BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 13, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SPRINKLES OF RAIN LAST EVENING BECAME
A STEADY LIGHT RAIN EARLY TODAY
 
Some very light showers last evening
amounted to only a trace of precipitation
but steady light began by 4 a.m. EDT this
morning.  When the rainfall ended around
12:30 p.m. EDT early this afternoon the
total was 0.20 inch. Temperatures were
running close to 10 degrees cooler than
normal at 51F when cloudiness began to
partially clear early this afternoon. 
 
Today's observations:
 
7 A.M.
Weather: Overcast nimbostratus with few stratus
fractus developing and few stratus drifting below
summit over hills to the east, light rain and fog
Temperature: 43F, Dew point: 42F, Wind: SE at 6 kts
Sea-level pressure: 30.05 inches Hg, falling
Visibility: 5 miles
6-hour minimum temp: 42F
24-hour precip: 0.07 inch
BHO SA 1155 E30 OVC 5R-F 175/43/42/1306/005/
FEW STFRA FRMG FEW STFRA DRFTG BLO SMT E/
8/72/ 58023 ASOS 60006 MANUAL 6007/
ASOS 70006 MANUAL 70007 10044 20042 
 
10 A.M.
Weather: Obscurement with fog, light rain and
light drizzle 
Temperature: 44F, Dew point: 44F, Wind: NW at 13 kts,
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 1/16 mile
3-hourly precip: 0.07 inch 
BHO SA 1455 W2 X 1/16R-L-F 146/44/44/3113/996/
8//// 58029 ASOS 60006 MANUAL 6007/
 
1 P.M.   
Weather: Scattered stratus, broken altocumulus,
few altocumulus castellanus 
Temperature: 51F, Dew point: 49F, Wind: W at 12 kts,
Wind: Direction variable WSW to NW
Sea-level pressure: 29.91 inches Hg, falling
Visibility: 20 miles
6-hour maximum temp: 51F
6-hourly precip: 0.13 inch
BHO SA 1755 9 SCT E85 BKN 20 128/51/49/2812/991/
FEW ACC WND 25V31/ 8/680 56018 ASOS 60014 MANUAL 6013/
10051 20043
 
WEATHER SUMMARY FOR MONDAY, OCTOBER 12, COLUMBUS DAY
 
TEMPERATURE (DEGREES F)
MAX.....53    NORMAL.....62
MIN.....36    NORMAL.....44
MEAN....45    NORMAL.....53
 
DEPARTURE FROM 30-YEAR AVERAGE...........-8
TOTAL DEPARTURE FOR THE MONTH...........-14 [-1.4 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............20  DEPARTURE.......+8
TOTAL HEATING UNITS FOR THE MONTH...........136  DEPARTURE......+10
TOTAL HEATING UNITS FOR THE SEASON..........288  DEPARTURE.......-2
TOTAL HEATING UNITS LAST SEASON TO DATE.....220  DIFFERENCE.....+53
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 SSW AT  7:51 P.M. 
                   AEROVANE..............22 SSW AT  7:51 P.M. 
                   ASOS..................22 SSW AT  7:52 P.M.  
                   DAVIS.................23 SSW AT  7:50 P.M. 
FASTEST MILE FOR YESTERDAY...............17 SSW AT  7:52 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............17 SSW AT  7:52 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 SSW AT  7:52 P.M.  
AVERAGE WIND SPEED AND DIRECTION........8.5 WNW
                   ASOS.................8.6
                   DAVIS................8.8 W [260 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07   DEPARTURE....-0.07
                         ASOS..............0.06
TOTAL PRECIPITATION FOR MONTH..............2.18   DEPARTURE....+0.50
                         ASOS..............2.20
TOTAL PRECIPITATION FOR THE YEAR..........40.06   DEPARTURE....+0.78
                         ASOS.............41.26
 
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/.../.../..   23 SSW
 
10/13 our overnight low temp: 42F; the normal low is now 44F
 
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
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 13
HIGH 84 IN 1930,1954
LOW 30 IN 1934,1936,1988
PRECIP 5.92 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 46e MPH W IN 1950
 
RECORDS FOR OCTOBER 14
HIGH 79F IN 2000
LOW 28F IN 1958
PRECIP 2.69 INCHES IN 1990
SNOWFALL 2.0 INCHES IN 1913
PEAK GUST 63e W IN 1976
 
TODAY'S REPORT PREPARED BY: Robert Skilling