BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 22, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Scattered altocumulus, overcast cirrostratus
Temperature: 51F, Dew point: 49F, Wind: S at 9 kts
Sea-level pressure: 30.03 inches Hg, falling
Visibility: 8 miles, thin fog
6-hour minimum temp: 50F
BHO SA 1155 110 SCT E220 OVC 8 170/51/49/1909/003/ THN FG/
8/037 56007 10055 20050
 
10 A.M.
Weather: Scattered altocumulus, overcast cirrostratus
Temperature: 58F, Dew point: 51F, Wind: SSW at 6 kts
Sea-level pressure: 29.97 inches Hg, falling
Visibility: 8 miles, hazy
BHO SA 1455 120 SCT E220 OVC 8 150/58/51/2006/997/ HAZY/
8/037 58020
 
1 P.M.   
Weather: Clear, few altocumulus lenticularis all quadrants,
few cirrus, dark smoke layer NNW-NE
Temperature: 73F, Dew point: 48F, Wind: SSW at 11G18 kts
Sea-level pressure: 29.89 inches Hg, falling
Visibility: 15 miles, 6 miles NE, 30 miles W-NW
6-hour maximum temp: 73F, hazy
BHO SA 1755 CLR 15 123/73/48/2011G18/989/ FEW AC/ACSL ALQDS 
FEW CI DRK K LYR NNW-NE HAZY VSBY NE 6 W-NW 30/ 8/041 56027 
10073 20051

 
WEATHER SUMMARY FOR WEDNESDAY, OCTOBER 21
 
TEMPERATURE (DEGREES F)
MAX.....68     NORMAL.....58
MIN.....48     NORMAL.....41
MEAN....58     NORMAL.....50
 
DEPARTURE FROM 30-YEAR AVERAGE...........+8
TOTAL DEPARTURE FOR THE MONTH...........-81 [-4.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............7  DEPARTURE.......-8
TOTAL HEATING UNITS FOR THE MONTH...........328  DEPARTURE......+76
TOTAL HEATING UNITS FOR THE SEASON..........485  DEPARTURE......+64
TOTAL HEATING UNITS LAST SEASON TO DATE.....351  DIFFERENCE....+134
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............19 W   AT   3:43 A.M. * 
                   AEROVANE..............16 W   AT  12:55 A.M.    
                   ASOS..................16 WNW AT   3:45 A.M.    
                   DAVIS.................18 W   AT  12:27 A.M.  
FASTEST MILE FOR YESTERDAY...............13 WSW AT  11:55 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............13 WSW AT  11:55 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........13 W   AT  12:55 A.M.  
AVERAGE WIND SPEED AND DIRECTION........7.7 W
                   ASOS.................7.7
                   DAVIS................7.9 W [264 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 MONTH..............4.53   DEPARTURE....+1.59
                         ASOS..............4.50
TOTAL PRECIPITATION FOR THE YEAR..........42.41   DEPARTURE....+1.87
                         ASOS.............43.56
 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
 
10/1  56/39/48/-9/0/155/22     27 WSW 
10/2  60/40/50/-6/0/442/63     23 SSE 
10/3  63/51/57/+1/1.10/000/00  32 ESE  AERO 30 MPH ESE 
10/4  67/57/62/+6/0/202/29     21 WSW
10/5  64/49/57/+2/0/595/86     33 W    AERO 31 MPH W
10/6  65/45/55/0/0/628/91      25 W
10/7  67/51/59/+4/0.70/344/50  54 W    AERO 54 MPH W
10/8  61/48/55/+1/0/602/88     43 W    AERO 39 MPH W
10/9  60/48/54/0/0.05/000/00   29 SSE
10/10 62/42/52/-2/0.26/205/30  37 NW
10/11 61/39/50/-3/0/655/97     35 WSW  AERO 33 MPH W 
10/12 53/36/45/-8/T/471/70     23 SSW
10/13 51/36/44/-8/0.20/074/11  35 WNW 
10/14 52/32/42/-10/0/494/74    27 NW
10/15 41/32/37/-15/0.19/000/00 29 NNE
10/16 41/33/37/-14/0.24/000/00 37 NNE  AERO 35 MPH NNE T SNOW
10/17 48/33/41/-10/0/250/38    35 NNE
10/18 46/32/39/-12/1.79/000/00 43 NNE  SNOWFALL 3.0 INS
10/19 52/33/43/-8/0/.../..     25 NNW
10/20 65/38/55/+2/0/.../..     23 W
10/21 68/48/58/+8/0/.../..     19 W
 
10/22 our morning low temp: 50F; the normal low is now 41F
 
NEW DAILY RECORDS FOR OCTOBER 2009
10/7: NEW RECORD WIND GUST 54 MPH W AT 2005E;
      surpasses previous record of 52 MPH ESE in 1972
10/15: NEW RECORD LOW MAXIMUM TEMPERATURE 41;
      surpasses previous 47 set in 1887 and 1896
10/16: NEW RECORD LOW MAXIMUM TEMPERATURE 41;
      surpasses previous 42 set in 1940
10/18: NEW RECORD DAILY SNOWFALL 3.0 INS; 
      surpasses previous trace in 1972
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 22
HIGH 85 IN 1979
LOW 22 IN 1940
PRECIP 1.37 INCHES IN 1898
SNOWFALL TRACE IN 1969
PEAK GUST 67 MPH ESE IN 1988
 
RECORDS FOR OCTOBER 23
HIGH 82 IN 1947
LOW 24 IN 1969
PRECIP 2.18 INCHES IN 1956
SNOWFALL 3.0 INCHES IN 1891
PEAK GUST 78e MPH NW IN 1941
 
TODAY'S REPORT PREPARED BY: Stephanie Radner