BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 29, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
STILL ANOTHER DRY DAY WITH HIGH CLOUDS CLEARING AWAY
TEMPERATURES RISING TO NEAR 70F WITH DEW POINT DOWN
IN THE 30;S AND RELATIVE HUMIDITY IN THE 30% RANGE
 
The high clouds of early today have cleared away to the
south by this afternoon leaving us with plenty of bright
warm sunshine.  Temperatures have risen to about where
they were yesterday by early afternoon.
The air mass continues to be very dry with dew points
dropping into the 30's  Winds are light from the south. 
 
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 now at
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: Broken dense cirrostratus, overcast cirrostratus, overcast is
partly thin, thin fog 
Temperature: 50F; Dew Point: 44F; Wind: S at 5 kts,
Sea-level pressure: 30.34 ins. Hg, rising then rising more rapidly
Visibility: 15 miles, except 25 miles WNW, thin fog all quadrants
6-hour min. temp: 46F
BHO SA 1155 E220 BKN 250 OVC 15 256/50/44/1906/029/ OVC PTLY THN
VSBY WNW 25 THN F ALQDS/ 8/007 53012 10050 20046
 
10 A.M. 
N/A
 
1 P.M. 
Weather: Scattered cumulus, scattered dense cirrostratus layer
SE-SW, scattered cirrus, layer thin 
Temperature: 68F; Dew Point: 37F; Wind: S at 10 kts,
Wind: Direction variable SSE-WSW
Sea-level pressure: 30.23 ins. Hg, falling then more rapidly   
Visibility: 35 miles, WNW 45, distant haze all quadrants
6-hour max. temp: 68F 
BHO SA 1755 60 SCT 200 SCT 250 SCT 35 236/68/37/1910/023/ DNS CS LYR
MSTLY DSNT SE-SW 250 LYR THN WND 15V24/ 8/102 58017 10068 20050
 
WEATHER SUMMARY FOR SUNDAY, APRIL 28
 
TEMPERATURE (DEGREES F)
MAX.....69     NORMAL.....61
MIN.....44     NORMAL.....42                         
MEAN....57     NORMAL.....52             
 
DEPARTURE FROM 30-YEAR NORMAL....................+5
TOTAL DEPARTURE FOR THE MONTH...................+35 [+1.1 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............8   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH...........488   DEPARTURE.........-37
TOTAL HEATING UNITS FOR THE SEASON.........5508   DEPARTURE........-501
TOTAL HEATING UNITS LAST SEASON TO DATE....4679   DIFFERENCE.......+829
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............25 S   AT  4:42 P.M.  
                   AERO....................21 S   AT  4:42 P.M.  
                   ASOS....................26 S   AT  4:43 P.M. 
                   DAVIS...................25 S   AT  3:24 P.M. RMY: 27
THE FASTEST MILE FOR YESTERDAY.............21 S   AT  4:56 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE..............21 S   AT  4:57 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............20 S   AT  3:25 P.M.  
AVERAGE WIND SPEED AND DIRECTION.........10.6 S
                   ASOS..................10.8
                   DAVIS..................9.7 SSW [200 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...........-2.00
                         ASOS..............2.23
TOTAL PRECIPITATION FOR THE YEAR..........16.38  DEPARTURE...........-1.91
                         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............-3.0
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+36.3
 
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 69/44/57/+5/0.00/0.0/.../..     25 S   AERO 21 MPH S   RMY 27
    
4/29  morning low temp: 46F; the normal low is now 43F
 
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 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
 
RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978
 
TODAY'S REPORT PREPARED BY: Robert Skilling