BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 2, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNNY START TO OCTOBER WITH NEAR NORMAL TEMPS.
 
After a near record sunny September, October began 
on the sunny side with 84% of possible sunshine on 
the first day. Temperatures averaged near normal 
and the long established dry weather pattern
continued.
 
HIGHLIGHTS FOR SEPTEMBER
 
AUGUST-SEPTEMBER 2007 RANKED 2ND SUNNIEST 
SEPTEMBER 2007 RANKED 3RD SUNNIEST ON RECORD 
THE AVERAGE MAX. TEMP. WAS 2ND WARMEST ON RECORD
AUGUST-SEPTEMBER RANKED 3RD DRIEST WITH 2.52 INCHES
 
SEPTEMBER 2007 DATA 
Degrees F/inches of rainfall
 
Av. Max. 75.7 
Av. Min. 55.7
Mean 65.7 [+3.6]
24-hr. mean 64.5
Heating units: 63 [-75] 
Cooling units: 91 [+42] 
Max. temp: 93/8th
Min. temp: 45/16th
Total precip: 1.89 ins. [-2.24]
Max. in 24 hours: 1.34 ins. [11th] 
Sunshine:  265.9 hours [uncorrected] 3rd lowest on record. 
and 276.7 hours [corrected] both at 74%
of possible 
Av. vapor pressure: 14.4 mbs.[only slightly below normal]  
Av. wind speed [corrected] 11.6 MPH [5th lowest on record] 
Prevailing wind: SSW @ 14%
Peak gust: 36 MPH WNW on 15th [lowest on record checked back to 1965]
 
SOME NOTABLE SEPTEMBER RANKINGS
 
Although the month averaged tied for 9th warmest September 
the average maximum temperature was 2nd warmest on record.  
However, the average minimum temperature ranked only 15th 
warmest at 55.7
 
2ND WARMEST SEPT. AVERAGE MAXIMUM TEMPERATURES [DEG F] 
 
1.  76.6 IN 1930
2.  75.7 IN 2007
3.  75.6 IN 1959 
4.  75.5 IN 1961
 
SECOND SUNNIEST AUGUST-SEPTEMBER ON RECORD
1. 553.0 hours in 1941
2. 536.0 hours in 2007
3. 520.2 hours in 1932
 
Although the total September precipitation of 1.89 inches ranked
only 32nd driest, the August-September precipitation total at 2.52 ins.
ranked 3rd driest.
1.  1.84 in. 1948
2.  2.40 in. 1959
3.  2.52 in. 2007
 
Total bright sunshine was 265.9 hours and ranked the month 3rd 
sunniest September on record. 
1.  267.7 hours in 1983
2.  266.9 hours in 1941
3.  265.9 hours in 2007 
4.  255.3 hours in 1948
 
Today's observations:
 
7 A.M.   
Weather: Scattered stratocumulus clouds & increasing, broken cirrus,
many patches of thin and dense ground fog below inversion ESE-S-WSW   
Temperature: 55F, Dew point: 51F, Wind: SE at 04 kts
Sea-level pressure: 30.45 inches Hg, steady
Visibility: 20 miles  
6-hour min temp: 50F
BHO SA 1155 18 SCT 250 BKN 20 311/55/51/1304/045/ SC LYR FRMG/
INCRSNG FEW CC XTENSVE PTCHS THN/DENSE GF BLO INVSN ESE-S-WSW 
PTCH DENSE STEAM FG OVR POND 11/2 SE THN F ALQDS/ 
8/501 51008 10055 20050 
 
10 A.M.   
Weather: Broken stratocumulus and cirrocumulus, cirrus, 
Temperature: 63F, Dew point: 53F, Wind: S at 06 kts
Wind: light/variable  
Sea-level pressure: 30.45 inches Hg, steady
Visibility: 35 miles 
BHO SA 1455 E22 BKN 220 BKN 35 311/63/53/1906/045/ 
LWR CU FRMG CC/CI LGT HZ WND L/V/ 8/809 50000
 
1 P.M.     
Weather: Overcast variable broken stratocumulus, moderate cuform tops 
Temperature: 70F, Dew point: 55F, Wind: SSE at 08 kts 
Wind: Variability ESE-S
Sea-level pressure: 30.40 inches Hg, falling
Visibility: 40 miles, 50 miles, 35 miles  
6-hour max. temp.: 70F 
BHO SA 1755 E30V OVC 40 293/70/55/1608/040/ OVC V BKN
MDT CU TOPS NMRS BINOVC HIER CI VSB NE VSBY W-NW 50 
NE 35 WND 12V19/ 8/501 58019 10070 20055
 

WEATHER SUMMARY FOR MONDAY, OCTOBER 1 
 
TEMPERATURE (DEGREES F)
MAX.....67    NORMAL.....66 
MIN.....49    NORMAL.....48
MEAN....58    NORMAL.....57
DEPARTURE FROM 30-YEAR NORMAL.........+1 
TOTAL DEPARTURE FOR THE MONTH.........+1  
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............18 S   AT 11:30 P.M. *    
                   AEROVANE.............. 18 SSE AT  7:44 P.M.     
                   ASOS...................17 S   AT 11:27 P.M.   
                   DAVIS..................20 SE  AT  8:02 P.M.     
FASTEST MILE FOR YESTERDAY................        
MAXIMUM 2-MINUTE ASOS AVERAGE.............14 S   AT  11:47 P.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE............15 SE  AT   7:57 P.M. .     
AVERAGE WIND SPEED AND DIRECTION..........  
                   ASOS................... 8.5   
                   DAVIS.................. 9.1 SE [140 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 THE MONTH..........1.89  DEPARTURE.....-2.38  
                         ASOS..............1.89    
TOTAL PRECIPITATION FOR THE YEAR..........32.88  DEPARTURE.....-4.86
                         ASOS.............32.12    
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER-OCTOBER 2007...CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
9/1  79/57/68/+1/0/790/100    25 WNW   
9/2  78/51/65/-1/0/787/100    22 S   
9/3  85/57/71/+5/0/760/97     31 SSW AERO 28 MPH SSW 
9/4  76/61/69/+3/0/641/82     28 NW  AERO 26 MPH NW
9/5  74/53/64/-1/0/732/94     21 ESE 
9/6  76/55/66/+1/0/380/49     31 S
9/7  92/62/77/+12/0/680/88    30 SSW
9/8  93/67/80/+15/0/686/89    31 S    TSTM 
9/9  72/57/65/+1/0.16/000/00  28 NNE  TSTM 
9/10 66/57/62/-2/0.03/000/00  18 NNE
9/11 68/58/63/-1/1.34/000/00  30 WNW  
9/12 73/55/64/+1/0/752/99     35 W    Aero 33 MPH W
9/13 73/52/63/0/0/741/98      23 ESE  
9/14 76/56/66/+3/0/587/78     26 SSE
9/15 63/49/56/-6/0.33/225/30  36 WNW  
9/16 65/45/55/-7/0/606/81     20 WNW  
9/17 63/46/55/-7/0/738/99     20 NE  
9/18 64/46/55/-6/0/720/97     22 NE    
9/19 69/48/59/-2/0/414/56     18 S 
9/20 81/53/67/+6/0/597/81     18 SSW
9/21 77/60/69/+9/0/653/89     20 N
9/22 79/60/70/+10/0/417/57    27 S
9/23 77/59/68/+8/0/713/98     25 WNW
9/24 80/55/68/+9/0/703/97     24 WNW 
9/25 86/57/72/+13/0/701/97    27 SSW
9/26 91/67/79/+20/0/641/89    32 S    Aero 32 MPH S 
9/27 83/65/74/+16/0.02/445/62 30 SSW  Aero 29 MPH SSW  
9/28 77/57/67/+9/0.01/428/60  25 WSW
9/29 72/55/64/+6/0/640/90     30 NW
9/30 63/50/57/0/0/425/60      23 NNW 
 
10/1 67/49/58/+1/0/592/84     18 S
 
10/2 morning low temp. 50F; normal low now 47F
 
NEW DAILY RECORDS FOR SEPTEMBER 2007: 
 
9/7 -  RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945.
9/8 -  RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945.
9/26 - RECORD HIGH TEMPERATURE 91; PREVIOUS 87 IN 1958.
       EQUALED HIGH MINIMUM TEMPERATURE OF 67; ALSO IN 1920. 
     - LATEST 90-DEG. TEMPERATURES; PREVIOUS RECORD WAS 
       93 DEG. ON SEPT. 23, 1895 AND 1914. 
9/27 - RECORD HIGH MINIMUM TEMPERATURE OF 65; PREVIOUS 63 IN 1930.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW  29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984
 
RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW  28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964
 
TODAY'S REPORT PREPARED By: Robert Skilling