BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 18, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Overcast, light rain and fog
Temperature: 42F, Dew point: 41F, Wind: N at 16G20 kt
Sea-level pressure: 30.11 inches Hg, rising
Visibility: 1 mile
6-hour minimum temp: 42F
24-hour precipitation: 0.07 inches
BHO SA 1155 5 OVC 1R-F 198/42/41/0114G20/011/
8/6// 53003 6007/ 70007 10046 20042
 
10 A.M.
Weather: Overcast, moderate rain and fog
Temperature: 42F, Dew point: 42F, Wind: NNE at 25G32 kt
Sea-level pressure: 30.07 inches Hg,  falling
Visibility: 1 mile
3-hour precipitation: 0.43 inches
BHO SA 1455 5 OVC 1RF 183/42/42/0325G32/007/
PK WND 0334/1442/ 8/6// 56015 6043/
 
1 P.M.   
Weather: Overcast, moderate rain and fog
Temperature: 41F, Dew point: 41F, Wind: N at 20G34 kt
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 1 mile
6-hour maximum temp: 42F
6-hour precipitation: 0.77 inches
BHO SA 1755 5 OVC 1RF 163/41/41/3520G34/001/
WND BACKING PK WND 0134/1734/ 8/6// 58020 6077/ 10042 20041
 
 
WEATHER SUMMARY FOR SATURDAY, OCTOBER 17
 
TEMPERATURE (DEGREES F)
MAX.....48    NORMAL.....60
MIN.....33    NORMAL.....42
MEAN....41    NORMAL.....51
 
DEPARTURE FROM 30-YEAR AVERAGE..........-10
TOTAL DEPARTURE FOR THE MONTH...........-71 [-4.4 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............24  DEPARTURE......+10
TOTAL HEATING UNITS FOR THE MONTH...........260  DEPARTURE......+67
TOTAL HEATING UNITS FOR THE SEASON..........417  DEPARTURE......+55
TOTAL HEATING UNITS LAST SEASON TO DATE.....271  DIFFERENCE....+146
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 NNE AT  11:00 P.M.
                   AEROVANE..............32 NNE AT  11:15 P.M.
                   ASOS..................33 NE  AT  11:00 P.M. 
                   DAVIS.................32 NNE AT  10:59 P.M.
FASTEST MILE FOR YESTERDAY...............24 NNE AT  11:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............21 ENE AT  11:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 N   AT   3:39 A.M.
AVERAGE WIND SPEED AND DIRECTION.......12.8 N
                   ASOS................12.2
                   DAVIS...............11.6 N [6 DEG]
* Last of several occurrences.
 
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..............2.81   DEPARTURE....+0.43
                         ASOS..............2.81
TOTAL PRECIPITATION FOR THE YEAR..........40.69   DEPARTURE....+0.71
                         ASOS.............41.87
 
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/T/471/70     23 SSW
10/13 51/36/44/-8/0.20/074/11  35 WNW 
10/14 52/32/42/-10/0/.../..    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/.../.../..  35 NNE
 
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
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL TRACE IN 1972
PEAK GUST 66 MPH S IN 1967
 
RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967
 
TODAY'S REPORT PREPARED BY: Andrew Hoell