BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 30, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Overcast stratocumulus, small breaks in
overcast over head and along horizon distant NE to SE,
colorful sunrise
Temperature: 44F, Dew point: 39F, Wind: ESE at 5 kts
Sea-level pressure: 30.35 inches Hg, rising
Visibility: 20 miles, light haze
6-hour minimum temp: 43F
BHO SA 1155 E45 OVC 20 276/44/39/1205/035/
SML BRKS INOVC OVHD BRK INOVC ALG HRZN DSNT NE-SE
COLORFUL SUNRISE LGT HZ/ 8/5// 51008 10044 20043
 
10 A.M.
Weather: Overcast stratocumulus, small break in
overcast overhead and N to SE
Temperature: 50F, Dew point: 39F, Wind: SE at 7 kts,
Wind: Direction variable ENE to S
Sea-level pressure: 30.33 inches Hg, falling
Visibility: 20 miles, light haze
BHO SA 1455 E45 OVC 20 270/50/39/1307/033/
SML BRKS INOVC OVHD AND N-SE LGT HZ WND 07V19/ 8/5// 58006
 
1 P.M.
Weather: Overcast stratocumulus, break in
overcast distant E to S
Temperature: 54F, Dew point: 38F, Wind: S at 8 kts,
Sea-level pressure: 30.28 inches Hg, falling
Visibility: 30 miles, light haze
6-hour maximum temp: 54F
BHO SA 1755 E45 OVC 30 254/54/38/1808/028/
BRK INOVC DSNT E-S LGT HZ/ 8/5// 58016 10054 20044
 
WEATHER SUMMARY FOR THURSDAY, OCTOBER 29
 
TEMPERATURE (DEGREES F)
MAX.....46     NORMAL.....56
MIN.....40     NORMAL.....39
MEAN....43     NORMAL.....47
 
DEPARTURE FROM 30-YEAR AVERAGE...........-4
TOTAL DEPARTURE FOR THE MONTH...........-62 [-2.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............22  DEPARTURE.......+4
TOTAL HEATING UNITS FOR THE MONTH...........441  DEPARTURE......+55
TOTAL HEATING UNITS FOR THE SEASON..........598  DEPARTURE......+43
TOTAL HEATING UNITS LAST SEASON TO DATE.....494  DIFFERENCE....+104
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............38 N   AT 12:11 A.M. 
                   AEROVANE..............36 N   AT 12:11 A.M.  
                   ASOS..................35 NNE AT 12:12 A.M.  
                   DAVIS.................39 N   AT 12:11 A.M.   
FASTEST MILE FOR YESTERDAY...............21 N   AT 12:07 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............22 NNE AT 12:09 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........22 N   AT N/A
AVERAGE WIND SPEED AND DIRECTION........8.8 N
                   ASOS.................8.0
                   DAVIS................9.2 NNE [019 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH..............7.16   DEPARTURE....+3.04
                         ASOS..............7.18
TOTAL PRECIPITATION FOR THE YEAR..........45.04   DEPARTURE....+3.32
                         ASOS.............46.24
 
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/-10/0/494/74    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/-10/0/250/38    35 NNE
10/18 46/32/39/-12/1.79/000/00 43 NNE  SNOWFALL 3.0 INS
10/19 52/33/43/-8/0/628/96     25 NNW
10/20 65/38/52/+2/0/566/87     23 W    
10/21 68/48/58/+8/0/363/56     19 W
10/22 74/50/62/+12/0/265/41    30 S
10/23 57/38/48/-1/T/000/00     35 NW   AERO 32 MPH NW
10/24 67/42/55/+6/1.58/000/00  53 S    AERO 51 MPH S
10/25 64/44/54/+5/0.06/.../..  35 W    AERO 35 MPH W
10/26 59/40/50/+2/0/.../..     27 NW
10/27 50/43/47/-1/0.01/000/00  24 NNE
10/28 50/46/48/0/0.78/000/00   46 NNE
10/29 46/40/43/-4/T/.../..     38 N
 
10/30 our morning low temp: 43F; the normal low is now 39F
 
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
10/16: NEW RECORD DAILY SNOWFALL TRACE; 
      surpasses previous zero for the date
10/18: NEW RECORD DAILY SNOWFALL 3.0 INS; 
      surpasses previous trace in 1972
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 30
HIGH 75 IN 1946,1989
LOW 21 IN 1928
PRECIP 1.85 INCHES IN 1917
SNOWFALL 0.6 INCHES IN 2000
PEAK GUST 66 NW IN 1963
 
RECORDS FOR OCTOBER 31
HIGH 79 IN 1946
LOW 22 IN 1904
PRECIP 3.74 INCHES IN 1991
SNOWFALL TRACE IN 1906
PEAK GUST 70e S IN 1945
 
TODAY'S REPORT PREPARED BY: Stephanie Radner