BLUE HILL OBSERVATORY MILTON, MA
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 28, 2010
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A REPEAT OF LATE SEASON RECORDS AGAIN
NEW RECORD HIGH MINIMUM TEMPERATURE FOR OCTOBER 27TH....
ALSO NEW LATE SEASON RECORD RESET...
SKIES CLEAR AND AIR MASS DRIES OUT
VERY QUICKLY DURING FORENOON... 
 
Yesterday's minimum temperature of 63F which occurred
very early yesterday morning surpassed the previous high
minimum of 59F on October 27, 1963. 
 
In addition, the minimum of 63F on October 27 surpasses the
previous late season record of 62F just set on October 26; 
was previously 63F on October 19 in 1928 and 2007.  
 
The warmest minimum temperature in any year starting 
with today's date is 60F on October 29, 1918, and
October 30, 1946. 
The November record is 60F on November 8, 1996.
 
The dense fog and very high humidity with dew points
in the lower to middle 60's early today was swept away
by increasing southwest winds. By early afternoon with
sunshine and southwest winds averaging 15 to 25 MPH gusts
were reaching 30 to 40 MPH. It became a beautiful late
October day with temperatures in the mid-70's and dew
points falling to the low 40's.  The relative humidity
was down near 30%.  
 
Today's observations: 
 
7 A.M.
Weather: Partial obscurement with heavy fog, 8/10 of sky
covered by surface based fog, sun disc visible,
heavy dew all surfaces 
Temperature: 62F, Dew point: 62F; Wind: S at 12 kts
Sea-level pressure: 29.84 inches Hg, rising slightly
Visibility: 1/16 miles, lowered past hour
6-hour minimum temp: 61F
24-hour rainfall: 0.05 inch
BHO SA 1155 –X 1/16F 104/62/62/1812/984/ F8 FG INCRSD PST HR
SUN DISC VSB HEAVY DEW ALL SFCS/ 8//// 52000 ASOS 70006
MANUAL 70005 10064 20061
 
10 A.M.
Weather: Scattered altocumulus
Temperature: 69F, Dew point: 54F; Wind: SW at 14G21 kts,
Wind: Direction S to W, gradually veering 
Sea-level pressure: 29.82 inches Hg, falling
Visibility: 40 miles, NE-SE 30 miles, WNW 50 miles 
BHO SA 1455 130 SCT 40 099/69/54/2314G21/982/ LGT DSNT HZ VSBY 
NE-SE 30 WNW 50 WND 19V26 GRDLY VEERING/ 8/030 58005
 
1 P.M. 
Weather: Scattered altocumulus and altocumulus lenticularis,
scattered cirrus, thin broken cirrus, few cumulus fractus and
small cumulus forming W-N 
Temperature: 74F, Dew point: 41F; Wind: SW at 17G29 kts,
Wind: Peak wind SW at 29 kts at 12:49 p.m.,
Wind: Direction variable S-W 
Sea-level pressure: 29.75 inches Hg, falling 
Visibility: 65 miles, 70 miles NW
6-hour maximum temp: 75F 
BHO SA 1755 130 SCT 180 SCT 220 SCT 250 –BKN 65 074/74/41/2317G29/
975/ FEW LWR AC PTCHS ACSL VSBY NW 70 PK WND 2329/49/ WND 18V27/ 
8/141 57025 10075 20062
 
WEATHER SUMMARY FOR WEDNESDAY, OCTOBER 27
 
TEMPERATURE (DEGREES F)
MAX.....68     NORMAL.....56
MIN.....63     NORMAL.....40
MEAN....66     NORMAL.....48
 
DEPARTURE FROM 30-YEAR NORMAL..............+18
TOTAL DEPARTURE FOR THE MONTH..............+15 [+0.4 DEGREE/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0    DEPARTURE.......-17
TOTAL HEATING UNITS FOR THE MONTH...........338    DEPARTURE.......-13
TOTAL HEATING UNITS FOR THE SEASON..........417    DEPARTURE......-103
TOTAL HEATING UNITS LAST SEASON TO DATE.....559    DIFFERENCE.....-142
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 S   AT   1:07 P.M. *
                   AEROVANE..............37 S   AT   2:33 P.M. * 
                   ASOS..................36 S   AT   9:41 A.M.   
                   DAVIS.................35 S   AT   2:32 P.M.   
THE FASTEST MILE FOR YESTERDAY...........26 S   AT   2:38 P.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE............26 S   AT   2:38 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........27 S   AT   2:38 P.M.   
AVERAGE WIND SPEED AND DIRECTION........18.7 S
                   ASOS................ 18.0
                   DAVIS................16.5 S [180 DEG]
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE........-0.10
                         ASOS..............0.06
TOTAL PRECIPITATION FOR THE MONTH..........5.70  DEPARTURE........+1.88
                         ASOS..............5.71
TOTAL PRECIPITATION FOR THE YEAR..........53.72  DEPARTURE.......+12.30
                         ASOS.............53.55**
** ASOS missing rainfall due to system failure on 6/24-25
 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2010 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  80/55/68/+11/0.56/035/05  55 SSE  AERO 63 MPH SSE
10/2  65/46/56/0/0.00/688/98    28 WNW  AERO 31 MPH WNW
10/3  55/43/49/-7/T/133/19      35 NNE  AERO 39 MPH NNE
10/4  54/48/51/-5/0.78/000/00   39 NNE  AERO 43 MPH NNE
10/5  57/51/54/-1/0.40/000/00   37 NE   AERO 39 MPH NNE
10/6  57/49/53/-2/1.63/000/00   47 NE   AERO 51 MPH NE
10/7  62/47/55/0/0.00/275/40    37 W    AERO 40 MPH W
10/8  70/47/59/+5/0.00/610/89   35 WSW  AERO 37 MPH WSW
10/9  62/43/53/-1/0.00/675/99   33 WNW  AERO 37 MPH WNW
10/10 64/38/51/-3/0.00/679/100  25 SW   AERO 29 MPH SSW
10/11 68/47/58/+5/0.00/542/80   28 W   
10/12 61/43/52/-1/0.01/297/44   24 ENE
10/13 61/38/50/-2/0.00/663/99   18 NW
10/14 59/45/52/0/0.41/294/44    29 ENE
10/15 51/39/45/-7/1.71/033/05   48 WSW  AERO 50 MPH WSW TSTM 
10/16 55/39/47/-4/0.00/544/82   47 WNW  AERO 54 MPH WNW
10/17 63/38/51/0/0.00/581/88    43 W    AERO 47 MPH W
10/18 57/41/49/-2/0.00/519/79   32 W    AERO 35 MPH W
10/19 57/38/48/-3/0.00/497/76   21 W 
10/20 61/44/53/+3/T/.../..      21 S
10/21 56/39/48/-2/0.07/.../..   55 W    AERO 62 MPH W
10/22 47/34/41/-9/T/T/.../..    51 W    AERO 56 MPH W trace snow
10/23 56/35/46/-3/0.00/.../..   32 W    AERO 37 MPH W
10/24 51/39/45/-4/0.01/013/02   17 SSE
10/25 65/47/56/+7/T/.../..      36 S    AERO 38 MPH S
10/26 77/62/70/+22/0.00/.../..  32 S    AERO 36 MPH S
10/27 68/63/66/+18/0.11/000/00  35 S    AERO 37 MPH S 
 
10/28 our morning low temp: 61F; our normal low temp. is now 39F
 
NEW DAILY RECORDS FOR OCTOBER 2010
 
10/22: Daily snowfall: Trace; equals record set in 1969.
10/26: NEW RECORD HIGH MINIMUM TEMP. OF 62F;
the previous record was 57F in 1991.
10/26: NEW LATE SEASON RECORD HIGH MINIMUM TEMP. 62F;
the previous record was 62F on 10/22/1979
10/27: NEW RECORD HIGH MINIMUM TEMP. OF 63F;
the previous record was 59F in 1963.
10/27: NEW LATE SEASON RECORD HIGH MINIMUM TEMP: 63F;
the previous record was 62F set on 10/26/2010.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 28
HIGH 81 IN 1919
LOW 23 IN 1914
PRECIP 2.46 INCHES IN 2006
SNOWFALL TRACE IN 1934,1957,1979
PEAK GUST 71 MPH SSW IN 1995
 
RECORDS FOR OCTOBER 29
HIGH 74 IN 1989
LOW 23 IN 1891
PRECIP 2.27 INCHES IN 1953
SNOWFALL 1.5 INCHES IN 2005
PEAK GUST 69 S IN 2003
 
TODAY'S REPORT PREPARED BY: Robert Skilling