BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, NOVEMBER 2, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MOSTLY CLOUDY, QUITE COOL AND BREEZY
 
A little sunshine was observed through
the clouds this morning but by afternoon
just a few small breaks of blue were
visible.  Northeast winds have been gusty
up to about 28 MPH with the high temperature
held to 49F by early afternoon.
 
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+]
First freeze of season 32F on 14th
Average date is 20 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: 41% of possible
Astronomical minutes:     8460 or 141.0 hours  
Campbell-Stokes sun card: 8154 or 135.9 hours                        
 
Today's observations:
 
7 A.M.
Weather: Broken stratocumulus, broken altocumulus,
altocumulus layer distant SE-SW, lone patch of
dense ground fog about 8 miles WNW 
Temperature: 45F, Dew point: 39F, Wind: NNE W at 10 kts
Sea-level pressure: 30.28 inches Hg, rising
Visibility: 35 miles, N-NE 40 miles, SE-S 20 miles 
6-hour minimum temp: 42F
24-hourly precipitation: trace
BHO SA 1155 E25 BKN 85 BKN 35 254/45/39/0310/028/
AC LYR DSNT SE-SW VSBY N-NE 40 SE-S 20 LONE SML
PTCH DENS GF 8 WNW WND 35V07/
8/530 53009 10046 20042
 
10 A.M.
Weather: Broken stratocumulus, broken altocumulus translucidus
Temperature: 48F, Dew point: 40F, Wind: NNE at 10 kts,
Wind: Direction variable north thru east,
Wind: Gust to 22 kts past hour
Sea-level pressure: 30.29 inches Hg, rising
Visibility: 40 miles, 50 miles west thru north,
20 miles east thru south
BHO SA 1455 E22 BKN 90 BKN 40 259/48/40/0310/029/
SC MDT TOPS VSBY W-N 50 E-S 20 HAZY WND 36V08/
8/530 53005
 
1 P.M. 
Weather: Broken stratocumulus, overcast altocumulus,
small break in overcast, precipitation east thru south,
sun occasionally dimly visible 
Temperature: 48F, Dew point: 40F, Wind: NNE at 14G23 kts,
Wind: Direction variable north-northwest thru east-northeast
Sea-level pressure: 30.23 inches Hg, falling
Visibility: 30 miles, 15 miles east thru south and
45 miles west-northwest 
6-hourly max. temp: 49F
BHO SA 1755 E22 BKN 130 OVC 30 238/48/40/0314G23/023/
SML BINOVC SUN OCNL DMLY VSB PCPN E-S VSBY 15 WNW 45
WND 34V07/ 8/57/ 58021 10049 20045
 
WEATHER SUMMARY FOR SUNDAY, NOVEMBER 1
 
TEMPERATURE (DEGREES F)
MAX.....58     NORMAL.....55
MIN.....44     NORMAL.....38
MEAN....51     NORMAL.....47
 
DEPARTURE FROM 30-YEAR AVERAGE.......... .+4
TOTAL DEPARTURE FOR THE MONTH.............+4 [+4.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............14    DEPARTURE........-5
TOTAL HEATING UNITS FOR THE MONTH............14    DEPARTURE........-5
TOTAL HEATING UNITS FOR THE SEASON..........635  DEPARTURE.........+25
TOTAL HEATING UNITS LAST SEASON TO DATE.....560  DIFFERENCE........+75
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............22 WNW AT  1:01 P.M. 
                   ASOS..................21 NNE AT 11:46 P.M. 
                   AEROVANE..............21 WNW AT  1:01 P.M.                    
                   DAVIS.................24 WNW AT  1:00 P.M.  
FASTEST MILE FOR YESTERDAY...............16 W   AT  5:23 A.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............16 W   AT  5:33 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........17 W   AT  8:33 A.M.
AVERAGE WIND SPEED AND DIRECTION.......10.4 W 
                   ASOS................10.3
                   DAVIS...............10.5 WNW [300 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace   DEPARTURE....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH  ............0.05   DEPARTURE....-0.10
                         ASOS..............0.03
TOTAL PRECIPITATION FOR THE YEAR..........45.16   DEPARTURE....+2.99  
                         ASOS ............46.34
                                                                 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER-NOVEMBER 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/+5/0.06/574/90  35 W    AERO 35 MPH W
10/26 59/40/50/+2/0/629/99     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/138/22     38 N
10/30 54/43/49/+2/0/013/02     24 SSE
10/31 71/44/58/+11/0.07/168/27 54 S    Aero 58 MPH S
 
11/1  58/44/51/+4/0.05/.../..   
 
11/2  our morning low temp: 42F; the normal low is now 38F
 
* mean temp. corrected on 28th from 58 to 48F
 
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
 
NEW DAILY RECORD FOR NOVEMBER 2009
None      
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
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
 
RECORDS FOR NOVEMBER 3
HIGH 75 IN 1990
LOW 21 IN 1891
PRECIP 1.92 INCHES IN 1951
SNOWFALL 0.1 IN 1951
PEAK GUST 96e SSE IN 1951
 
TODAY'S REPORT PREPARED BY: Robert Skilling