BLUE HILL OBSERVATORY MILTON, MA
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 25, 2010
ALL TIMES ARE IN EASTERN STANDARD TIME
 
DENSE EARLY MORNING FOG THEN LOW CLOUDS
HEAVY FOG BECOMES THIN FOG AND HAZE
WARM MOIST AIR ARRIVES TODAY
 
Low stratus and dense fog obscured the summit
early this morning and thinned out to a low overcast
layer with higher clouds visible by early afternoon.  
Our visibility only made it up from 1/16 mile early 
to close to 8 miles in the early afternoon.
A combination of thin fog and haze prevailed.
The temperature was rising into the 60's by
early afternoon with dew points rising through
the 50's today.
 
Today's observations: 
 
7 A.M.
Weather: Obscurement, heavy fog, heavy dew all surfaces 
Temperature: 48F, Dew point: 48F; Wind: Calm
Sea-level pressure: 30.03 inches Hg, steady
Visibility: 1/16 heavy fog, 1/8 past hour
6-hour minimum temp: 47F
BHO SA 1155 W2 X 1/16F 171/48/48/0000/003/ VSBY 1/8 PST HR 
HVY DEW ALL SFCS/ 8//// 57000 MANUAL 70001 ASOS 70001
10050 20047
 
10 A.M.
Weather: Obscurement with heavy fog, stratus drifting over
the summit  
Temperature: 53F, Dew point: 53F; Wind: SSE at 6 kts
Sea-level pressure: 30.02 inches Hg, falling
Visibility: 1/8 mile
BHO SA 1455 W2 X 1/8F 167/53/53/1606/002/ STRA DRFTG OVR SMT/ 
8//// 57004 
 
1 P.M.
Weather: Overcast variable broken stratus, higher overcast 
clouds visible, sun disc occasionally visible 
Temperature: 61F, Dew point: 56F; Wind: S at 8 kts
Wind: Direction variable SE to S
Sea-level pressure: 29.95 inches Hg, falling
Visibility: 8 miles, 9 miles north
BHO SA 1755 E7V OVC 8 143/61/56/1708/995/ 7 OVC V BKN
HIER CLD VSB SUN DISC OCNL VSB VSBY N 9 THN FH ALQDS
WND 13V19/ 8/6// 58024
 
WEATHER SUMMARY FOR SUNDAY, OCTOBER 24
 
TEMPERATURE (DEGREES F)
MAX.....51     NORMAL.....57
MIN.....39     NORMAL.....40
MEAN....45     NORMAL.....49
 
DEPARTURE FROM 30-YEAR NORMAL..............-4
TOTAL DEPARTURE FOR THE MONTH.............-32 [-1.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............20    DEPARTURE........+4
TOTAL HEATING UNITS FOR THE MONTH...........329    DEPARTURE.......+29
TOTAL HEATING UNITS FOR THE SEASON..........408    DEPARTURE.......-61
TOTAL HEATING UNITS LAST SEASON TO DATE.....515    DIFFERENCE.....-107
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............17 SSE AT   3:33 P.M. 
                   AEROVANE..............16 SSE AT   3:33 P.M. 
                   ASOS..................16 NNW AT  12:29 A.M. 
                   DAVIS.................15 E   AT   8-9  P.M. 
THE FASTEST MILE FOR YESTERDAY...........11 SSE AT   8:59 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE............13 NNW AT  12:29 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........11 E   AT   8:09 P.M. 
AVERAGE WIND SPEED AND DIRECTION.........6.0 SSE
                   ASOS................  6.1
                   DAVIS.................5.4 NE  [040 DEG]
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE........-0.14
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........5.59  DEPARTURE........+2.22
                         ASOS..............5.61
TOTAL PRECIPITATION FOR THE YEAR..........53.61  DEPARTURE.......+12.64
                         ASOS.............53.45**
** 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 our morning low temp: 47F; the normal low is now 40F
 
NEW DAILY RECORDS FOR OCTOBER 2010
10/22: Daily snowfall: Trace; equals record set in 1969.
 
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: Robert Skilling