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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MARCH 18, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER AND WESTERLY WINDS PERSIST
ATOP GREAT BLUE HILL....

We observed an excellent visibility of 85 miles 
throughout the day with some cumulus clouds at each 
observation. Wind from the west increased since this 
morning, with a peak gust of 30 mph since 7 A.M. 
Conditions remained dry, with the lowest humidity 
observed being 28% at 1 P.M. Due to some cold air 
advection with the westerly winds, temperatures have 
once again stayed below seasonal averages. The high 
so far today is 39F, 6 degrees below the daily normal 
maximum of 45F. The low since midnight is 22F, 5 degrees 
under the normal minimum temperature of 27F.         


Today's Observations:

7 A.M.
Weather: Clear, few distant cumulus in all directions
Temperature: 25F; Dew Point: 13F; Wind: W at 9G12 kts
Sea-level pressure: 30.22 ins. Hg, rising steadily  
Visibility: 85 miles
6-hr Max temp: 25F
6-hr Min temp: 22F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins. 
BHO SA 1155 CLR 85 234/25/13/2809G12/022/ FEW DSNT 
CU ALQDS/ 8/100 53008 10025 20022 

10 A.M.
Weather: Scattered cumulus
Temperature: 34F; Dew Point: 14F; Wind: W at 9G14 kts     
Sea-level pressure: 30.24 ins. Hg, rising steadily  
Visibility: 85 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 50 SCT 85 241/34/14/2809G14/024/ 8/100 51007

1 P.M.
Weather: Scattered cumulus 
Temperature: 39F; Dew Point: 9F; Wind: W at 12G20 kts    
Sea-level pressure: 30.21 ins. Hg, falling steadily  
Visibility: 85 miles 
6-hr Max temp: 39F
6-hr Min temp: 25F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins. 
BHO SA 1755 50 SCT 85 233/39/9/2812G20/021/ 8/100 58008 
10039 20025


SUMMARY FOR SUNDAY, MARCH 17, 2019 

TEMPERATURE (DEGREES F)
MAX.....40   NORMAL.....44
MIN.....26   NORMAL.....27
MEAN....33   NORMAL.....36

DEPARTURE FROM 30-YEAR NORMAL.........................-3
TOTAL DEPARTURE FOR THE MONTH........................-34 [-2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............32   DEPARTURE.........+3
TOTAL HEATING UNITS FOR THE MONTH.............574   DEPARTURE........+34
TOTAL HEATING UNITS FOR THE SEASON...........5060   DEPARTURE........-48
TOTAL HEATING UNITS LAST SEASON TO DATE......4655   DIFFERENCE......+405

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................40 WNW AT 1:24 A.M.
                   AERO.........................M
                   ASOS.........................40 WNW AT 1:37 A.M. 
                   DAVIS........................42 WSW AT 1:25 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY......................32 WNW AT 1:32 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................30 W   AT 1:32 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................31 WSW AT 1:32 A.M.
AVERAGE WIND SPEED AND DIRECTION..............14.6 W
                   ASOS.......................13.6
                   DAVIS......................14.8 W  [260 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..........2.97  DEPARTURE.......+0.02
                         ASOS..............2.97
TOTAL PRECIPITATION FOR THE YEAR..........11.91  DEPARTURE.......+0.54
                         ASOS.............12.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.4
TOTAL SNOWFALL FOR THE MONTH...............21.0  DEPARTURE.......+12.9
TOTAL SNOWFALL FOR THE SEASON..............45.5  DEPARTURE........-9.6


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

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 43/22/33/0/0.00/0.0/.../..            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/..../.../.../..            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/..../.../.../..           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/..../.../.../..            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/..../.../.../..            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/..../.../.../..            25 S   AERO 28 S   RMY M
03/15 58/40/49/+14/0.12/.../.../..          37 SSW AERO 38 SSW RMY 39
03/16 50/31/41/+6/..../.../.../..           45 W   AERO 46 W   RMY 48
03/17 40/26/36/-3/..../.../.../..           40 WNW AERO M  M   RMY N/A

03/18 Low temp since midnight is 22F; normal low is 27F


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

RECORDS FOR MARCH 18
HIGH 72 IN 2012
LOW 0 IN 1885
PRECIP 5.61 INS. IN 1968 [RECORD FOR MONTH]
SNOWFALL 9.3 INS. IN 1985
PEAK GUST 71e MPH WNW IN 1941

RECORDS FOR MARCH 19
HIGH 77 IN 2012
LOW -2 IN 1967
PRECIP 1.69 INS. IN 1956
SNOWFALL 17.6 INS. IN 1956 [RECORD FOR MONTH]
PEAK GUST 75e MPH WNW IN 1941

TODAY'S REPORT PREPARED BY: Benjamin Turner