BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 22, 2010
ALL TIMES ARE IN EASTERN STANDARD TIME
 
STRONG HIGH PRESSURE SYSTEM BRINGS COLDEST
HIGH TEMPERATURE (37F) SINCE 33F ON MARCH 4TH
HIGHEST BAROMETER SINCE MARCH 2009
 
The highest barometer reading (~30.58 inches) since
March, 2009, occurred late yesterday afternoon.
The lowest maximum temperature of 37F since March 4
occurred yesterday afternoon during the passage
of a large high pressure system.
 
A strong high pressure system moved into the region
late Saturday night bringing unseasonably cold Canadian air to
the summit. After reaching 51F on Saturday, temperatures
dipped into the upper 20s early Sunday morning. 
 
Today's observations: 
 
7 A.M.
Weather: Broken stratocumulus, overcast stratocumulus,
Temperature: 36F, Dew point: 31F; Wind: ESE at 13 kts,
Sea-level pressure: 30.43 inches Hg, falling 
Visibility: 30 miles
6-hour minimum temp: 32F
BHO SA 1155 E27 BKN 40 OVC 30 304/36/31/1213/043/
CIG LWR DRK STRA LYR DSNT SW-NW FEW THN SPTS
SML BINOVC OVHD-E-SE FEW HIER CI CLDS VSBY NE 40
LGT HZ ALQDS/ 8/501 58018 10036 20032 
 
10 A.M.
Weather: Overcast stratocumulus, few lower stratocumulus 
Temperature: 43F, Dew point: 38F; Wind: SSE at 14 kts,
Wind: Direction variable NW to ENE
Sea-level pressure: 30.37 inches Hg, falling 
Visibility: 30 miles
BHO SA 1455 E38 OVC 30 284/43/38/1514/037/ FEW LWR SC
FEW BRGHT SPTS SML BINOVC OVHD LGT HZ/ WND 13V18
8/5// 58020 
 
1 P.M.
Weather: Overcast stratus fractus, stratus, few lower fractus,
ceiling ragged
Temperature: 48F, Dew point: 45F; Wind: S at 15G23 kts,
Sea-level pressure: 30.26 inches Hg, falling
Visibility: 15 miles  
6-hour max. temp: 48F
BHO SA 1755 8 SCT E18 BKN 30 OVC 15 246/48/45/1715G23/026/
CIG RGD VSBY WNW 20 THN FGHZ/ 8/6// 58038 10048 20036
 
WEATHER SUMMARY FOR SUNDAY, NOVEMBER 21
 
TEMPERATURE (DEGREES F)
MAX.....37     NORMAL.....47
MIN.....29     NORMAL.....33
MEAN....33     NORMAL.....40
 
DEPARTURE FROM 30-YEAR NORMAL.................-7
TOTAL DEPARTURE FOR THE MONTH.................+7 [+0.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............32    DEPARTURE........+7
TOTAL HEATING UNITS FOR THE MONTH...........448    DEPARTURE........-8
TOTAL HEATING UNITS FOR THE SEASON..........925    DEPARTURE......-122
TOTAL HEATING UNITS LAST SEASON TO DATE.....977    DIFFERENCE......-52
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............22 NW  AT  4:10 A.M.  
                   AEROVANE..............23 NW  AT  4:10 A.M. 
                   ASOS..................22 NW  AT  4:10 A.M.         
                   DAVIS.................24 NW  AT  4:11 A.M.        
THE FASTEST MILE FOR YESTERDAY...........16 NW  AT  4:04 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............16 WNW AT  4:11 A.M.         
MAXIMUM 2-MINUTE DAVIS AVERAGE...........17 WNW AT  2:01 A.M.    
AVERAGE WIND SPEED AND DIRECTION.........9.9 NE
                   ASOS..................9.7         
                   DAVIS.................9.7 NNE [020 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..........4.18  DEPARTURE........+0.90
                         ASOS..............4.23
TOTAL PRECIPITATION FOR THE YEAR..........57.90  DEPARTURE.......+12.60
                         ASOS.............57.78**
** ASOS missing rainfall due to system failure on 6/24-25
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.1
TOTAL SNOWFALL FOR THE MONTH................0.1  DEPARTURE.....-1.7
TOTAL SNOWFALL FOR THE SEASON...............0.1  DEPARTURE.....-1.9 
 
PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2010 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
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
11/1  49/29/39/-8/0.00/446/72      24 WNW
11/2  46/33/40/-6/0.00/271/44      21 NW
11/3  50/28/39/-7/0.00/264/43      20 SSE
11/4  54/37/46/0/0.91/000/00       43 NNE  AERO 45 MPH NE
11/5  59/44/52/+7/0.51/000/00      36 S    AERO 39 MPH S
11/6  48/38/43/-2/000/0.0/134/22   20 N
11/7  42/33/38/-7/0.17/T/012/02    32 NW
11/8  47/32/40/-4/1.17/0.1/000/00  60 N    AERO 60 MPH N
11/9  50/42/46/+2/0.21/0.0/006/01  32 N    AERO 35 MPH N
11/10 45/39/42/-2/0.17/0.0/006/01  38 N    AERO 42 MPH N
11/11 45/37/41/-2/0.00/0.0/411/69  43 NNE  AERO 43 MPH NNE
11/12 53/35/44/+1/0.00/0.0/594/100 23 N  
11/13 61/42/52/+9/0.00/0.0/592/100 20 N 
11/14 50/41/46/+4/0.00/0.0/153/26  25 NNE
11/15 52/44/48/+6/0.00/0.0/.../..  15 SE 
11/16 54/46/50/+8/.../0.0/.../..   20 E
11/17 62/46/54/+13/.../0.0/.../..  45 WSW  AERO 48 MPH WSW
11/18 52/37/45/+4/0.00/0.0/.../..  51 W    AERO 55 MPH W
11/19 43/32/38/-3/0.00/0.0/.../..  26 W
11/20 51/31/41/+1/0.00/0.0/.../..  40 W    AERO 44 MPH W
11/21 37/29/33/-7/0.00/0.0/.../..  22 NW 
 
11/22 our morning low temp: 31F; the normal low is now 32F
 
NEW DAILY RECORDS FOR NOVEMBER 2010
None so far
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
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
 
RECORDS FOR NOVEMBER 23
HIGH 73 IN 1931
LOW 9 IN 1888
PRECIP 2.33 INS IN 2006
SNOWFALL 5.5 INS IN 1989
PEAK GUST 64e S IN 1953
 
TODAY'S REPORT PREPARED BY: Robert Skilling