BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 6, 2013  
ALL TIMES ARE IN EASTERN STANDARD TIME

MUCH COOLER AND DRIER TODAY WITH BRIGHT SUNSHINE

High pressure is moving into the area today, and much cooler
temperatures and much drier air are returning. After a high
temperature of 59 deg F on Friday, the low dropped to 30 deg F this
morning. The dew point has dropped from the 20s on Friday into
the low single digits today.  As a result, the relative humidity
is once again very low today near 20%. Stronger winds that 
returned last evening are continuing into today. The peak gust 
on Friday was 33 mph NW at 9:24 PM EDT, and the peak gust so far 
today has been 37 mph NW at 9:15 AM EDT. Visibility has been
excellent today, reaching 80 miles this afternoon. 


Today's observations:

7 A.M.
Weather: Scattered cumulus, few cumulus fractus all quadrants, 
few cirrus distant S-SW
Temperature: 31F; Dew Point: 9F; Wind: NW at 17G28 kts,
Wind: Peak gust 29 kts, NW at 6:35 AM
Wind: Direction variable WNW-N
Sea-level pressure: 30.13 ins. Hg, rising
Visibility: 70 miles
6-hour min. temp: 30F
BHO SA 1155 45 SCT 70 203/31/9/3217G28/013/ FEW CUFRA ALQDS FEW CI DSNT 
S-SW PK WND 3229/35 WND 29V35/ 8/101 51041 10035 20030

10 A.M. 
Weather: Clear, few small cumulus distant ESE
Temperature: 35F; Dew Point: 7F; Wind: NW at 17G24 kts,
Wind: Peak gust 27 kts, NW at 9:37 AM
Wind: Direction variable WNW-N
Sea-level pressure: 30.20 ins. Hg, rising
Visibility: 75 miles
BHO SA 1455 CLR 75 227/35/7/3217G24/020/ FEW SML CU DSNT ESE PK WND 
3227/37 WND 29V35/ 8/100 51024
 
1 P.M. 
Weather: Sky completely clear (SKC)
Temperature: 43F; Dew Point: 4F; Wind: NW at 12G26 kts,
Wind: Peak gust 29 kts, NW at 11:59 AM
Wind: Direction variable WNW-N
Sea-level pressure: 30.22 ins. Hg, rising
Visibility: 80 miles
6-hour max. temp: 43F
BHO SA 1755 CLR 80 232/43/4/3212G26/022/ SKC PK WND 3229/1659 WND 29V35/ 
8/000 53005 10043 20031 

WEATHER SUMMARY FOR FRIDAY, APRIL 5

TEMPERATURE (DEGREES F)
MAX.....59     NORMAL.....51
MIN.....36     NORMAL.....34					
MEAN....48     NORMAL.....43   
 
DEPARTURE FROM 30-YEAR NORMAL....................+5
TOTAL DEPARTURE FOR THE MONTH....................-4 [-1.0 DEGREE/DAY]
 
HEATING DEGREE DAYS  
TOTAL HEATING UNITS FOR YESTERDAY............17	  DEPARTURE..........-5
TOTAL HEATING UNITS FOR THE MONTH...........120   DEPARTURE..........+4
TOTAL HEATING UNITS FOR THE SEASON.........5140   DEPARTURE........-460
TOTAL HEATING UNITS LAST SEASON TO DATE....4389   DIFFERENCE.......+751

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...............33 NNW AT  8:24 P.M.
                   AERO....................28 NNW AT  7:45 P.M. *
                   ASOS....................32 NNW AT  8:25 P.M.
                   DAVIS...................30  NW AT  5:50 P.M. RMY: 38
THE FASTEST MILE FOR YESTERDAY.............24 NNW AT  7:44 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..............22 NNW AT  8:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.............N/A
AVERAGE WIND SPEED AND DIRECTION.........14.3  SW
                   ASOS..................13.0
                   DAVIS.................12.8 WSW [246 deg]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE...........-0.17
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.34  DEPARTURE...........-0.51
                         ASOS..............0.35
TOTAL PRECIPITATION FOR THE YEAR..........14.43  DEPARTURE...........-0.42
                         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............-0.1
TOTAL SNOWFALL FOR THE MONTH.............Trace   DEPARTURE............-0.9
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+38.4

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/.../..     40 W   AERO 44 MPH WNW RMY 46
4/2  40/27/34/-7/T/T/.../..          45 W   AERO 42 MPH W   RMY 47
4/3  45/27/36/-6/0.00/0.0/.../..     44 W   AERO 43 MPH W   RMY 47
4/4  55/26/41/-1/0.00/0.0/.../..     30 WSW AERO 27 MPH WSW RMY 31
4/5  59/36/48/+5/0.00/0.0/.../..     33 NNW AERO 28 MPH NNW RMY 38

4/6  morning low temp: 30F; the normal low is now 34F

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 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940

RECORDS FOR APRIL 7
HIGH 90 IN 2010
LOW 13 IN 1982
PRECIP 1.72 IN. IN 1924
SNOWFALL 4.5 IN. IN 1967, 1996
PEAK GUST 65 MPH WNW IN 1982

TODAY'S REPORT PREPARED BY: Mike Iacono