BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 27, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
ANOTHER CALM, BEAUTIFUL DAY
 
Mostly clear skies have prevailed again today at the summit as the weather
continues to stay calm thanks to a strong high pressure system over New England.
Temperatures have risen to a high of 61F by early this afternoon. Skies were
predominantly clear this morning, before cumulus and cirrostratus clouds arrived
from late morning through the afternoon. Winds have been very light to even calm
at times, with a variable direction. Visibility has been limited a bit by haze,
especially early this morning, and has been mostly around 55 miles since
mid-morning.
 
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 patches of stratus fractus below summit SE and S-SSW,
cumulus distant offshore E-SE, smoke layer S-N
Temperature: 47F; Dew Point: 38F; Wind: NE at 5 kts,
Wind: Light
Sea-level pressure: 30.42 ins. Hg, rising then steady
Visibility: 35 miles, distant haze
6-hour min. temp: 42F
BHO SA 1155 CLR 35 302/47/38/0505/042/ FEW PTCHS STFRA BLW SMT SE AND S-SSW
CU DSNT OFFSHR E-SE DSNT HZ K LYR S-N WND LGT/ 8/200 51007 10047 20042
 
10 A.M. 
Weather: Clear, few cumulus SSW-N and SE, cirrus and cirrostratus S-NNW
Temperature: 56F; Dew Point: 33F; Wind: E at 1 kt,
Wind: Light
Sea-level pressure: 30.42 ins. Hg, steady then rising 
Visibility: 55 miles, light distant haze
BHO SA 1455 CLR 55 303/56/33/1001/042/ FEW CU SSW-N AND SE CI AND CS S-NNW
LGT DSNT HZ WND LGT/ 8/207 53001
 
1 P.M. 
Weather: Scattered cumulus, scattered cirrostratus, few cirrus
Temperature: 60F; Dew Point: 30F; Wind: E at 11 kts
Sea-level pressure: 30.37 ins. Hg, steady then falling  
Visibility: 55 miles, light distant haze
6-hour max. temp: 61F
BHO SA 1755 BHO SA 1755 40 SCT 200 SCT 60 286/60/30/0811/037/ FEW CI LGT DSNT HZ
8/201 58017 10061 20047
 
WEATHER SUMMARY FOR FRIDAY, APRIL 26
 
TEMPERATURE (DEGREES F)
MAX.....58     NORMAL.....60
MIN.....42     NORMAL.....42                         
MEAN....50     NORMAL.....51             
 
DEPARTURE FROM 30-YEAR NORMAL....................-1
TOTAL DEPARTURE FOR THE MONTH...................+29 [+0.9 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY............15   DEPARTURE..........+1
TOTAL HEATING UNITS FOR THE MONTH...........467   DEPARTURE.........-30
TOTAL HEATING UNITS FOR THE SEASON.........5487   DEPARTURE........-493
TOTAL HEATING UNITS LAST SEASON TO DATE....4640   DIFFERENCE.......+847
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............28 ENE AT  3:56 A.M. 
                   AERO....................22 ENE AT  3:56 A.M. 
                   ASOS....................26 E   AT  5:58 A.M.
                   DAVIS...................26 ENE AT  4:13 A.M.  RMY: N/A
THE FASTEST MILE FOR YESTERDAY.............21 ENE AT  3:53 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..............20 ENE AT  4:00 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............19 NE  AT  3:56 A.M. 
AVERAGE WIND SPEED AND DIRECTION.........11.8 E      
                   ASOS..................11.3
                   DAVIS.................10.8 E [61 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE...........-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.29  DEPARTURE...........-1.73
                         ASOS..............2.23
TOTAL PRECIPITATION FOR THE YEAR..........16.38  DEPARTURE...........-1.64
                         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 morning low temp: 42F; 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 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941
 
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
 
TODAY'S REPORT PREPARED BY: Jonathan O'Brien