BLUE HILL OBSERVATORY MILTON, MA
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 24, 2010
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LOW WINDS, COOL AND OVERCAST TODAY...
 
An overcast layer of altocumulus clouds built up
in the region early this morning keeping temperatures
on the cool side for the fourth consecutive day. After an
overnight low of 39F, the air temperature has steadily
climbed only into the upper 40s through 11:30 AM EDT.
Meanwhile winds have slowed down tremendously as a warm front
approaches from the southwest. Since 8:00 AM EDT, the contacting
anemometer has registered an average wind speed of only 4 MPH
while the Merlin has averaged only 3.4 MPH with a peak gust of
8 MPH!
 
 
Today's observations: 
 
7 A.M.
Weather: Overcast altocumulus, few stratocumulus along
horizon distant NNW-E
Temperature: 40F, Dew point: 31F; Wind: N at 4 kts
Wind: Light
Sea-level pressure: 30.20 inches Hg, rising
Visibility: 65 miles
6-hour minimum temp: 39F
BHO SA 1155 E75 OVC 65 227/40/31/3504/020/ FEW SC ALG
HRZN DSNT NNW-E WND LGT/ 8/53/ 50003 10040 20039
 
10 A.M.
Weather: Overcast stratocumulus, thin spots in overcast
SE-SW and overhead, sun disc occasionally visible
Temperature: 47F, Dew point: 32F; Wind: SSE at 5 kts
Wind: Light and Variable
Sea-level pressure: 30.19 inches Hg, falling
Visibility: 65 miles
BHO SA 1455 E35 OVC 65 225/47/32/1505/019/ THN SPTS IOVC
SE-SW AND OVHD SUN DSC OCNLY VSBL WND LGT AND VRB/ 8/500
 
WEATHER SUMMARY FOR SATURDAY, OCTOBER 23
 
TEMPERATURE (DEGREES F)
MAX.....56     NORMAL.....58
MIN.....35     NORMAL.....41
MEAN....46     NORMAL.....49
 
DEPARTURE FROM 30-YEAR NORMAL..............-3
TOTAL DEPARTURE FOR THE MONTH.............-28 [-1.4 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............19    DEPARTURE........+3
TOTAL HEATING UNITS FOR THE MONTH...........309    DEPARTURE.......+25
TOTAL HEATING UNITS FOR THE SEASON..........388    DEPARTURE.......-65
TOTAL HEATING UNITS LAST SEASON TO DATE.....505    DIFFERENCE.....-117
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............32 W   AT  11:06 A.M.
                   AEROVANE..............37 W   AT  11:06 A.M.
                   ASOS..................35 W   AT  11:06 A.M.
                   DAVIS.................33 WSW AT  11:06 A.M.
THE FASTEST MILE FOR YESTERDAY...........26 W   AT  11:07 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............23 W   AT  11:07 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 W   AT  11:08 A.M.
AVERAGE WIND SPEED AND DIRECTION.......13.0 W
                   ASOS................12.0
                   DAVIS...............12.1 W [267 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE........-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........5.58  DEPARTURE........+2.36
                         ASOS..............5.60
TOTAL PRECIPITATION FOR THE YEAR..........53.60  DEPARTURE.......+12.78
                         ASOS.............53.44**
** 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/-9/0.00/.../..   51 W    AERO 56 MPH W
10/23 56/35/46/-3/0.00/.../..   32 W    AERO 37 MPH W
 
10/24 morning low temp: 39F; 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 24
HIGH 79 IN 1963
LOW 22 IN 1969
PRECIP 2.96 INCHES IN 1890
SNOWFALL 1.8 INCHES IN 1960
PEAK GUST 70 MPH SE IN 1959
 
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
 
TODAY'S REPORT PREPARED BY: Eli Melaas