BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 16, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
BEAUTIFUL AUTUMN-LIKE DAY ON SUMMIT AS TEMPS NEAR 70 BY EARLY AFTERNOON
OVERNIGHT TEMPERATURE DROPS BELOW 50 F
 
The sun was back out today as the air felt very autumn-like with cooler
temperatures and low humidity. Our overnight low temperature of 49F marks
the second time this month where temperatures have fell below 50F. This
morning there was not a single cloud in sight but as the day progressed
diurnal cumulus clouds began developing and passing through. Excellent
visibility has accompanied this drier air mass today, seeing as far out
as 70 miles at least. Winds have been out of the northwest and have
picked up at times, with a current gust of 22 mph.
 
 
Today's observations:
 
7 A.M.
Weather: Clear sky, very light distant haze all quadrants, shallow inversion
present, patchy dew on grass surfaces
Temperature: 52F; Dew Point: 47F; Wind: WNW at 8 kts
Sea-level pressure: 30.09 ins. Hg, increasing steadily  
Visibility: 70 miles, very light distant haze
6-hour min. temp: 49F
24-hour precip: 0.07 inch
BHO SA 1155 SKC 70 191/52/47/2908/009/ VRY LGT DSNT HZ ALQDS SHLW INVSN PRSNT
PTCHY DEW GRASS SFCS/ 8/000 52014 ASOS 70007 MANUAL 70007 10052 20049
 
10 A.M.
Weather: Scattered cumulus, few cumulus fractus all quadrants, few moderate cumulus
all quadrants, light distant haze
Temperature: 63F; Dew Point: 48F; Wind: W at 12 kts,
Wind: Direction variable SW-NW
Sea-level pressure: 30.08 ins. Hg, decreasing
Visibility: 70 miles, light distant haze
BHO SA 1455 35 SCT 185/63/48/2712/008/ FEW CUFRA ALQDS FEW MDT CU ALQDS LGT DSNT HZ
WND 23V31/ 8/100 58006
 
1 P.M. 
Weather: Scattered cumulus, scattered cirrus, few cumulus/cumulus fractus all
quadrants, few cirrus SW-NNW, light distant haze
Temperature: 68F; Dew Point: 45F; Wind: W at 10 kts,
Wind: Direction variable SW-NNW
Sea-level pressure: 30.04 ins. Hg, decreasing 
Visibility: 75 miles, light distant haze
6-hour max. temp: 69F
BHO SA 1755 40 SCT 200 SCT 172/68/45/2610/004/ FEW CU/CUFRA ALQDS FEW CI SW-NNW LGT
DSNT HZ WND 22V34/ 8/101 58013 10069 20052
 
 
WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 15
 
TEMPERATURE (DEGREES F)
MAX.....72    NORMAL.....72
MIN.....54    NORMAL.....55
MEAN....63    NORMAL.....64
 
DEPARTURE FROM 30-YEAR NORMAL.....................-1
TOTAL DEPARTURE FOR THE MONTH....................+23 [+1.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............2    DEPARTURE........-1
TOTAL HEATING UNITS FOR THE MONTH............15    DEPARTURE.......-16
TOTAL HEATING UNITS FOR THE SEASON...........15    DEPARTURE.......-41
TOTAL HEATING UNITS LAST SEASON TO DATE......26    DIFFERENCE......-11
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............28 NW  AT  2:34 P.M. 
                   AERO..................27 WNW AT  3:42 P.M.  
                   ASOS..................25 NW  AT  3:46 P.M.  
                   DAVIS.................27 NW  AT  3:46 P.M. RMY 27 
THE FASTEST MILE FOR YESTERDAY...........19 WNW AT  3:49 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............18 NW  AT  3:47 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 NW  AT  3:43 P.M.  
AVERAGE WIND SPEED AND DIRECTION.......11.5 WNW
                   ASOS................11.5
                   DAVIS...............10.6 W [280 deg]
* Last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07   DEPARTURE...........-0.06
                         ASOS..............0.07
TOTAL PRECIPITATION FOR THE MONTH..........1.18   DEPARTURE...........-0.70
                         ASOS..............1.16
TOTAL PRECIPITATION FOR THE YEAR..........26.53   DEPARTURE..........-10.37
                         ASOS.............26.42
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2012 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
 
9/1  75/60/68/0/0.00/637/81          27 ENE AERO 25 MPH ENE RMY 23
9/2  80/60/70/+2/0.00/455/58         21 ENE AERO 20 MPH ENE RMY 20
9/3  76/57/67/0/0.00/485/62          20 SE  AERO 20 MPH S   RMY 21
9/4  72/62/67/0/0.40/000/00          25 S   AERO 23 MPH S   RMY N/A
9/5  79/64/72/+5/0.31/171/22         33 SSW AERO 35 MPH SSW RMY 33
9/6  77/62/70/+3/0.00/279/36         20 SSW AERO 20 MPH SSW RMY 19
9/7  85/66/76/+10/0.00/463/60        22 SSW AERO 20 MPH SSW RMY N/A TSTM
9/8  81/62/72/+6/0.38/453/59         45 S   AERO 45 MPH S   RMY 45   
9/9  72/58/65/-1/0.02/283/37         25 WNW AERO 23 MPH WNW RMY N/A
9/10 66/50/58/-7/0.00/313/41         33 NW  AERO 32 MPH NW  RMY 34
9/11 71/47/59/-6/0.00/714/94         23 NW  AERO 21 MPH WNW RMY N/A
9/12 77/53/65/0/0.00/719/95          20 S   AERO 18 MPH S   RMY 18
9/13 81/59/70/+6/0.00/731/97         21 S   AERO 18 MPH S   RMY 19
9/14 81/59/70/+6/0.00/.../..         25 S   AERO 23 MPH S   RMY 23
9/15 72/54/63/-1/0.07/.../..         28 NW  AERO 27 MPH WNW RMY 27
 
9/16 morning low temp: 49F; the normal low is now 55F
 
DAILY RECORDS FOR SEPTEMBER 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999
 
RECORDS FOR SEPTEMBER 17
HIGH 86F IN 1915,1941,1991
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
 
TODAY'S REPORT PREPARED BY: George Tabeek