BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, NOVEMBER 1, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WIND GUSTS FROM SOUTH HIT OVER 50 MPH
ON OCTOBER 31ST TEMPS. REACH 71F
RAINFALL TOTALS ONLY 0.12 INCH
LATE SATURDAY INTO EARLY SUNDAY
 
Each of our wind recording systems registered
peak gusts over 50 MPH yesterday ranging
between 54 and 59 MPH.  Hourly average
speeds ranged between 31 and 34 MPH between
noon and 5:00 P.M. EDT with the fastest average
of 34 MPH between 3 and 4 P.M. EDT
The temperature reached a high of 71F just
before 2 p.m. EDT. Rainfall during the evening
and early hours of today totaled only 0.12 inch.  
 
OCTOBER WAS ALMOST 2 DEGREES COOLER
AND NEAR 3 INCHES WETTER THAN AVERAGE
 
OCTOBER 2009 MONTHLY STATS
Temps. Deg. F
Av. Max. 57.9
Av. Min. 41.7
Mean     49.8 [-1.8]
Mean     49.5 (24 hour corrected) 
Max.     74 [22nd]
Min.     32 [18th+][14th,15th]
First freeze of season 32 on 14th
Average date is 20th  October
Heating degree day units total: 464 [+42]
Heating degree day units seasonal total: 621 [+30]
Cooling degree day units total: zero [- 3]
Cooling degree day units seasonal total: 464 [-94]
Total precipitation: 7.23 inches [+2.81 ins.}
Greatest in 24 hours: 1.79 inches on 18th
Total snowfall: 3.0 inches [+2.9 ins]
Av. wind speed: 12.4 MPH (uncorrected)
Av. wind speed (corrected) 12.8 MPH
Prevailing wind direction: W 18%
Peak wind gust: 54 MPH S on 31st
Other gusts:    59 MPH S Davis
                58 MPH S Aerovane
                56 MPH S Merlin  
                55 MPH S ASOS 
Fastest mile:   45 MPH S on 31st
Max. 2-min avs: 41 MPH S ASOS
                43 MPH S Davis   
Sunshine data:  not available at this time  
 
Today's observations:
 
7 A.M.
Weather: Overcast, As, few altocumulus, few stratus
fractus dissipated, light rain ended 6:50 a.m.
Temperature: 48F, Dew point: 43F, Wind: W at 10 kts
Sea-level pressure: 30.02 inches Hg, rising
Visibility: 35 miles 
6-hour minimum temp: 47F
6-hourly precipitation: 0.05 in. 
24-hourly precipitation: 0.12 in.
BHO SA 1155 E120 OVC 35 166/48/43/2710/002/ FEW STFRA DSSPTG PST 
HR FEW LWR AC BRGHT SPTS IOVC E-S AND SML BINOVC ESE BINOVC DSNT 
W-NW/CLRG SKY BND RE50/ 8/07/ 51030 ASOS 60003 MANUAL 6005/
ASOS 70010 MANUAL 70012 10053 20047
 
10 A.M.
Weather: Broken dense cirrus, cirrocumulus, few stratocumulus
to the distant west thru north, few altocumulus northeast
through south, snow virga northeast thru south, large
area clearing sky west thru north and the sun is
dimly visible
Temperature: 51F, Dew point: 41F, Wind: WNW at 11 kts,
Sea-level pressure: 30.06 inches Hg, rising
Visibility: 80 miles
3-hourly rainfall: trace
BHO SA 1455 200 SCT E220 BKN 250 BKN 80 181/51/41/2911/006/
FEW SC DSNT W-N FEW AC NE-S DENS CI/CC SNW VIRGA E-S CLRG SKY 
W-N/ 8/542 51015 MANUAL 6000/ 
 
WEATHER SUMMARY FOR SATURDAY, OCTOBER 31
 
TEMPERATURE (DEGREES F)
MAX.....71     NORMAL.....55
MIN.....44     NORMAL.....39
MEAN....58     NORMAL.....47
 
DEPARTURE FROM 30-YEAR AVERAGE......... +11
TOTAL DEPARTURE FOR THE MONTH...........-49 [-1.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............7  DEPARTURE......-11
TOTAL HEATING UNITS FOR THE MONTH...........464  DEPARTURE......+42
TOTAL HEATING UNITS FOR THE SEASON..........621  DEPARTURE......+30
TOTAL HEATING UNITS LAST SEASON TO DATE.....542  DIFFERENCE.....+79
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............54 S   AT  3:54 P.M.
                   ASOS..................55 S   AT  3:55 P.M.
                   AEROVANE..............58 S   AT  3:54 P.M. *  
                   ASOS..................22 S   AT  5:53 P.M.
                   DAVIS.................59 S   AT  3:54 P.M. 
FASTEST MILE FOR YESTERDAY............... 
MAXIMUM 2-MINUTE ASOS AVERAGE............41 S   AT  2:30 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........43 S   AT  2:30 P.M.
AVERAGE WIND SPEED AND DIRECTION.......24.5 S
                   ASOS................22.8
                   DAVIS...............22.7 S [190 DEG]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.12   DEPARTURE....-0.03
                         ASOS..............0.10
TOTAL PRECIPITATION FOR OCTOBER............7.23   DEPARTURE....+2.81
                   ASOS OCTOBER............7.25
TOTAL PRECIPITATION FOR THE YEAR..........45.11*  DEPARTURE....+3.09*  
                    ASOS..................46.31*
* totals and departure thru October
 
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/-8/0/628/96     25 NNW
10/20 65/38/52/+2/0/566/87     23 W    
10/21 68/48/58/+8/0/363/56     19 W
10/22 74/50/62/+12/0/265/41    30 S
10/23 57/38/48/-1/T/000/00     35 NW   AERO 32 MPH NW
10/24 67/42/55/+6/1.58/000/00  53 S    AERO 51 MPH S
10/25 64/44/54/+5/0.06/.../..  35 W    AERO 35 MPH W
10/26 59/40/50/+2/0/.../..     27 NW
10/27 50/43/47/-1/0.01/000/00  24 NNE
10/28 50/46/48/0/0.78/000/00   46 NNE  AERO 46 MPH NE
10/29 46/40/43/-4/T/.../..     38 N
10/30 54/43/49/+2/0/.../..     24 SSE
10/31 71/44/58/+11/0.07/.../.. 54 S    AERO 58 MPH S
 
11/1 our morning low temp: 47F; the normal low is now 38F;
     there was 0.05 inch rainfall since midnight
 
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 NOVEMBER 1
HIGH 75 IN 2003
LOW 22 IN 1913,1923
PRECIP 2.93 INCHES IN 1985
SNOWFALL TRACE IN 1906,1951
PEAK GUST 78 ESE IN 1997
 
RECORDS FOR NOVEMBER 2
HIGH 81 IN 1950
LOW 22 IN 1965
PRECIP 1.67 INCHES IN 1970
SNOWFALL 0.2 IN 1906,1951
PEAK GUST 63 WSW IN 1973
 
TODAY'S REPORT PREPARED BY: Robert Skilling