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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MARCH 19, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD START TO A SUNNY CLEAR DAY WITH 
PERFECT VISIBILITY...  

Today continued to be below seasonable with a
low of 13 since midnight. This is 14 degrees
below the normal of 27F. Yesterday we reached
31F, which is also 14 degrees below the normal
of 45F. So far today we have reached a max of 
32F. Although temperatures are below seasonable
we had clear cloudless skies today with perfect
visibility of 90 miles at 10:00 A.M. and 1:00 
P.M. Wind continues to be moderate and from the 
NW. So far today we have had a peak gust of 
28 kts (32 MPH), with frequent gust over 24 kts
(28 MPH).

Today's Observations:

7 A.M.
Weather: Sky clear, few altocumulus E-SSW
Temperature: 17F; Dew Point: 0F; Wind: NW at 10G16 kts
Sea-level pressure: 29.92 ins. Hg, rising, then more slowly           
Visibility: 80 miles
6-hr Max temp: 19F
6-hr Min temp: 13F
24-hr precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 11 ins.
BHO SA 1155 CLR 80 133/17/00/3110G16/992/ FEW AC E-SSW/ 
8/060 4/011 51007 10019 20013 

10 A.M.
Weather: Sky clear
Temperature: 25F; Dew Point: 3F; Wind: NW at 7G19 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more rapidly 
Visibility: 90 miles
3-hr precip:  0.00 ins.
3-hr snowfall: 0.0 ins.    
BHO SA 1455 SKC 90 130/25/03/3107G19/991/ 58003

1 P.M.
Weather: Sky clear
Temperature: 32F; Dew Point: 8F; Wind: NW at 17G27 kts,
Peak wind: 28 kts (32 MPH) NW at 12:23 P.M.
Sea-level pressure: 29.85 ins. Hg, falling, then more rapidly
Visibility:90 miles
6-hr Max temp: 32F
6-hr Min temp: 17F
6-hr precip:   0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 11 ins.
BHO SA 1755 SKC 90 110/32/08/3117G27/985/ PK WND 3128/23/ 
4/011 57020 10032 20017

 
SUMMARY FOR SUNDAY, MARCH 18, 2018

TEMPERATURE (DEGREES F)
MAX.....31   NORMAL.....45
MIN.....10   NORMAL.....27
MEAN....21   NORMAL.....36

DEPARTURE FROM 30-YEAR NORMAL...........................-15
TOTAL DEPARTURE FOR THE MONTH............................-8 [-0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............44   DEPARTURE.........+15
TOTAL HEATING UNITS FOR THE MONTH............582   DEPARTURE.........+13
TOTAL HEATING UNITS FOR THE SEASON..........4704   DEPARTURE........-433
TOTAL HEATING UNITS LAST SEASON TO DATE.....4522   DIFFERENCE.......+182

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................39 NW  AT 2:53 P.M. 
                   AERO........................38 NW  AT 2:53 P.M.
                   ASOS........................41 WNW AT 2:53 P.M.
                   DAVIS.......................38 M   AT 2:53 P.M ** RMY 40
FASTEST MILE FOR YESTERDAY.....................26 NW  AT 2:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................26 NW  AT 3:22 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................26 M   AT 3:21 P.M.**
AVERAGE WIND SPEED AND DIRECTION.............13.3 NW
                   ASOS......................13.0  
                   DAVIS.....................11.9 ** 
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.19
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........7.97  DEPARTURE......+5.01
                         ASOS..............8.67  
TOTAL PRECIPITATION FOR THE YEAR..........18.08  DEPARTURE......+6.70
                         ASOS.............19.53

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH...............40.1  DEPARTURE.......+31.5
TOTAL SNOWFALL FOR THE SEASON..............84.8  DEPARTURE.......+29.1

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

3/01 61/37/49/+18/0.00/0.0/378/56    39 ENE AERO 37 ENE RMY N/A 
3/02 40/32/36/+5/3.47/0.7/000/00     73 NNE AERO 70 NNE RMY N/A
3/03 40/32/26/+4/T/T/034/05          52 NNE AERO 50 NNE RMY 49
3/04 39//34/37/+5/T/T/000/00         36 NNE AERO 32 NNE RMY 32 
3/05 40/29/35/+3/.../1.2/261/38      40 NE  AERO 39 NE  RMY 40
3/06 34/29/32/0/0.00/0.0/062/09      20 N   AERO 16 N   RMY N/A
3/07 35/31/33/0/..../.../000/00      52 ENE AERO 53 ENE RMY 50 
3/08 34/28/31/-2/..../.../000/00     44 NNE AERO 47 NNE RMY N/A
3/09 36/24/30/-3/T/T/265/38          28 W   AERO 26 W   RMY N/A 
3/10 37/28/33/0/0.00/0.0/343/49      38 WNW AERO 38 WNW RMY 41
3/11 42/26/34/0/0.00/0.0/.../..      28 NW  AERO 26 NW  RMY 29
3/12 39/26/33/-1/T/T/.../..          36 ENE AERO 33 ENE RMY N/A
3/13 35/26/31/-3/..../23.0/000/00    60 N   AERO 60 N   RMY 64
3/14 36/24/30/-5/..../.../470/66     38 WSW AERO 38 WSW RMY 41
3/15 40/29/35/0/..../.../422/59      44 W   AERO 44 W   RMY 44
3/16 35/23/29/-6/0.00/0.0/308/43     41 NW  AERO 41 NW  RMY 45
3/17 40/15/28/-8/0.00/0.0/.../...    46 W   AERO 45 W   RMY 49
3/18 31/10/21/-15/0.00/0.0/.../..    39 NW  AERO 38 NW  RMY 40

3/19 Low temp since midnight is 13F; normal low is now 27F

DAILY RECORDS FOR MARCH 2018

3/02/18: NEW DAILY RECORD MAXIMUM PRECIPITATION OF 3.47 INS.
         PREVIOUS RECORD WAS 2.15 INS. SET IN 1983

3/13/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 23.0 INS.
         PREVIOUS RECORD WAS 10.0 INS. SET IN 1993

3/13/18: NEW MONTHLY RECORD MAXIMUM DAILY SNOWFALL OF 23.0 INS.
         PREVIOUS RECORD WAS 18.0 INS. SET ON 8 MARCH 2013

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

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

RECORDS FOR MARCH 20
HIGH 79 IN 1945
LOW 4 IN 1885
PRECIP 1.39 INS. IN 1957
SNOWFALL 11.4 INS. IN 1957
PEAK GUST 63 MPH SE IN 1975

TODAY'S REPORT PREPARED BY: Kaitlin A. Geagan