BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 4, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Sky obscured, dense fog
Temperature: 58F, Dew point: 58F, Wind: NNW at 8 kts
Sea-level pressure: 29.90 inches Hg, rising
Visibility: 1/4 of mile
6-hour minimum temp: 58F
24-hour precipitation: 0.97 inches
BHO SA 1155 W2 X1 1/4F 124/58/58/3408/990/ WND VEERING/
8//// 53008 6//// 70097 10061 20058
 
10 A.M.
Weather: Low overcast stratus
Temperature: 61F, Dew point: 61F, Wind: WNW at 4 kts
Wind: Light and variable
Sea-level pressure: 29.89 inches Hg, falling
Visibility: 3 miles, fog
BHO SA 1455 E5 OVC 3F 121/61/61/3004/989/
WND L/V/ 8/6// 58003
 
 
WEATHER SUMMARY FOR SATURDAY, OCTOBER 3
 
TEMPERATURE (DEGREES F)
MAX.....63    NORMAL.....65
MIN.....51    NORMAL.....47
MEAN....57    NORMAL.....56
 
DEPARTURE FROM 30-YEAR AVERAGE............+1
TOTAL DEPARTURE FOR THE MONTH............-14 [-4.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............8  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE MONTH............40  DEPARTURE......+13
TOTAL HEATING UNITS FOR THE SEASON..........197  DEPARTURE.......+1
TOTAL HEATING UNITS LAST SEASON TO DATE.....140  DIFFERENCE.....+57
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............32 ESE AT 8:17 A.M.
                   AEROVANE..............30 ESE AT 8:18 A.M.
                   ASOS..................29 ESE AT 3:59 P.M. 
                   DAVIS.................30 ESE AT 8:16 A.M.  
FASTEST MILE FOR YESTERDAY...............26 ESE AT 8:11 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............22 SE  AT 8:18 A.M.     
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 ESE AT 8:17 A.M.      
AVERAGE WIND SPEED AND DIRECTION.......15.5 ESE
                   ASOS................13.7
                   DAVIS...............14.7 ESE [121 DEG]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.97   DEPARTURE....+0.83
                         ASOS..............0.98
TOTAL PRECIPITATION FOR MONTH..............1.10   DEPARTURE....+0.68
                         ASOS..............1.10
TOTAL PRECIPITATION FOR THE YEAR..........38.98   DEPARTURE....+0.96
                         ASOS.............40.16
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
9/1  71/51/61/-6/0/773/98     17 NW
9/2  76/54/65/-1/0/786/100    22 S
9/3  77/56/67/+1/0/587/75     19 SW
9/4  77/60/69/+3/0/764/98     18 NE
9/5  81/59/70/+5/0/591/76     25 NNW
9/6  64/53/59/-6/0/743/96     31 NNE
9/7  70/52/61/-4/0/709/92     20 WSW
9/8  75/56/66/+1/0/369/48     18 WSW  
9/9  68/55/62/-2/0/352/46     36 NNE  AERO 33 MPH NNE
9/10 65/53/59/-5/0/603/79     31 ENE
9/11 61/54/58/-6/0.49/000/00  30 NE
9/12 63/60/62/-1/1.74/000/00  30 NNE  TSTM 
9/13 76/58/67/+4/0.06/393/52  28 NW 
9/14 74/55/65/+2/0/699/93     22 WSW
9/15 75/56/66/+4/0/682/91     22 WNW
9/16 61/53/57/-5/T/060/08     31 NNE  AERO 29 MPH NNE
9/17 60/49/55/-7/0/022/03     27 N   
9/18 71/47/59/-2/T/571/77     35 WSW  AERO 30 MPH WSW
9/19 65/45/55/-6/0/716/97     30 NW   AERO 28 MPH WNW
9/20 71/45/58/-3/0/721/98     22 SW  
9/21 76/50/63/+3/0/703/96     20 S
9/22 74/55/65/+5/0/124/17     27 SSW
9/23 78/61/70/+10/0/145/20    35 SSW
9/24 77/57/67/+8/0/348/48     25 SW
9/25 63/50/57/-2/0/671/93     33 NW
9/26 62/43/53/-6/0/689/96     24 S
9/27 65/49/57/-1/0.32/000/00  32 SE   AERO 31 MPH SE
9/28 73/55/64/+6/0.38/619/87  43 W    AERO 39 MPH W; DAVIS 45 MPH WSW TSTM 
9/29 67/54/61/+3/0.12/533/75  35 S    AERO 35 MPH S
9/30 60/42/51/-6/0/049/07     27 WSW
 
10/1 56/39/48/-9/0/.../..     27 WSW  AERO 23 MPH WSW
10/2 60/40/50/-6/0/.../..     23 SSE 
10/3 63/51/57/+1/.../.../..   32 ESE
 
NEW DAILY RECORDS FOR OCTOBER 2009
None.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.07 INCHES IN 1986
PEAK GUST 59 MPH SSW IN 1990
 
RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979
 
TODAY'S REPORT PREPARED BY: Andrew Hoell