BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 21, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
TEMPERATURES FALL AFTER UNSEASONABLY WARM SUNDAY
EARLY THIS AFTERNOON TEMPS. 23 DEGREES COLDER
NOVEMBER AVERAGE IS WELL OVER 5 DEGREES ABOVE NORMAL
 
Temperatures began falling rather sharply after 2 A.M.
this morning when we reached our high for today of
55 degrees.  Yesterday's high and low of 64 and 47
degrees averaged 16 degrees warmer than normal at
56 degrees.  The day was the 8th day this month to
have double-digit positive temperature departures.
 
During recent days the coldest airmass in North America
has been about stationary over Alaska and the Yukon
where temperatures have remained -20 to -50F.
 
 
WARMEST MEAN NOVEMBER MAX TEMPS ON RECORD FOR BHO:
1)  55.8F 1975
2)  54.9F 1927
3)  54.8F 2001
4)  54.6F 2006,1941,1931
7)  54.5F 1994,1948
9)  54.0F 1979
10) 53.9F 1999,1953
 
The current average maximum temperature for November is 57.3F
 
WARMEST MEAN NOVEMBER MIN TEMPS ON RECORD FOR BHO:
1)  40.7F 2009,2006      
3)  40.2F 1948       
4)  40.1F 1975       
5)  39.3F 1979
6)  38.4F 1931
7)  38.0F 1953
8)  37.9F 1963
9)  37.8F 2001
10) 37.6F 1999
     
The current average minimum temperature for November is 41.0F
 
WARMEST NOVEMBERS ON RECORD FOR BHO:
1)  47.7F 2006
2)  47.4F 1975
3)  46.8F 2009
4)  46.4F 1948,1979
6)  46.3F 2001
7)  45.7F 1999,1953
9)  45.6F 1931
10) 45.8F 1999,1994
 
The current average temperature for November is 48.1F
 
 
Today's observations:
 
7 A.M. 
Weather: Scattered altostratus, overcast dense cirrostratus,
few stratocumulus distant ENE-ESE, altostratus SE-SW,
virga south, thin spots/small breaks in overcast W-NNE 
Temperature: 44F, Dew point: 35F; Wind: N at 11 kts
Sea-level pressure: 30.24 inches Hg, rising 
Visibility: 55 miles, light distant haze 
24-hour precip: 0.00 inch
6-hour min. temp: 44F
BHO SA 1155 160 SCT E200 OVC 55 239/44/35/3611/024/ FEW SC DSNT 
ENE-ESE AC N-E-SW AS/VIRGA SE-SW CLR SKY BND XTDNG NW-NNE SML 
BINOVC W-NNE LGT DSNT HZ/ 8/577 530027 10055 20044   
 
10 A.M.
Weather: Broken stratocumulus, broken altocumulus, broken cirrus,
mostly clear sky SW-W, altocumulus distant S-SW, virga SW-W,
few cirrus
Temperature: 44F, Dew Point: 31F; Wind: N at 8 kts
Sea-level pressure: 30.31 inches Hg, rising
Visibility: 65 miles, NW 75 miles 
BHO SA 1455 E35 BKN 100 BKN 250 BKN 65 265/44/31/3508/031/
MSTLY CLR SKY SW-W AC DSNT S-SW VIRGA SW-W VSBY NW 75/
8/541 53026
 
1 P.M. 
Weather: Broken stratocumulus, few lower cumulus
Temperature: 41F, Dew Point: 31F; Wind: ENE  at 9 kts,
Wind: Direction variable NE-E
Sea-level pressure: 30.29 inches Hg, falling
Visibility: 60 miles, 70 miles NW, light distant haze   
6-hour max. temp: 46F
BHO SA 1755 E34 BKN 60 258/41/31/0709/029/ FEW LWR CU
VSBY NW 70 LGT DSNT HZ GST TO 19 KTS PST HR WND 04V10/
8/800 58007 10046 20041
 
WEATHER SUMMARY FOR SUNDAY, NOVEMBER 20
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....48
MIN.....47    NORMAL.....33
MEAN....56    NORMAL.....40
 
DEPARTURE FROM 30-YEAR NORMAL.....................+16
TOTAL DEPARTURE FOR THE MONTH....................+116 [+5.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..............9   DEPARTURE........-16
TOTAL HEATING UNITS FOR THE MONTH............313   DEPARTURE.......-118
TOTAL HEATING UNITS FOR THE SEASON...........739   DEPARTURE.......-283
TOTAL HEATING UNITS LAST SEASON TO DATE......893   DIFFERENCE......-154
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............39 SW  AT  2:29 A.M. 
                   AERO...................40 SW  AT  2:29 A.M.
                   ASOS...................40 SW  AT  2:30 A.M.
                   DAVIS..................40 SSW AT  2:29 A.M.
THE FASTEST MILE FOR YESTERDAY............32 SW  AT  2:37 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.............32 SW  AT  2:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............31 SSW AT  2:31 A.M.
AVERAGE WIND SPEED AND DIRECTION........18.0 SW
                   ASOS.................17.8
                   DAVIS................16.7 SSW [210 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE..........-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH  ........2.12  DEPARTURE..........-1.00
                         ASOS..............2.05
TOTAL PRECIPITATION FOR THE YEAR..........56.14  DEPARTURE.........+11.00
                        ASOS..............56.50**
**ASOS data is in error due to system failure on 1/12-13/11
 
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.........-1.7
TOTAL SNOWFALL FOR THE SEASON...............8.5  DEPARTURE.........+6.6
 
PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2011 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
RMY:  R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
11/1  50/38/44/-3/0.00/0.0/286/46   25 ENE AERO 24 MPH ENE RMY 24
11/2  54/34/44/-2/0.00/0.0/619/100  17 S   AERO 16 MPH S   RMY N/A
11/3  60/40/50/+4/0.00/0.0/437/71   27 WSW AERO 30 MPH WSW RMY 28
11/4  49/33/41/-5/0.00/0.0/343/56   33 NW  AERO 35 MPH NNW RMY 36
11/5  47/29/38/-7/0.00/0.0/556/91   18 NW  AERO 21 MPH NNW RMY 21
11/6  56/35/46/+1/0.00/0.0/603/99   24 SSW AERO 24 MPH SSW RMY 26
11/7  62/39/51/+6/0.00/0.0/600/99   23 WSW AERO 24 MPH SW  RMY 25
11/8  68/49/59/+15/0.00/0.0/580/96  20 W   AERO 21 MPH W   RMY N/A
11/9  68/50/59/+15/0.00/0.0/584/97  22 S   AERO 23 MPH S   RMY 23
11/10 60/53/57/+13/1.12/0.0/000/00  22 WNW AERO 22 MPH WNW RMY N/A
11/11 55/37/46/+3/T/0.0/358/60      41 W   AERO 44 MPH W   RMY 45
11/12 52/34/43/0/0.00/0.0/524/88    35 SSW AERO 38 MPH SSW RMY 38
11/13 62/43/53/+10/0.00/0.0/243/41  36 S   AERO 37 MPH S   RMY 38
11/14 67/52/60/+18/T/0.0/372/63     33 SSW AERO 35 MPH SSW RMY N/A
11/15 66/55/61/+19/T/0.0/053/09     37 SSW AERO 38 MPH SSW RMY 38
11/16 58/52/55/+13/0.84/0.0/000/00  18 S   AERO 21 MPH S   RMY 21
11/17 53/34/44/+3/0.16/0.0/006/01   31 WNW AERO 31 MPH WNW RMY 32
11/18 43/31/37/-4/0.00/0.0/576/99   32 W   AERO 33 MPH W   RMY 32
11/19 52/34/43/+2/0.00/0.0/347/60   39 SW  AERO 40 MPH SW  RMY 42
11/20 64/47/56/+16/0.00/0.0/451/78  39 SW  AERO 40 MPH SW  RMY 42
 
11/21 our morning low temp: 44F; the normal low is now 33F
 
DAILY RECORDS FOR NOVEMBER 2011
None so far...
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 2.60 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989
 
RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 12 IN 1987
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945
 
TODAY'S REPORT PREPARED BY: Robert Skilling/Patrick Peters