BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MARCH 27, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNNY, COOL, AND VERY DRY TODAY....
 
Temperatures were once again well-below normal on Sunday
as Canadian high pressure continues to filter into the
region. This morning's low of 22F was only slightly
higher than yesterday's low of 20F. Early on, sky coverage
was mostly cloudy with broken cirrus. However, by 11AM EDT
intense sunshine had burned off these clouds leaving clear
conditions throughout the late morning and early afternoon.
 
Meanwhile, very dry air is associated with this pressure
system as the relative humidity has dipped into the upper teens
and dew points are in the low to mid single digits! Resulting
visibilities have been as high as 85 miles with Mount Monadnock
in clear view. Winds are averaging 15 MPH out of the west with
gusts as high as 35 MPH.
 
Today's observations:
 
7 A.M.  
Weather: Broken cirrus, patches of dense cirrus NNW-ENE,
virga all quadrants
Temperature: 26F, Dew point: 11F; Wind: W at 11G22 kts
Wind: Direction variable SW to WNW
Sea-level pressure: 29.89 ins. Hg, rising
Visibility: 75 miles
6-hour min. temp: 22F 
BHO SA 1155 E250 BKN 75 120/24/11/2611G22/989/ PTCHS DENS
CI NNW-ENE VIRGA ALQDS WND 23V30/ 8/002 55003 10026 20022
 
10 A.M.  
Weather: Perfectly clear sky
Temperature: 33F, Dew point: 7F; Wind: W at 13G24 kts,
Wind: Direction variable SW to NW 
Sea-level pressure: 29.85 inches Hg, falling
Visibility: 80 miles
BHO SA 1455 CLR 80 109/33/7/2613G24/985/ SKC WND 23V31/
58011
 
1 P.M.   
Weather: Perfectly clear sky
Temperature: 42F, Dew point: 3F; Wind: W at 14G26 kts,
Wind: Peak gust 31 kts, W at 12:07 P.M. EST
Wind: Direction variable SW to WNW
Sea-level pressure: 29.77 inches Hg, falling
Visibility: 85 miles
6-hour max. temp. 42F
BHO SA 1755 CLR 85 082/42/3/2514G26/977/ SKC PK WND 2631/07
WND 22V29/ 57027 10042 20024
    
 
WEATHER SUMMARY FOR SATURDAY, MARCH 26
 
TEMPERATURE (DEGREES F)
MAX.....39     NORMAL.....48
MIN.....20     NORMAL.....31
MEAN....30     NORMAL.....39
 
DEPARTURE FROM 30-YEAR NORMAL...................-9
TOTAL DEPARTURE FOR THE MONTH..................+34 [+1.1 DEGREES/DAY]
 
HEATING DEGREE DAYS    
TOTAL HEATING UNITS FOR YESTERDAY............35    DEPARTURE........+9
TOTAL HEATING UNITS FOR THE MONTH...........733    DEPARTURE.......-38
TOTAL HEATING UNITS FOR THE SEASON.........5255    DEPARTURE.......-86
TOTAL HEATING UNITS LAST SEASON TO DATE....4975    DIFFERENCE.....+280
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............40 WNW AT  4:03 P.M.  
                   AEROVANE...............40 W   AT  3:33 P.M.  
                   ASOS...................39 WNW AT  4:04 P.M.  
                   DAVIS..................41 W   AT  4:03 P.M.  
THE FASTEST MILE FOR YESTERDAY............30 W   AT  4:03 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.............28 W   AT  4:59 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE............30 W   AT  4:04 P.M. 
AVERRAGE WIND SPEED AND DIRECTION.......15.8 W
                   ASOS.................14.1 
                   DAVIS................15.2 W [278 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE........-0.16
                         ASOS..............0.00   
TOTAL PRECIPITATION FOR THE MONTH..........2.25  DEPARTURE........-1.78
                           ASOS............2.31  
TOTAL PRECIPITATION FOR THE YEAR..........13.18  DEPARTURE........+0.31
                        ASOS..............13.92**
** ASOS data is in error due to system failure on 1/12-13   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.3
TOTAL SNOWFALL FOR THE MONTH................2.5  DEPARTURE........-7.9
TOTAL SNOWFALL FOR THE SEASON..............92.2  DEPARTURE.......+36.4
 
PRELIMINARY CLIMATE SUMMARY FOR MARCH 2011 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
3/1  36/27/32/0/0.00/0.0/580/86      37 WNW  AERO 40 MPH WNW
3/2  45/18/32/0/T/T/264/39           51 W    AERO 53 MPH W
3/3  27/8/18/-14/0.00/0.0/659/97     36 WNW  AERO 40 MPH WNW
3/4  37/15/26/-7/0.00/0.0/540/79     24 SSE
3/5  53/27/40/+7/T/0.0/158/23        48 SSW  AERO 53 MPH SSW
3/6  59/46/53/+20/0.16/0.0/028/04    48 S    AERO 56 MPH S
3/7  54/25/40/+7/0.64/T/159/23       58 SE   AERO 62 MPH SSE
3/8  41/22/32/-2/0.00/0.0/638/92     23 NW 
3/9  34/28/31/-3/T/T/049/07          31 NE   AERO 32 MPH NE
3/10 40/32/36/+2/0.06/T/000/00       37 E    AERO 39 MPH E
3/11 54/40/47/+12/0.46/0.0/000/00    40 E    AERO 40 MPH E
3/12 51/34/43/+8/0.00/0.0/550/78     35 SW   AERO 37 MPH WSW 
3/13 48/36/42/+7/T/0.0/326/46        39 W    AERO 42 MPH W
3/14 37/28/33/-3/0.01/T/021/03       20 NW
3/15 47/28/38/+2/0.00/0.0/635/89     23 SSE
3/16 43/30/37/+1/0.54/0.0/000/00     25 WNW
3/17 61/35/48/+10/0.00/0.0/677/94    27 S    AERO 29 MPH S
3/18 69/43/56/+19/0.00/0.0/448/62    58 W    AERO 58 MPH W
3/19 50/30/40/+3/T/0.0/421/58        31 NW   AERO 32 MPH NW
3/20 42/26/34/-4/0.00/0.0/677/93     23 SE
3/21 38/31/35/-3/0.33/2.0/000/00     29 SSE  AERO 31 MPH SSE
3/22 40/30/35/-3/0.00/0.0/132/18     36 WNW  AERO 37 MPH WNW  
3/23 38/27/33/-5/T/T/177/24          20 WNW
3/24 36/27/32/-7/0.05/0.5/.../..     27 NW   AERO 31 MPH NW
3/25 43/25/34/-5/0.00/0.0/.../..     32 WSW  AERO 35 MPH WSW
3/26 39/20/30/-9/0.00/0.0/.../..     40 WNW  AERO 40 MPH WNW
 
3/27 morning low temp: 22F; the normal low is now 31F.  
 
DAILY RECORDS FOR MARCH 2011
3/18 - NEW RECORD HIGH MAXIMUM TEMPERATURE OF 69F;
surpasses the previous record of 68F in 1999
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MARCH 27
HIGH 78 IN 1998
LOW 12 IN 1975
PRECIP 1.05 INS. IN 1913
SNOWFALL 6.6 INS. IN 1959
PEAK GUST 62 MPH NW IN 1965, SE IN 1992
 
RECORDS FOR MARCH 28
HIGH 86 IN 1998
LOW 7 IN 1923
PRECIP 2.31 INS. IN 1932
SNOWFALL 3.0 INS. IN 1932
PEAK GUST 60e MPH NW IN 1944, 60 WSW IN 1991
 
TODAY'S REPORT PREPARED BY: Eli Melaas