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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MARCH 10, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

BREEZY DAY STARTS OUT PARTLY SUNNY BUT 
CLOUDS INCREASE BY AFTERNOON...

After a lighter wind day yesterday breezy
conditions have returned to Great Blue Hill. 
Wind from the west began to pick up after 
7:00 A.M. this morning and so far we have a 
peak gust of 33 kts (38 MPH) by 1:00 P.M.
Temperatures have been close to or slightly 
below seasonable with a high yesterday of 36F, 
which is 6 degrees below the daily normal of 
42F. Our low yesterday was a seasonable 24F. 
So far today our low temperature since midnight 
of 28F is slightly above seasonable of 25F. So
far today we have a max of 37F, which is
5 degrees below the daily normal of 42F. 
With fairly low humidity we had great
visibility in the morning. With a distant fog
moving in, in the afternoon. The morning
started with partly sunny skies again but
clouds increased throughout the day with the 
sky mostly covered in clouds by 1:00 P.M. 
We had a few scattered snow showers yesterday
but we only measured a trace this morning. 

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrostratus,
few cumulus offshore NNE-NE 
Temperature: 30F; Dew Point: 24F; Wind: W at 14G21 kts
Sea-level pressure: 29.76 ins. Hg, rising, then more rapidly          
Visibility: 70 miles
6-hr Max temp: 30F
6-hr Min temp: 28F
24-hr precip:  Trace
24-hr snowfall: Trace
Snow depth: 9 ins.
BHO SA 1155 120 SCT 200 SCT 70 077/30/24/2714G21/976/ NEW 
SNW PST 24 HRS TRACE FEW CU OFFSHR NNE-NE/ 8/161 4/009 
53008 10030 20028

10 A.M.
Weather: Broken stratocumulus 
Temperature: 34F; Dew Point: 25F; Wind: W at 15G30 kts,
Peak Wind: 32 kts (37 MPH) W at 9:40 A.M.
Sea-level pressure: 29.77 ins. Hg, rising then falling
Visibility: 75 miles
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.    
BHO SA 1455 E40 BKN 75 080/34/25/2815G30/977/ PK WND 2832/40/ 
8/400 52003 

1 P.M.
Weather: Broken stratocumulus 
Temperature: 35F; Dew Point: 27F; Wind: W at 16G24 kts,
Peak Wind: 33 kts (38 MPH) W at 12:38 P.M.
Sea-level pressure: 29.75 ins. Hg, rising then falling 
Visibility: 40 miles, distant fog in all directions 
6-hr Max temp: 37F
6-hr Min temp: 28F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 8 ins.
BHO SA 1755 E50 BKN 45 073/35/27/2816G24/975/ DSNT FG ALQDS 
PK WND 2833/38/ 8/400 4/008 56007 10037 20028   
 
SUMMARY FOR FRIDAY, MARCH 9, 2018

TEMPERATURE (DEGREES F)
MAX.....36   NORMAL.....42
MIN.....24   NORMAL.....24
MEAN....30   NORMAL.....33

DEPARTURE FROM 30-YEAR NORMAL............................-3
TOTAL DEPARTURE FOR THE MONTH...........................+30 [+3.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............35   DEPARTURE..........+3
TOTAL HEATING UNITS FOR THE MONTH............266   DEPARTURE.........-30
TOTAL HEATING UNITS FOR THE SEASON..........4388   DEPARTURE........-476
TOTAL HEATING UNITS LAST SEASON TO DATE.....4153   DIFFERENCE.......+235

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................28 W AT  2:35 P.M. 
                   AERO........................26 W AT  2:35 P.M.
                   ASOS........................28 W AT  2:35 P.M.
                   DAVIS.......................27 M AT  2:35 P.M ** RMY N/A
FASTEST MILE FOR YESTERDAY.....................18 W AT  3:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................18 W AT 11:59 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................18 M AT  3:22 P.M.**
AVERAGE WIND SPEED AND DIRECTION.............11.8 W 
                   ASOS......................11.9  
                   DAVIS.....................10.5 ** 
** Davis direction malfunctioning

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..........5.76  DEPARTURE......+4.37
                         ASOS..............6.32  
TOTAL PRECIPITATION FOR THE YEAR..........15.87  DEPARTURE......+6.06
                         ASOS.............17.17

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH...............16.9  DEPARTURE.......+12.3
TOTAL SNOWFALL FOR THE SEASON..............61.6  DEPARTURE........+9.9

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

2/1  45/27/36/+10/0.06/0.0/120/20      36 SSW AERO 35 SSW RMY N/A 
2/2  34/08/21/-5/0.25/2.5/223/37       43 WNW AERO 46 WNW RMY 46 
2/3  25/04/15/-11/0.00/0.0/557/92      26 S   AERO 24 S   RMY 30 
2/4  45/23/34/+8/0.32/T/000/00          31 SSE AERO 29 S   RMY 30
2/5  46/19/33/+7/0.36/0.0/464/76       47 WNW AERO 47 WNW RMY 44
2/6  31/17/24/+2/T/T/025/04            26 SSW AERO 23 SSW RMY 23 
2/7  42/21/32/+5/0.62/1.1/000/00       45 SW  AERO 46 SW  RMY 47
2/8  30/20/25/-2/0.00/0.0/501/81       38 WNW AERO 38 WNW RMY N/A
2/9  30/16/23/-4/0.00/0.0/384/62       28 S   AERO 25 S   RMY N/A
2/10 51/28/40/+13/0.20/0.0/000/00      31 S   AERO 30 S   RMY 31
2/11 46/36/41/+14/0.70/0.0/000/00      24 SW  AERO 21 SW  RMY N/A
2/12 53/27/40/+13/0.00/0.0/132/21      33 WNW AERO 33 WNW RMY N/A
2/13 31/21/26/-2/0.00/0.0/496/79       22 S   AERO 18 WNW RMY 21
2/14 46/25/36/+8/0.00/0.0/234/37       30 S   AERO 26 SSW RMY 29 
2/15 47/35/41/+13/0.02/0.0/000/00      23 SSW AERO 20 SSW RMY N/A
2/16 50/31/41/+13/0.02/0.0/000/00      45 W   AERO 44 W   RMY 42
2/17 38/23/31/+3/0.21/2.0/468/73       33 SSW AERO 29 SSE RMY 33
2/18 42/29/35/+6/0.39/3.8/451/70       32 WNW AERO 29 WNW RMY 34 
2/19 48/30/39/+10/0.09/0.0/518/80      39 SSW AERO 37 SSW RMY 40       
2/20 68/48/58/+29/0.01/0.0/461/71      32 SSW AERO 30 SSW RMY N/A
2/21 70/50/60/+31/0.00/0.0/456/70      32 SW  AERO 30 SW  RMY 33
2/22 53/30/42/+13/0.10/0.8/000/00      30 N   AERO 28 N   RMY N/A 
2/23 41/28/35/+5/0.20/0.0/217/33       34 SW  AERO 20 SW  RMY N/A
2/24 54/35/45/+15/T/0.0/297/45         32 W   AERO 30 W   RMY 29
2/25 39/33/36/+6/0.56/T/000/00         33 ESE AERO 30 ESE RMY 33
2/26 48/35/42/+12/0.00/0.0/213/32      29 WNW AERO 25 WNW RMY 28
2/27 51/29/40/+9/0.00/0.0/669/100      26 WNW AERO 23 WNW RMY 25
2/28 59/37/48/+17/0.01/0.0/571/85      28 SSW AERO 25 SSW RMY 27 

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/.../..    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/.../..          52 NNE AERO 50 NNE RMY 49
3/04 39//34/37/+5/T/T/.../..         36 NNE AERO 32 NNE RMY 32 
3/05 40/29/35/+3/.../1.2/.../..      40 NE  AERO 39 NE  RMY 40
3/06 34/29/32/0/0.00/0.0/.../..      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/..../.../.../..     44 NNE AERO 47 NNE RMY N/A
3/09 36/24/30/-3/T/T/.../..          28 W   AERO 26 W   RMY N/A 

3/10 Low temp since midnight is 28F; normal low is now 25F

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

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

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

RECORDS FOR MARCH 11
HIGH 65 IN 1967
LOW 4 IN 1939, 1960
PRECIP 2.11 INS. IN 1901
SNOWFALL 6.3 INS. IN 1934
PEAK GUST 66e MPH W IN 1980

TODAY'S REPORT PREPARED BY: Kaitlin Geagan