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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 11, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH WINDS BECOMING LIGHT 
THROUGHOUT THE DAY....

We observed an average visibility of 85 miles at each
observation. Skies were cloudless this morning, but 
some cirrus moved in by the 10 A.M. observation. Wind
has decreased since this morning, with an average speed
of 6 mph by 1 P.M. The high so far today is 49F, 5 degrees 
below the normal of 54F. The low since midnight is 29F, 7 
degrees below 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:  5405 [-79]
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: Clear, few distant altostratus E-NW
Temperature: 34F; Dew Point: 19F; Wind: NW at 8G14 kts 
Sea-level pressure: 30.19 ins. Hg, rising rapidly
Visibility: 80 miles 
6-hr Max temp: 34F
6-hr Min temp: 29F
24-hr Precip:   Trace
24-hr snowfall: Trace
Snow depth: 0 ins. 
BHO SA 1155 CLR 80 223/34/19/3308G14/019/ FEW DSNT 
AS E-NW/ 8/020 53031 10034 20029 

10 A.M.
Weather: Scattered cirrus, few altostratus S-WSW
Temperature: 43F; Dew Point: 16F; Wind: NW at 8G16 kts  
Sea-level pressure: 30.24 ins. Hg, rising steadily
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 85 239/43/16/3208G16/024/ FEW DSNT 
AS S-WSW/ 8/022 51016   

1 P.M.
Weather: Scattered cirrus
Temperature: 46F; Dew Point: 16F; Wind: WNW at 6 kts,
Wind: Light 
Sea-level pressure: 30.22 ins. Hg, falling steadily
Visibility: 85 miles
6-hr Max temp: 49F
6-hr Min temp: 34F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins. 
BHO SA 1755 250 SCT 85 234/46/16/3006/022/ WND LGT/ 
8/002 56005 10049 20034 

SUMMARY FOR WEDNESDAY, APRIL 10, 2019 

TEMPERATURE (DEGREES F)
MAX.....43   NORMAL.....53
MIN.....30   NORMAL.....36
MEAN....37   NORMAL.....45

DEPARTURE FROM 30-YEAR NORMAL........................-8
TOTAL DEPARTURE FOR THE MONTH........................-8 [-1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............28   DEPARTURE.........+8
TOTAL HEATING UNITS FOR THE MONTH.............230   DEPARTURE..........8
TOTAL HEATING UNITS FOR THE SEASON...........5635   DEPARTURE........-71
TOTAL HEATING UNITS LAST SEASON TO DATE......5333   DIFFERENCE......+302

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................32 NW  AT 10:37 A.M.
                   AERO.........................26 NW  AT 10:37 A.M.
                   ASOS.........................37 NW  AT 10:38 A.M. 
                   DAVIS........................36 W   AT 10:37 A.M.  RMY 36
FASTEST MILE FOR YESTERDAY......................26 NW  AT 10:36 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................24 NW  AT 10:38 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................27 W   AT 10:37 A.M.
AVERAGE WIND SPEED AND DIRECTION...............13.3 NW
                   ASOS........................13.3 
                   DAVIS.......................13.2 WNW [283 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE.......-0.18
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.23  DEPARTURE.......-0.47
                         ASOS..............1.18
TOTAL PRECIPITATION FOR THE YEAR..........14.27  DEPARTURE.......-1.43
                         ASOS.............14.33

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........Trace  DEPARTURE........-0.1
TOTAL SNOWFALL FOR THE MONTH..............Trace  DEPARTURE........-1.6
TOTAL SNOWFALL FOR THE SEASON..............47.6  DEPARTURE.......-13.7


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 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 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963

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

TODAY'S REPORT PREPARED BY: Benjamin Turner