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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MARCH 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MUCH MORE SEASONABLE WITH CLEAR SKIES 
AND LIGHT WINDS ATOP GREAT BLUE HILL....

We observed an average visibility of 35 miles
throughout the day due to a smoke layer along the
horizon. Sky conditions were completely clear 
throughout the observation period. Wind was below 
10 mph since this morning, shifting from southwest 
to northwest by 1 P.M. Temperatures today are very 
close to normal, with a high of 42F and a low of 
22F so far today. The high temperature so far today 
is the daily normal maximum. The low since midnight 
is 2 degrees below the normal minimum of 24F.  


PRELIMINARY STATS FOR FEBRUARY 2019

TEMPERATURE, Deg. F
Avg. Max. 37.3 [+0.5]
Avg. Min. 21.6 [+2.5]
Mean      29.5 [+1.6]
24-hour corrected mean: 29.2
Max. for month: 62F on the 5th
Min. for month: 5F  on the 1st

HEATING DEGREE DAYS
Total heating units:    990 [-47]
Total for the season:  4486 [-82]
Total for last season: 4122

PRECIPITATION, Inches
Total: 3.61 [-0.46]
Greatest in 24 hrs: 1.14 ins. on the 12th-13th

SNOWFALL, Inches
Total: 12.1 [-1.8]
Greatest in 24 hrs: 4.7 ins. on the 17th-18th 

WIND, mph
Avg. uncorrected wind speed: 12.9
Avg. corrected wind speed: 13.3
Prevailing wind direction: WNW at 22%
Peak gust and direction: 66 W on 25th  

SUNSHINE:
Campbell-Stokes card minutes: 9132 minutes of possible 17148 or 53%
Astronomical total minutes:   9476 minutes of possible 17766 or 53%

Today's Observations:

7 A.M.
Weather: Clear
Temperature: 25F; Dew Point: 15F; Wind: W at 13G16 kts
Sea-level pressure: 30.24 ins. Hg, rising steadily
Visibility: 30 miles, distant smoke layer
6-hr Max temp: 25F
6-hr Min temp: 22F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 10 ins. 
BHO SA 1155 CLR 30 242/25/15/2713G16/024/ K LYR 
ALG HRZN/ 4/010 53019 10025 20022  

10 A.M.
Weather: Clear
Temperature: 36F; Dew Point: 14F; Wind: SW at 7G12 kts  
Sea-level pressure: 30.29 ins. Hg, rising steadily 
Visibility: 30 miles, distant smoke layer
3-hr Precip: 0.00 ins. 
BHO SA 1455 CLR 30 259/36/14/2307G12/029/ K LYR 
ALG HRZN/ 51017 

1 P.M.
Weather: Clear  
Temperature: 40F; Dew Point: 11F; Wind: NW at 6 kts,
Wind: Light  
Sea-level pressure: 30.28 ins. Hg, falling steadily
Visibility: 45 miles, distant smoke layer
6-hr Max temp: 42F
6-hr Min temp: 25F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 9 ins. 
BHO SA 1755 CLR 45 257/40/11/3106/028/ K LYR ALG HRZN 
WND LGT/ 4/009 58002 10042 20025

SUMMARY FOR FRIDAY, MARCH 8, 2019 

TEMPERATURE (DEGREES F)
MAX.....35   NORMAL.....42
MIN.....11   NORMAL.....24
MEAN....23   NORMAL.....33

DEPARTURE FROM 30-YEAR NORMAL........................-10
TOTAL DEPARTURE FOR THE MONTH........................-63 [-8.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............42   DEPARTURE........+10
TOTAL HEATING UNITS FOR THE MONTH.............327   DEPARTURE........+63
TOTAL HEATING UNITS FOR THE SEASON...........4813   DEPARTURE........-19
TOTAL HEATING UNITS LAST SEASON TO DATE......4353   DIFFERENCE......+460

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23 WSW AT  1:34 P.M.
                   AERO..........................M
                   ASOS.........................23 SW  AT 11:05 A.M. 
                   DAVIS........................24 SW  AT  1:27 P.M. RMY M
FASTEST MILE FOR YESTERDAY......................18 WSW AT  8:19 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 SW  AT  8:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 SW  AT  9:08 P.M.
AVERAGE WIND SPEED AND DIRECTION..............12.1 SW
                   ASOS.......................12.3
                   DAVIS......................11.8 SW [221 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......-0.18
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.32  DEPARTURE.......+0.93
                         ASOS..............2.35
TOTAL PRECIPITATION FOR THE YEAR..........11.26  DEPARTURE.......+1.45
                         ASOS.............11.40

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH...............20.0  DEPARTURE.......+15.9
TOTAL SNOWFALL FOR THE SEASON..............44.5  DEPARTURE........-6.6


PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01 19/5/12/-14/0.00/0.0/552/95          29 W   AERO 28 W   RMY N/A
02/02 30/7/19/-7/0.00/0.0/318/55           32 WSW AERO 32 WSW RMY 31
02/03 38/27/33/+7/0.00/0.0/126/22          26 S   AERO 25 S   RMY N/A
02/04 59/33/46/+20/0.00/0.0/540/93         25 SSW AERO 28 SSW RMY N/A
02/05 62/39/51/+25/0.00/0.0/354/60         30 WNW AERO 29 WNW RMY 32
02/06 39/28/34/+8/0.35/T/396/67            24 NNW AERO 23 NNW RMY N/A
02/07 37/31/34/+7/0.35/0.0/000/00          28 ENE AERO 24 ENE RMY 28
02/08 51/27/39/+12/0.07/0.0/204/34         46 W   AERO 46 WNW RMY 51
02/09 32/20/26/-1/0.00/0.0/594/100         50 WNW AERO 52 WNW RMY 52
02/10 33/18/26/-1/0.00/0.0/510/85          24 WNW AERO 23 WNW RMY 25
02/11 34/21/28/+1/0.00/0.0/318/53          24 NNW AERO 23 NNW RMY 25
02/12 33/13/23/-4/0.90/2.8/000/00          32 E   AERO 30 E   RMY 26
02/13 39/29/34/+6/0.26/0.1/018/03          36 W   AERO 32 W   RMY 36
02/14 37/26/32/+4/0.00/0.0/594/97          44 WNW AERO 42 WNW RMY 45
02/15 49/29/39/+11/0.11/0.0/060/10         40 S   AERO 40 S   RMY 44
02/16 44/26/35/+7/0.00/0.0/504/82          25 NW  AERO 25 NW  RMY N/A
02/17 37/19/28/0/0.01/T/618/100            30 NNW AERO 25 NNW RMY N/A
02/18 30/16/23/-6/0.41/4.7/000/00          35 NW  AERO 36 NW  RMY 41
02/19 30/10/20/-9/0.00/0.0/618/99          35 NW  AERO 33 NW  RMY N/A
02/20 26/12/19/-10/0.12/0.3/000/00         16 WNW AERO 14 SSW RMY N/A
02/21 43/21/32/+3/0.33/0.7/294/47          36 W   AERO 33 W   RMY 38
02/22 43/30/37/+8/0.00/0.0/504/80          22 NW  AERO 21 NW  RMY 23
02/23 38/24/31/+1/0.00/0.0/336/53          18 NNW AERO 16 NNW RMY N/A
02/24 45/30/38/+8/0.40/0.0/000/00          41 W   AERO 37 W   RMY 47
02/25 37/25/31/+1/0.03/T/336/57            66 W   AERO 59 W   RMY M 
02/26 29/14/22/-8/0.00/0.0/642/100         46 WNW AERO 39 WNW RMY 47
02/27 22/9/16/-15/0.10/1.2/180/28          35 WNW AERO 26 WNW RMY N/A
02/28 28/15/22/-9/0.17/2.3/486/75          22 NW  AERO 18 NW  RMY 22

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/..../.../.../..           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/..../.../.../..           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/..../.../.../..           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/..../.../.../..           33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/.../..          28 WNW AERO 12 SW  RMY N/A
03/06 24/10/17/-15/0.00/0.0/.../..          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/.../..           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/.../..          23 WSW AERO M  M   RMY M 

03/09 Low temp since midnight is 22F; normal low is 24F

****Aerovane speed not working, R.M. Young not reset

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

RECORDS FOR MARCH 9
HIGH 75 IN 2016
LOW 1 IN 2007
PRECIP 2.67 INS. IN 1998
SNOWFALL 6.3 INS. IN 2013
PEAK GUST 102e MPH S IN 1942 [RECORD FOR MONTH]

RECORDS FOR MARCH 10
HIGH 69 IN 1977
LOW 2 IN 1984
PRECIP 2.00 INS. IN 1994
SNOWFALL 4.0 INS. IN 1997
PEAK GUST 80 MPH NW IN 1974

TODAY'S REPORT PREPARED BY: Benjamin Turner