BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 24, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME

2ND WARMEST HIGH TEMPERATURE OF THE MONTH

Yesterday's high temperature of 78F is the second
warmest temperature for the month.  The high for 
the month of 81F occurred on the 5th.
 
Today's observations:

7 A.M.   
Weather: Broken stratocumulus, broken altocumulus
Temperature: 70F, Dew point: 68F, Wind: W at 6 kts
Sea-level pressure: 29.98 inches Hg, rising
Visibility: 8 miles, thin fog
6-hour minimum temp: 68F
24-hour precipitation: 0.00
BHO SA 1155 E35 BKN 120 BKN 8 153/70/68/2606/998/ 
THN FG/ 8/530 52013 10070 20068

10 A.M. 
Weather: Broken stratocumulus, few moderate cumulus
Temperature: 75F, Dew point: 64F, Wind: WNW at 7 kts,
Wind: Direction variable SW to N
Sea-level pressure: 29.98 inches Hg, falling
Visibility: 15 miles, hazy
BHO SA 1455 E30 BKN 15 151/75/64/2907/998/ 
FEW MDT CU FRMG WND 22V35 HAZY/ 8/200 50002

1 P.M.  
Weather: Broken stratocumulus, overcast stratocumulus,
small breaks in overcast
Temperature: 75F, Dew point: 62F, Wind: WSW at 8 kts
Sea-level pressure: 29.96 inches Hg, falling 
Visibility: 35 miles, light haze 
6-hourly max. temp: 77F  
BHO SA 1755 E45 BKN 55 OVC 35 144/75/62/3008/996/ 
SML BRKS IOVC LGT HZ/ 8/5// 58007 10077 20070

WEATHER SUMMARY FOR WEDNESDAY, SEPTEMBER 23

TEMPERATURE (DEGREES F)
MAX.....78    NORMAL.....69
MIN.....61    NORMAL.....51
MEAN....70    NORMAL.....60

DEPARTURE FROM 30-YEAR AVERAGE..........+10
TOTAL DEPARTURE FOR THE MONTH...........-16 [-0.9 DEGREES/DAY] 

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0  DEPARTURE.......-6
TOTAL HEATING UNITS FOR THE MONTH............76  DEPARTURE......-10
TOTAL HEATING UNITS FOR THE SEASON..........110  DEPARTURE.......-7
TOTAL HEATING UNITS LAST SEASON TO DATE......91  DIFFERENCE.....+19

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 SSW AT  2:26 P.M. *
                   AEROVANE..............32 SSW AT  1:54 P.M.   
                   ASOS..................33 SW  AT  2:27 P.M.     
                   DAVIS.................37 S   AT  2:26 P.M.    
FASTEST MILE FOR YESTERDAY...............25 SSW AT  1:54 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............24 SW  AT  2:27 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........27 SSW AT  1:02 P.M.    
AVERAGE WIND SPEED AND DIRECTION.......15.9 SSW
                   ASOS................15.7
                   DAVIS...............16.1 SSW [206 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00   DEPARTURE....-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH..............2.29   DEPARTURE....-0.86
                         ASOS..............2.33
TOTAL PRECIPITATION FOR THE YEAR..........37.06   DEPARTURE....+0.44
                         ASOS.............38.25

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/+10/145/20      35 SSW

9/24 our morning low temp: 68F; the normal low is now 50F

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 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

RECORDS FOR SEPTEMBER 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991

TODAY'S REPORT PREPARED BY: Stephanie Radner