BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 30, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
COOLER TEMPS, FOG, AND RAIN/DRIZZLE PERSIST...
 
Another cool, foggy, and rainy day at summit as a cutoff low still
lingers offshore. Temperatures have been in the low 50's for the third
straight day associated with this system. The sun has been absent once
again keeping temperatures fairly steady. Winds have been calm today
as well. Only 0.01 inch of rain fell overnight but as another round of
showers passed through today, an additional 0.21 inch was measured by
2:00 EDT. Visibility at its highest today was about 15 miles, but did
not last for too long, as more fog has settled in.
 
As September comes to an end, Blue Hill will finish just about average
temperature-wise, and slightly below normal for precipitation. As we all
are well aware of, wind speed is below average as well. From atop the
summit, foliage once again seems to be a little behind this year, but
is more than last year at this time.
 
Today's observations:
 
7 A.M.
Weather: Sky obscured in light drizzle and dense fog
Temperature: 53F; Dew Point: 52F; Wind: NNW at 8 kts
Sea-level pressure: 29.85 ins. Hg, steady
Visibility: 3/4 mile, ESE-W 1 1/2 miles, WNW-E 1/8 mile, light drizzle
and fog
6-hour precip: 0.01 inch
24-hour precip: TBD
6-hour min. temp: 52F
BHO SA 1155 W2 X 3/4L-F 107/53/52/3308/985/ VSBY HIER ESE-W 1 1/2 VSBY
LWR WNW-E 1/8 L-CTD/ 8//// 54000 ASOS 60001 MANUAL 60001 ASOS 70003
MANUAL 70002 10053 20052
 
10 A.M. 
Weather: Sky obscured in light rain and dense fog
Temperature: 53F; Dew Point: 53F; Wind: N at 7 kts,
Sea-level pressure: 29.81 ins. Hg, decreasing
Visibility: 1/2 mile, S-SSW 1 1/2 miles, SW-E 1/8 mile ESE-SSE 1 mile
3-hour precip: 0.19 inch
BHO SA 1455 W2 X 1/2R-F 095/53/53/3507/981/ VSBY HIER S-SSW 1 1/2
ESE-SSE 1 VSBY LWR SW-E 1/8 R-CTD/ 8//// 58012 ASOS 60019 MANUAL 60019
 
1 P.M. 
Weather: Overcast stratus and thin fog, stratus fractus drifting below
summit all quadrants
Temperature: 55F; Dew Point: 55F; Wind: Calm
Sea-level pressure: 29.77 ins. Hg, decreasing
Visibility: 15 miles, N 9 miles
6-hour precip: 0.21 inch
6-hour max. temp: 55F
6-hour min. temp: 53F
BHO SA 1755 E5 OVC 15 081/55/55/E0000/977/ STFRA DRFTG BLO SMT ALQDS
VSBY LWR N 9 WND CALM/ 8/7// 56014 ASOS 60020 MANUAL 60021 10055 20053
 
 
WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 29
 
TEMPERATURE (DEGREES F)
MAX.....56    NORMAL.....67
MIN.....51    NORMAL.....49
MEAN....54    NORMAL.....58
 
DEPARTURE FROM 30-YEAR NORMAL.....................-4
TOTAL DEPARTURE FOR THE MONTH....................+13 [+0.2 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............11    DEPARTURE........+3
TOTAL HEATING UNITS FOR THE MONTH............88    DEPARTURE.......-21
TOTAL HEATING UNITS FOR THE SEASON...........88    DEPARTURE.......-46
TOTAL HEATING UNITS LAST SEASON TO DATE......75    DIFFERENCE......+13
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............28 NNE AT  12:40 A.M.
                   AERO..................25 NNE AT  12:34 A.M.
                   ASOS..................26 NNE AT  12:40 A.M.
                   DAVIS.................25 N   AT  12:39 A.M. RMY N/A
THE FASTEST MILE FOR YESTERDAY...........19 NNE AT  12:35 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............20 NNE AT  12:29 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 NNE AT  12:28 A.M.
AVERAGE WIND SPEED AND DIRECTION........7.1 N
                   ASOS.................6.2
                   DAVIS................7.1 N [010 deg]
* Last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01   DEPARTURE...........-0.14
                         ASOS..............0.02
TOTAL PRECIPITATION FOR THE MONTH..........3.05   DEPARTURE...........-1.01
                         ASOS..............3.08
TOTAL PRECIPITATION FOR THE YEAR..........28.40   DEPARTURE..........-10.68
                         ASOS.............28.34
 
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/+6/0.00/706/94         25 S   AERO 23 MPH S   RMY 23
9/15 72/54/63/-1/0.07/441/59         28 NW  AERO 27 MPH WNW RMY 27
9/16 70/49/60/-3/0.00/731/98         23 W   AERO 20 MPH W   RMY 21
9/17 74/51/63/0/0.00/698/94          20 S   AERO 17 MPH S   RMY N/A
9/18 74/58/66/+4/0.13/044/06         60 S   AERO 62 MPH S   RMY 63
9/19 70/53/62/0/0.90/472/64          55 S   AERO 56 MPH S   RMY N/A
9/20 63/50/57/-5/0.00/539/87         24 NE  AERO 21 MPH NE  RMY 21
9/21 63/48/56/-5/0.01/241/33         18 E   AERO 16 MPH E   RMY 16
9/22 70/55/63/+2/0.04/306/42         28 S   AERO 25 MPH S   RMY 27
9/23 69/50/60/0/0.02/653/90          27 WNW AERO 24 MPH WNW RMY 27
9/24 66/45/56/-4/0.00/694/96         23 WSW AERO 21 MPH WSW RMY 22
9/25 72/48/60/0/0.00/691/96          35 SSW AERP 35 MPH SW  RMY 36
9/26 70/57/64/+5/T/050/07            31 S   AERO 32 MPH S   RMY 32
9/27 70/53/62/+3/0.00/.../..         24 NNW AERO 23 MPH NNW RMY 23
9/28 56/53/55/-3/.../.../..          29 ESE AERO 29 MPH ESE RMY 30
9/29 56/51/54/-4/.../.../..          28 NNE AERO 25 MPH NNE RMY N/A
 
9/30 morning low temp: 52F; the normal low is now 49F
 
DAILY RECORDS FOR SEPTEMBER 2012
9/19 - NEW RECORD PEAK WIND GUST OF 55 MPH S;
       surpasses previous record of 49 MPH NE IN 1972
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 30
HIGH 84F IN 1986
LOW 31F IN 1992
PRECIP 1.93 INCHES IN 1946
PEAK GUST 58 MPH SSE IN 1999
 
RECORDS FOR OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.44 INCHES IN 1984
PEAK GUST 68e MPH SSE IN 1977
 
TODAY'S REPORT PREPARED BY: George Tabeek/Peter Volpe