BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 30, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM NOVEMBER TO SET RECORDS
SUNSHINE BELOW AVERAGE BY TEN POINTS
 
Unusually warm minimum temperatures will be
the reason that this month will rank among
our warmest Novembers.  Only two days,
both during the first week, had low readings
below the freezing mark which may be a new
record. There was really only one night
during the whole month on November 6-7 which
had freezing temperatures. The low temp-
erature of 29F recorded during the morning
of November 7th will surpass the previous
record of 28 degrees was set in November 1998.
The average monthly minimum temperature of
41.0 degrees would set a new high mark sur-
passing the 40.7 in 2006. 
There was 100% of the possible sunshine
yesterday which pulled the monthly percent
up a few points to 40%  This came after five
consecutive overcast days last week.
 
Today's observations:
 
7 A.M.
Weather: Overcast altocumulus, few altocumulus castellanus southeast, 
patches of virga SW-N, higher clouds visible SE-S, breaks in overcast
east thru south 
Temperature: 49F, Dew point: 46F, Wind: S at 15 kts
Sea-level pressure: 29.60 inches Hg, falling
Visibility: 20 miles, 25 miles WNW, thin fog, hazy 
6-hour minimum temp: 46F
24-hour precipitation: 0.00
BHO SA 1155 E100 OVC 20 022/49/46/1715/960/ FEW ACC SE-S HIER CLD VSB SE-S
BINOVC E-S PTCHS VIRGA SW-N THN FGHZ DEW HARD SFCS/ 8/081 58011 10049 20046
 
10 A.M.
Weather: Overcast altocumulus with few bright spots in the overcast 
Temperature: 52F, Dew point: 44F, Wind: SSW at 13 kts
Sea-level pressure: 29.60 inches Hg, rising
Visibility: 25 miles, hazy
BHO SA 1455 E65 OVC 25 024/52/44/2013/960/ FEW BRGHT SPTS IOVC HAZY/ 
8/07/ 53002 
 
1 P.M.
Weather: Broken stratocumulus, overcast nimbostratus, light rain  
Temperature: 50F, Dew point: 45F, Wind: WSW at 17G25 kts,
Wind: Peak wind gust 26 kts from WSW at 12:37 p.m.,
Wind: Direction variable SSW-W, gradually veering
Sea-level pressure: 29.57 inches Hg, falling
Visibility: 8 miles, light rain, but 5 miles west thru north,
25 miles southeast, lowering all quadrants
6-hour maximum temp: 53F
6-hour precip: 0.01 in. 
BHO SA 1755 E30 BKN 65 OVC 8R- 012/50/45/2517G25/957/
VSBY LWRG ALQDS W-N 5 SE 25 WND 2426/37/ WND 21V27
GRDLY VEERING/ 8/52/ 56012 ASOS 60001 MANUAL 6001/ 10053 20049
 
WEATHER SUMMARY FOR SUNDAY, NOVEMBER 29
 
TEMPERATURE (DEGREES F)
MAX.....52     NORMAL.....44
MIN.....37     NORMAL.....30
MEAN....45     NORMAL.....37
 
DEPARTURE FROM 30-YEAR AVERAGE.............+8
TOTAL DEPARTURE FOR THE MONTH............+149 [+4.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............20    DEPARTURE........-8
TOTAL HEATING UNITS FOR THE MONTH...........519    DEPARTURE......-151
TOTAL HEATING UNITS FOR THE SEASON.........1140    DEPARTURE......-121
TOTAL HEATING UNITS LAST SEASON TO DATE....1221    DIFFERENCE......-81
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............27 WSW AT  4:06 A.M. *
                   AEROVANE..............25 WSW AT  4:03 A.M.
                   ASOS..................25 WSW AT  4:06 A.M.
                   DAVIS................ 28 WSW AT  4:02 A.M. 
THE FASTEST MILE FOR YESTERDAY...........20 WSW AT  4:42 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............20 WSW AT  4:04 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 SSW AT  1:24 P.M.  
AVERAGE WIND SPEED AND DIRECTION.........13.4 WSW 
                   ASOS................  13.4
                   DAVIS...............  12.2 SW [220 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 THE MONTH..........4.22   DEPARTURE....-0.27
                         ASOS..............4.22
TOTAL PRECIPITATION FOR THE YEAR..........49.33   DEPARTURE....+2.82
                         ASOS.............50.53
                 
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.....-2.6
TOTAL SNOWFALL FOR THE SEASON...............3.0  DEPARTURE.....+0.2
                                               
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/+4/0.05/167/27   22 WNW  
11/2  49/42/46/0/T/099/16       29 NE
11/3  57/36/47/+1/0/474/77      32 W    AERO 32 MPH W    
11/4  49/34/42/-4/0/514/84      24 W
11/5  46/36/41/-4/0.01/006/01   21 N
11/6  47/31/39/-6/0/419/69      38 WNW  AERO 38 MPH WNW
11/7  49/29/39/-6/0/575/95      33 S
11/8  66/42/54/+10/0/549/91     31 SSW
11/9  68/49/59/+15/0/486/81     35 S    AERO 35 MPH S
11/10 62/50/56/+12/0/000/00     23 SW 
11/11 50/43/47/+4/0/113/19      31 NNE
11/12 49/41/45/+2/0/125/21      34 NE   AERO 31 MPH NNE
11/13 49/44/47/+4/0/000/00      39 NNE  AERO 37 MPH NNE
11/14 59/49/54/+12/2.08/000/00  39 NE   AERO 38 MPH NE
11/15 60/52/56/+14/0.06/012/02  18 W
11/16 56/43/50/+8/0/527/90      30 NW   AERO 31 MPH NW
11/17 47/35/41/0/0/576/99       28 WNW
11/18 49/34/42/+1/0/313/54      15 SSW
11/19 59/41/50/+9/0/226/39      30 SE
11/20 65/44/55/+15/0.57/219/38  40 W    AERO 41 MPH W
11/21 55/41/48/+8/0/373/65      25 SW 
11/22 49/38/44/+4/0/292/51      28 ENE 
11/23 47/42/45/+6/0.22/000/00   33 NE   AERO 31 MPH ENE
11/24 46/44/45/+6/0.11/000/00   33 NE   AERO 30 MPH NE
11/25 47/43/45/+6/.../000/00    21 N
11/26 50/44/47/+9/.../000/00    22 N
11/27 44/39/42/+4/.../000/00    48 W    AERO 48 MPH W
11/28 49/38/44/+7/.../191/34    55 WNW  AERO 54 MPH W
11/29 52/37/45/+8/0/561/100     27 WSW
 
11/30 our morning low temp: 45F since midnight and 43F overnight;
the normal low is now 29F
 
NEW DAILY RECORD FOR NOVEMBER 2009
11/14: NEW RECORD DAILY RAINFALL 2.08 INCHES;
      surpasses previous 1.87 inches in 1972.  
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR NOVEMBER 30
HIGH 67 IN 2006
LOW 7 IN 1887, 1929
PRECIP 2.42 INCHES IN 1944
SNOWFALL 10.2 INS IN 1945
PEAK GUST 90 SSW IN 1963
 
RECORDS FOR DECEMBER 1
HIGH 70 IN 2001
LOW 3 IN 1887
PRECIP 1.46 INS. IN 1917
SNOW 2.0 INS. IN 1902
PEAK GUST 72 MPH NW IN 1964
 
TODAY'S REPORT PREPARED BY: Robert Skilling