BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 9, 2009  
ALL DATA IN EASTERN STANDARD TIME
 
TEMPERATURES RISE TO UPPER 60'S BY EARLY AFTERNOON 
BEAUTIFUL SUNNY AND MILD NOVEMBER WEATHER CONTINUES
30-DEGREE TEMPERATURE DIFFERENCE DURING EARLY
MORNING HOURS OF TODAY 
 
This is our second consecutive very sunny, mild
November day. Temperatures have reached 68F by early
afternoon not far from today's record of 72.  An
overnight temperature inversion developed last night
into early this morning.  By 3 a.m. the difference
was 29 degrees between the nearby low elevation Norwood
Airport and here at the summit of Blue Hill.  The
thermometer stood at 58F here just before 3 a.m.
while the airport was down to 29F degrees!  The over-
night lows were 26F at Norwood and 49F here at the
summit of Great Blue Hill.   
 
Today's observations:
 
7 A.M.
Weather: Clear, SKC, perfectly clear
Temperature: 50F, Dew point: 29F, Wind: SSE at 14 kts
Sea-level pressure: 30.42 inches Hg, rising
Visibility: 50 miles, few patches thin fog below
inversion south thru west 
6-hour minimum temp: 49F
BHO SA 1155 CLR 50 301/50/29/1614/042/
FEW PTCHS THN FG BLO INVSN S-W/ 52007 10058 10049
 
10 A.M.
Weather: Clear, few small altocumulus to the distant south,
few cirrus distant northwest  
Temperature: 61F, Dew point: 39F, Wind: S at 17G23 kts,
Wind: Direction variability SSE to SSW
Sea-level pressure: 30.41 inches Hg, falling
Visibility: 35 miles, except 45 miles west-northwest,
hazy, haze increasing
BHO SA 1455 CLR 35 299/61/39/1917G23/041/
FEW SML AC DSNT S FEW CI DSNT NW VSBY WNW 45
HAZY HZ INCRSNG WND 15V21 8/041 58002
 
1 P.M. 
Weather: Thin scattered cirrus, few small altocumulus distant
SW-W, lower dense cirrus west thru north
Temperature: 68F, Dew point: 36F, Wind: S at 15G24 kts,
Wind: Direction variable SE-SW
Sea-level pressure: 30.30 inches Hg, falling
Visibility: 45 miles, distant haze  
6-hourly max. temp: 68F 
BHO SA 1755 300 –SCT 45 262/68/36/1715G24/030/
FEW SML AC DSNT SW-W LWR DENS CI DSNT W-N HAZY WND 14V22/
8/042 58037 10068 20050
 
WEATHER SUMMARY FOR SUNDAY, NOVEMBER 8
 
TEMPERATURE (DEGREES F)
MAX.....66     NORMAL.....52
MIN.....42     NORMAL.....37
MEAN....54     NORMAL.....44
 
DEPARTURE FROM 30-YEAR AVERAGE...........+10
TOTAL DEPARTURE FOR THE MONTH............- 5 [-0.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............11    DEPARTURE.......-10
TOTAL HEATING UNITS FOR THE MONTH...........161    DEPARTURE........+4
TOTAL HEATING UNITS FOR THE SEASON..........782    DEPARTURE.......+34
TOTAL HEATING UNITS LAST SEASON TO DATE.....658    DIFFERENCE.....+124
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............31 SSW AT   2:01 A.M. 
                   AEROVANE..............28 SSW AT   2:01 A.M.
                   ASOS..................30 SSW AT   2:01 A.M.
                   DAVIS.................32 SSW AT   2:01 A.M.
FASTEST MILE FOR YESTERDAY...............23 S   AT  12:47 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............23 S   AT   3:35 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 S   AT  12:34 A.M.
AVERAGE WIND SPEED AND DIRECTION.......11.6 W
                   ASOS................11.5
                   DAVIS...............11.7 WSW [250 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH  ............0.06   DEPARTURE....-1.14
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE YEAR..........45.17   DEPARTURE....+1.95
                         ASOS.............46.35
                 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.....-0.5
TOTAL SNOWFALL FOR THE SEASON...............3.0  DEPARTURE.....+2.3
                                               
PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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
 
11/1  58/44/51/+4/0.05/.../.. 22 WNW  
11/2  49/42/46/0/T/.../..     29 NE
11/3  57/36/47/+1/0/.../..    32 W    AERO 32 MPH W    
11/4  49/34/42/-4/0/.../..    24 W
11/5  46/36/41/-4/0.01/.../.. 21 N
11/6  47/31/39/-6/0/.../..    38 WNW  AERO 38 MPH WNW
11/7  49/29/39/-6/0/..../..   33 S
11/8  66/42/54/+10/0/.../..   31 SSW
 
11/9  our morning low temp: 49F; the normal low is now 36F
 
NEW DAILY RECORD FOR NOVEMBER 2009
None      
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR NOVEMBER 9
HIGH 72 IN 1975
LOW 17 IN 1971
PRECIP 1.37 INCHES IN 1969
SNOWFALL 0.2 IN 1921,1923
PEAK GUST 73e S IN 1943
 
RECORDS FOR NOVEMBER 10
HIGH 75 IN 1931
LOW 20 IN 2004
PRECIP 2.11 INCHES IN 1888
SNOWFALL 2.2 IN 1987
PEAK GUST 83e S IN 1942
 
TODAY'S REPORT PREPARED BY: Robert Skilling