temp: 41F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins. 
BHO SA 1755 E27 OVC 40 287/49/34/1811G19/038/ HZ ALQDS/ 8/5// 
58016 10049 20041

SUMMARY FOR THURSDAY, APRIL 11, 2019 

TEMPERATURE (DEGREES F)
MAX.....51   NORMAL.....54
MIN.....29   NORMAL.....36
MEAN....40   NORMAL.....45

DEPARTURE FROM 30-YEAR NORMAL........................-5
TOTAL DEPARTURE FOR THE MONTH.......................-13 [-1.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............25   DEPARTURE.........+5
TOTAL HEATING UNITS FOR THE MONTH.............252   DEPARTURE........+13
TOTAL HEATING UNITS FOR THE SEASON...........5657   DEPARTURE........-66
TOTAL HEATING UNITS LAST SEASON TO DATE......5359   DIFFERENCE......+301

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23 NW  AT 10:37 A.M.
                   AERO.........................18 NW  AT 10:37 A.M.
                   ASOS.........................25 NW  AT 10:38 A.M. 
                   DAVIS........................26 WNW AT 10:37 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY......................17 NW  AT 10:36 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 NNW AT 10:38 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 WNW AT 10:37 A.M.
AVERAGE WIND SPEED AND DIRECTION...............9.0 NW
                   ASOS........................8.9 
                   DAVIS.......................9.3 W [270 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..........1.23  DEPARTURE.......-0.64
                         ASOS..............1.18
TOTAL PRECIPITATION FOR THE YEAR..........14.27  DEPARTURE.......-1.60
                         ASOS.............14.33

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0  DEPARTURE........-0.2
TOTAL SNOWFALL FOR THE MONTH.............Trace  DEPARTURE........-1.8
TOTAL SNOWFALL FOR THE SEASON.............47.6  DEPARTURE.......-13.9


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/..../0.0/.../..           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/..../0.0/.../..           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/..../0.0/.../..            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/..../0.0/.../..           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/..../0.0/.../..           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/.../..          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/.../..                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 Low temp since midnight is 29F; normal low is 36F


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

RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 12.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978

RECORDS FOR APRIL 13
HIGH 85 IN 1945
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 59 MPH SSW IN 1995

TODAY'S REPORT PREPARED BY: Nicholas Rousseau