BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 26, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
BRIGHT SUNSHINE AND SPECTACULAR VISIBILITY TODAY
UP TO 90 MILES AS TEMPERATURES NEAR 60F
 
High thin clouds have slowly been invading the sky
from the south and southwest but bright sunshine has
prevailed today.  Visibility is about as good as it gets
and we're reporting a view of 90 miles.  Mt. Washington
was reporting their maximum visibility today with 120 to
130 miles. Temperatures will average only very slightly
above the normal here today after the past 6 days averaged
5 degrees on the warm side.
 
Today's observations:
 
7 A.M.
Weather: Clear, cirrus filosus radiatus east-southeast thru southwest
Temperature: 41F, Dew point: 35F, Wind: WNW at 10 kts
Sea-level pressure: 30.30 inches Hg, rising
Visibility: 80 miles, patches thin valley fog
vicinity station southwest and west-northwest thru northwest
6-hour minimum temp: 40F
24-hour precipitation: 0.00 inches
BHO SA 1155 CLR 80 260/41/35/3010/030/ CI ESE-SW PTCHS SHLW GF ALG 
RIVER VLY SW AND WNW-NW/ 8/001 53021 10043 20040
 
10 A.M.
Weather: Clear, cirrus filosus radiatus east-southeast
through southwest 
Temperature: 51F, Dew point: 31F, Wind: NW at 12 kts
Wind: Direction variability W to N 
Sea-level pressure: 30.33 inches Hg, falling
Visibility: 90 miles
BHO SA 1455 CLR 90 272/51/31/3112/033/ CI ESE-SW WND 28V36/ 8/001 
50012
 
1 P.M.
Weather: Thin scattered cirrus, thin broken cirrus, clear sky
northwest thru northeast 
Temperature: 58F, Dew point: 30F, Wind: NW at 8 kts.
Wind: Direction variable W to NNW 
Sea-level pressure: 30.31 inches Hg, falling
Visibility: 90 miles
6-hour maximum temp: 58F 
BHO SA 1755 250 –SCT 300 –BKN 90 263/58/30/3108/031/
CLR SKY NW-NW WND 28V34/ 8/006 56009 10058 20041
 
WEATHER SUMMARY FOR SUNDAY, OCTOBER 25
 
TEMPERATURE (DEGREES F)
MAX.....64     NORMAL.....57
MIN.....44     NORMAL.....40
MEAN....54     NORMAL.....49
 
DEPARTURE FROM 30-YEAR AVERAGE...........+5
TOTAL DEPARTURE FOR THE MONTH...........-59 [-2.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............11  DEPARTURE.......-6
TOTAL HEATING UNITS FOR THE MONTH...........369  DEPARTURE......+52
TOTAL HEATING UNITS FOR THE SEASON..........526  DEPARTURE......+40
TOTAL HEATING UNITS LAST SEASON TO DATE.....429  DIFFERENCE.....+97
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 W   AT  3.38 A.M.
                   AEROVANE..............35 W   AT  3:23 A.M.
                   ASOS..................32 W   AT  3:38 A.M. 
                   DAVIS.................33 W   AT  3:-- A.M. 
FASTEST MILE FOR YESTERDAY...............22 WNW AT  3:37 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............22 WNW AT  3:39 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........25 WNW AT  3:-- A.M. 
AVERAGE WIND SPEED AND DIRECTION.......14.0 W
                   ASOS................13.1
                   DAVIS...............14.5 W [265 DEG]
 
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 MONTH..............6.17   DEPARTURE....+2.65
                         ASOS..............6.18
TOTAL PRECIPITATION FOR THE YEAR..........44.05   DEPARTURE....+2.93
                         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
10/25 64/44/54/+5/.../.../..   35 W    AERO 35 MPH W
 
10/26 our morning low temp: 40F; the normal low is 40F
 
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 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
 
RECORDS FOR OCTOBER 27
HIGH 83 IN 1963
LOW 21 IN 1936
PRE 1.79 INCHES IN 1886
SNOW 0.1 INCHES IN 1957
WIND 54 MPH WNW IN 1968
 
TODAY'S REPORT PREPARED BY: Robert Skilling