BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 25, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Scattered altocumulus, scattered cirrus
Temperature: 49F, Dew point: 43F, Wind: W at 14G21 kt
Sea-level pressure: 29.90 inches Hg, rising
Visibility: 65 miles
6-hour minimum temp: 49F
24-hour precipitation: 1.54 inches
BHO SA 1155 150 SCT 200 SCT 250 SCT 65 125/49/43/2814G21/990/
8/051 53038 70154 10063 20049
 
10 A.M.
Weather: Clear; few altocumulus SE,
few stratocumulus forming distant W
Temperature: 55F, Dew point: 41F, Wind: WNW at 16G22 kt
Sea-level pressure: 29.96 inches Hg, rising
Visibility: 70 miles
BHO SA 1455 CLR 70 147/55/41/2916G22/996/
FEW AC SE FEW SC FRMG DSNT W/ 8/450 51022
 
WEATHER SUMMARY FOR SATURDAY, OCTOBER 24
 
TEMPERATURE (DEGREES F)
MAX.....67     NORMAL.....57
MIN.....42     NORMAL.....40
MEAN....55     NORMAL.....49
 
DEPARTURE FROM 30-YEAR AVERAGE...........+6
TOTAL DEPARTURE FOR THE MONTH...........-64 [-2.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............10  DEPARTURE.......-6
TOTAL HEATING UNITS FOR THE MONTH...........358  DEPARTURE......+58
TOTAL HEATING UNITS FOR THE SEASON..........515  DEPARTURE......+46
TOTAL HEATING UNITS LAST SEASON TO DATE.....419  DIFFERENCE.....+96
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............53 S AT  1:37 P.M.
                   AEROVANE..............51 S AT  1:50 P.M.
                   ASOS..................52 S AT  1:38 P.M.
                   DAVIS.................50 S AT  2:17 P.M.
FASTEST MILE FOR YESTERDAY...............40 S AT  2:21 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............37 S AT  2:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........35 S AT 10:36 P.M.
AVERAGE WIND SPEED AND DIRECTION.......19.5 S
                   ASOS................17.9
                   DAVIS...............17.0 SSE [154 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.54   DEPARTURE....+1.39
                         ASOS..............1.58
TOTAL PRECIPITATION FOR MONTH..............6.17   DEPARTURE....+2.80
                         ASOS..............6.18
TOTAL PRECIPITATION FOR THE YEAR..........44.05   DEPARTURE....+3.08
                         ASOS.............45.24
 
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 65/38/52/+2/0/.../..     23 W    *
10/21 68/48/58/+8/0/.../..     19 W
10/22 74/50/62/+12/0/.../..    30 S
10/23 57/38/48/-1/0/.../..     35 NW   AERO 32 MPH NW
10/24 67/42/55/+6/.../.../..   53 S    AERO 51 MPH S
 
* Mean temperature for the 20th corrected from 55 to 52.
 
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
10/16: NEW RECORD DAILY SNOWFALL TRACE; 
      surpasses previous zero for the date
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 25
HIGH 81 IN 1963
LOW 26 IN 1922,1939
PRECIP 2.45 INCHES IN 2005
SNOWFALL 1.2 INCHES IN 1960
PEAK GUST 72 MPH ESE IN 1980
 
RECORDS FOR OCTOBER 26
HIGH 80 IN 1963
LOW 24 IN 1933
PRECIP 1.72 INCHES IN 1894
SNOW 3.0 INCHES IN 1962
WIND 59 MPH SSE IN 1967
 
TODAY'S REPORT PREPARED BY: Andrew Hoell