BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 10, 2013  
ALL TIMES ARE IN EASTERN STANDARD TIME
  
MAXIMUM TEMPERATURE OF 72F ON TUESDAY WARMEST THIS YEAR TO DATE
WARMEST SINCE 73F ON OCTOBER 20, 2012
MONTH OF APRIL TEMPERATURES EDGE UP 1.5 DEG ABOVE AVERAGE
EARLY MORNING RAIN SHOWERS BRING ONLY LITTLE PRECIPITATION 
 
Yesterday was our first 70-degree day of the year to date
and was such a pleasant day like we had not experienced
so far this year and season. The average temperature for
the day was 14 degrees above the 30-year normal.  This
pulled the April average up to +1.5 degrees above average
through 10 days of the month.
 
Light rain showers in the pre-dawn hours of today left only
0,07 inch and the month continues to slide farther down on
dry side of average; now by over one inch. 
 
Today's observations:
 
7 A.M.
Weather: Overcast stratocumulus, few stratus fractus drifting below and at
the summit level, briefly over summit past hour, few small breaks in the
overcast, numerous bright spots in overcast, thin fog all quadrants
Temperature: 45F; Dew Point: 43F; Wind: E at 3 kts,
Wind: Light
Sea-level pressure: 29.95 ins. Hg, rising slightly
Visibility: 12 miles, except 7 miles NNW-ESE, thin fog all quadrants
6-hr precip:  0.07 inch
24-hr precip: 0.07 inch
6-hour min. temp: 43F
BHO SA 1155 E43 OVC 12 141/45/43/0903/995/ FEW STFRA DRFTG BLO SMT AND
AT SMT LVL ALQDS BRFLY OVR SMT PST HR SML BINOVC NMRS BRGHT SPTS IOVC
VSBY NNW-ESE 7 THN F ALQDS WND LGT/ 8/5// 53004 MANUAL 6007/ 70007
ASOS 60006 70006 10046 20043 
 
10 A.M.
Weather:  Scattered stratocumulus, 2 levels, scattered
cirrus, higher layer thin, few lower cumulus fractus, cumulus
Temperature: 52F; Dew Point: 45F; Wind: NE at 7 kts,
Wind: Direction variable N-ENE
Sea-level pressure: 29.96 ins. Hg, rising slightly
Visibility: 20 miles, hazy 
BHO SA 1455 28 SCT 43 SCT 250 SCT 300 –SCT 20 147/52/45/0407/996/
FEW LWR CU HAZY WND 01V07/ 8/801 51006
 
1 P.M.
Weather: Scattered stratocumulus/stratocumulus lenticularis,
thin scattered cirrostratus 
Temperature: 59F; Dew Point: 44F; Wind: Calm
Wind: Light and variable
Sea-level pressure: 29.97 ins. Hg, steady
Visibility: 30 miles, hazy
6-hr max. temp: 60F
BHO SA 1755 45 SCT 300 –SCT 30 148/59/44/0000/997/ CUFRA/SML CU FRMG
SE-SW-NW SC/SCSL W-N-E CS LYR NW-NE WND L/V/ 8/808 50001 10060 20045
 
WEATHER SUMMARY FOR TUESDAY, APRIL 9
 
TEMPERATURE (DEGREES F)
MAX.....72     NORMAL.....53
MIN.....44     NORMAL.....35                         
MEAN....58     NORMAL.....44  
 
DEPARTURE FROM 30-YEAR NORMAL...................+14
TOTAL DEPARTURE FOR THE MONTH...................+15 [+1.5 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY.............7   DEPARTURE.........-14
TOTAL HEATING UNITS FOR THE MONTH...........187   DEPARTURE.........-15
TOTAL HEATING UNITS FOR THE SEASON.........5207   DEPARTURE........-478
TOTAL HEATING UNITS LAST SEASON TO DATE....4471   DIFFERENCE.......+736
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............35 WNW AT 11:43 A.M.
                   AERO....................35 WNW AT 11:43 A.M. 
                   ASOS....................38 WNW AT 11:43 A.M.
                   DAVIS...................36 W   AT 11:43 A.M. RMY: 39
THE FASTEST MILE FOR YESTERDAY.............29 W   AT 11:41 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..............28 W   AT 11:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............25 W   AT 11:44 A.M.
AVERAGE WIND SPEED AND DIRECTION.........12.8 WNW
                   ASOS..................12.2
                   DAVIS.................11.7 SW [220 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07  DEPARTURE...........-0.10
                         ASOS..............0.06
TOTAL PRECIPITATION FOR THE MONTH..........0.41  DEPARTURE...........-1.11
                         ASOS..............0.41
TOTAL PRECIPITATION FOR THE YEAR..........14.50  DEPARTURE...........-1.02
                         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............-0.2
TOTAL SNOWFALL FOR THE MONTH.............Trace   DEPARTURE............-1.5
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+37.8
 
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
4/2  40/27/34/-7/T/T/460/460/60      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/.../..     51 S   AERO 46 MPH S   RMY 50
4/8  65/43/54/+10/T/0.0/.../..       29 SSW AERO 22 MPH SSW RMY N/A
4/9  72/44/58/+14/T/0.0/.../..       35 WNW AERO 35 MPH WNW RMY 39
 
4/10 the morning low temp: 43F; the normal low is now 36F
 
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 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967
 
RECORDS FOR APRIL 11
HIGH 78 IN 1945
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963
 
TODAY'S REPORT PREPARED BY: Robert Skilling