BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 27, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Obscured by heavy fog and light rain
Temperature: 55F, Dew point: 55F, Wind: ESE at 20G24 kt
Sea-level pressure: 29.91 inches Hg, falling
Visibility: 1/4 of a mile
6-hour minimum temp: 50F
24-hour precipitation: 0.16 inches
BHO SA 1155 W2 X1 1/4R-F 128/55/55/1220G24/991/ STRA DFTG OVR SMT/ 
8//// 58020 6/// 70016 10055 20050
 
10 A.M.
Weather: Obscured by fog and light drizzle
Temperature: 60F, Dew point: 60F, Wind: SE at 17G24 kt
Sea-level pressure: 29.85 inches Hg, falling
Visibility: Variable; 3/4 of a mile prevailing
3-hour precipitation: 0.02 inches
BHO SA 1455 W2 X1 3/4L-F 107/60/60/1317G24/985/ STRA DFTG OVR SMT 
VSBY SW 2 NE 1/4 PK WND 1326/1418/ 8//// 58021 6002/
 
1 P.M. 
Weather: Overcast stratus and light drizzle
Temperature: 62F, Dew point: 62F, Wind: ESE at 19G27 kt
Sea-level pressure: 29.73 inches Hg, falling
Visibility: 8 miles
6-hourly max. temp: 62F 
6-hourly precipitation: 0.08 inches
BHO SA 1755 5 OVC 8L- 067/62/62/1219G27/973/ STRA DFTG OVR SMT 
PK WND 1228/1735/ 8/6// 58040 6008/ 10062 20055
 
 
WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 26
 
TEMPERATURE (DEGREES F)
MAX.....62    NORMAL.....68
MIN.....43    NORMAL.....50
MEAN....53    NORMAL.....59
 
DEPARTURE FROM 30-YEAR AVERAGE...........-6
TOTAL DEPARTURE FOR THE MONTH...........-16 [-0.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............12  DEPARTURE.......+5
TOTAL HEATING UNITS FOR THE MONTH............96  DEPARTURE......-11
TOTAL HEATING UNITS FOR THE SEASON..........130  DEPARTURE.......-8
TOTAL HEATING UNITS LAST SEASON TO DATE.....111  DIFFERENCE.....+19
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............24 S   AT  5:46 P.M.
                   AEROVANE..............21 S   AT  5:46 P.M.
                   ASOS..................23 SSW AT  5:47 P.M.
                   DAVIS.................22 S   AT  5:46 P.M.
FASTEST MILE FOR YESTERDAY...............17 S   AT  6:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............17 S   AT  6:32 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........14 S   AT  3:30 P.M.   
AVERAGE WIND SPEED AND DIRECTION........8.7 NE
                   ASOS.................8.9
                   DAVIS................7.7 ESE [124 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16   DEPARTURE....+0.02
                         ASOS..............0.17
TOTAL PRECIPITATION FOR MONTH..............2.45   DEPARTURE....-1.12
                         ASOS..............2.50
TOTAL PRECIPITATION FOR THE YEAR..........37.22   DEPARTURE....+0.18
                         ASOS.............38.42
 
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
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/.../..     33 NW
9/26 62/43/53/-6//.../..      24 S
 
NEW DAILY RECORDS FOR SEPTEMBER 2009 TO DATE...
None.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 27
HIGH 84F IN 1998
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
 
RECORDS FOR SEPTEMBER 28
HIGH 82F IN 1959
LOW 33F IN 1897,1947
PRECIP 1.53 INCHES IN 1956
PEAK GUST 69 MPH NE IN 1962
 
TODAY'S REPORT PREPARED BY: Andrew Hoell