BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 28, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
DRY, SUNNY STRETCH CONTINUES WITH WARMER TEMPERATURES
 
For the third day in a row, mostly sunny skies have been the story at the
summit today.  Winds have been fairly light and variable again today, and
the temperature has risen to a high of 69F so far by early this afternoon,
putting us well above our average high temperature for this time of year of 60F.
Today's visibility has been running a bit lower than yesterday's due to a
persistent haze that has kept the visibility at 50 miles or less.
 
The average monthly temperature continues to remain about a degree
above normal, and is expected to remain this way through the end
of the month. Our precipitation deficit for the month is climbing closer to
two inches, and with no precipitation expected for the rest of the month this
should finish as a drier than normal April. In addition, this month will likely
be the second April in a row with no measurable snowfall, the first time this
has happened since April 1994 and April 1995.
 
Today's observations:
 
7 A.M.
Weather: Clear, few altocumulus distant N-NE, thin smoke layer SW-NE
Temperature: 51F; Dew Point: 33F; Wind: WSW at 5 kts,
Wind: Light
Sea-level pressure: 30.34 ins. Hg, rising then rising more rapidly
Visibility: 40 miles, light distant haze
6-hour min. temp: 44F
BHO SA 1155 CLR 40 273/51/33/2505/034/ FEW AC DSNT N-NE LT DSNT HZ
THN K LYR SW-NE WND LGT/ 8/070 53014 10051 20044
 
10 A.M. 
Weather: Sky perfectly clear [SKC]
Temperature: 63F; Dew Point: 31F; Wind: SSE at 10G17 kts,
Wind: Direction variable ESE-SSW
Sea-level pressure: 30.33 ins. Hg, rising then falling 
Visibility: 45 miles, light distant haze
BHO SA 1455 CLR 45 271/63/31/1610G17/033/ SKC LGT DSNT HZ WND 12V20/ 8/000 50002
 
1 P.M. 
Weather: Clear, few cumulus and cumulus fractus all quadrants
Temperature: 65F; Dew Point: 32F; Wind: SSE at 8 kts,
Wind: Direction variable SE-SSW
Sea-level pressure: 30.28 ins. Hg, falling then falling more slowly   
Visibility: 50 miles, light distant haze
6-hour max. temp: 69F
BHO SA 1755 CLR 50 254/65/32/1608/028/ FEW CU AND CUFRA ALQDS LGT DSNT HZ
WND 13V20/ 8/200 56017 10069 20051
 
WEATHER SUMMARY FOR SATURDAY, APRIL 27
 
TEMPERATURE (DEGREES F)
MAX.....62     NORMAL.....60
MIN.....42     NORMAL.....42                         
MEAN....52     NORMAL.....51             
 
DEPARTURE FROM 30-YEAR NORMAL....................+1
TOTAL DEPARTURE FOR THE MONTH...................+30 [+0.9 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY............13   DEPARTURE..........-1
TOTAL HEATING UNITS FOR THE MONTH...........480   DEPARTURE.........-31
TOTAL HEATING UNITS FOR THE SEASON.........5500   DEPARTURE........-494
TOTAL HEATING UNITS LAST SEASON TO DATE....4679   DIFFERENCE.......+821
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............21 S   AT  6:47 P.M. * 
                   AERO....................17 S   AT  6:38 P.M. * 
                   ASOS....................22 S   AT  6:15 P.M.
                   DAVIS...................22 S   AT  6:14 P.M.  RMY: 22
THE FASTEST MILE FOR YESTERDAY.............17 S   AT  6:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..............17 S   AT  6:10 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............16 S   AT  6:10 P.M. 
AVERAGE WIND SPEED AND DIRECTION..........7.7 S      
                   ASOS...................7.7
                   DAVIS..................7.0 SE [144 deg]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE...........-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.29  DEPARTURE...........-1.86
                         ASOS..............2.23
TOTAL PRECIPITATION FOR THE YEAR..........16.38  DEPARTURE...........-1.77
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals
                       
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0   DEPARTURE............ 0.0
TOTAL SNOWFALL FOR THE MONTH.............Trace   DEPARTURE............-2.9
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+36.4
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
4/1  61/31/46/+5/0.34/0.0/458/60     40 W   AERO 44 MPH WNW RMY 46  TSTM
4/2  40/27/34/-7/T/T/460/60          45 W   AERO 42 MPH W   RMY 47
4/3  45/27/36/-6/0.00/0.0/755/98     44 W   AERO 43 MPH W   RMY 47
4/4  55/26/41/-1/0.00/0.0/719/93     30 WSW AERO 27 MPH WSW RMY 31
4/5  59/36/48/+5/0.00/0.0/403/52     33 NNW AERO 28 MPH NNW RMY 38
4/6  47/30/39/-4/0.00/0.0/747/96     38 NW  AERO 35 MPH NW  RMY 40 
4/7  52/31/42/-1/0.00/0.0/391/50     51 S   AERO 46 MPH S   RMY 50
4/8  65/43/54/+10/T/0.0/494/63       29 SSW AERO 22 MPH SSW RMY N/A
4/9  72/44/58/+14/T/0.0/456/58       35 WNW AERO 35 MPH WNW RMY 39  TSTM
4/10 64/43/54/+9/0.13/0.0/426/54     23 SE  AERO 20 MPH SE  RMY 25
4/11 52/40/46/+1/0.09/0.0/063/08     18 ENE AERO 14 MPH ENE RMY N/A
4/12 40/34/37/-8/0.58/T/000/00       38 E   AERO 32 MPH E   RMY 41
4/13 52/34/43/-3/0.04/0.0/128/16     31 NNE AERO 27 MPH NNE RMY 21
4/14 52/36/44/-2/0.00/0.0/216/27     31 WNW AERO 27 MPH WNW RMY 32
4/15 55/35/45/-2/0.00/0.0/514/64     21 ESE AERO 15 MPH S   RMY N/A
4/16 62/38/50/+3/T/0.0/540/67        44 S   AERO 40 MPH S   RMY 45
4/17 67/48/58/+11/T/0.0/769/95       29 SSW AERO 25 MPH SSW RMY N/A
4/18 65/43/54/+6/0.00/0.0/503/62     30 S   AERO 25 MPH S   RMY N/A
4/19 72/50/61/+13/0.07/0.0/195/24    47 SSW AERO 48 MPH SSW RMY 50
4/20 62/39/51/+2/0.48/0.0/147/18     43 SSW AERO 41 MPH SSW RMY N/A
4/21 53/31/42/-7/0.00/0.0/819/100    31 WNW AERO 25 MPH WNW RMY N/A
4/22 49/35/42/-7/0.00/0.0/.../..     32 E   AERO 28 MPH E   RMY 33
4/23 40/38/39/-11/0.50/0.0/000/00   35 NNE AERO 30 MPH NNE RMY 35
4/24 72/40/56/+6/0.01/0.0/.../..     36 SSW AERO 33 MPH SSW RMY N/A
4/25 64/44/54/+4/0.05/0.0/.../..     38 W   AERO 32 MPH W   RMY N/A
4/26 58/42/50/-1/0.00/0.0/.../..     28 ENE AERO 22 MPH ENE RMY N/A 
4/27 62/42/52/+1/0.00/0.0/.../..     21 S   AERO 17 MPH S   RMY 22
 
4/28 morning low temp: 44F; the normal low is now 42F
 
DAILY RECORDS FOR APRIL 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967
 
RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien