BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 23, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Overcast cirrostratus
Temperature: 38F, Dew point: 31F, Wind: N at 10 kts
Sea-level pressure: 30.20 inches Hg, rising
Visibility: 50 miles
6-hour minimum temp: 38F
BHO SA 1155 E220 OVC 50 228/38/31/3510/020/
FEW SC ALQDS XCPT W-N BRKS IOVC N-NE PARAHELION WND 27V03/
8/507 51029 10053 20038
 
10 A.M.
Weather: Broken stratocumulus, overcast altostratus
Temperature: 41F, Dew point: 31F, Wind: NE at 11G20 kts
Wind: Direction variable NW to ENE
Sea-level pressure: 30.25 inches Hg, rising
Visibility: 80 miles
BHO SA 1455 E25 BKN 900 OVC 80 245/41/31/0511G20/025/
WND 31V06/ 8/57/ 53017
 
1 P.M.   
Weather: Overcast stratocumulus
Temperature: 42F, Dew point: 32F, Wind: NE at 13 kts
Wind: Direction variable N to E
Sea-level pressure: 30.23 inches Hg, falling
Visibility: 70 miles
6-hour maximum temp: 43F
BHO SA 1755 E25 OVC 70 238/42/32/0413/023/ WND 35V08/
8/5// 55006 10043 20038
 
WEATHER SUMMARY FOR THURSDAY, OCTOBER 22
 
TEMPERATURE (DEGREES F)
MAX.....74     NORMAL.....58
MIN.....50     NORMAL.....41
MEAN....62     NORMAL.....50
 
DEPARTURE FROM 30-YEAR AVERAGE..........+12
TOTAL DEPARTURE FOR THE MONTH...........-69 [-3.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............3  DEPARTURE......-13
TOTAL HEATING UNITS FOR THE MONTH...........331  DEPARTURE......+63
TOTAL HEATING UNITS FOR THE SEASON..........488  DEPARTURE......+51
TOTAL HEATING UNITS LAST SEASON TO DATE.....375  DIFFERENCE....+113
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............30 S   AT   2:58 P.M.
                   AEROVANE..............29 SSW AT   1:33 P.M.
                   ASOS..................29 SW  AT   2:59 P.M.    
                   DAVIS.................30 SSW AT   1:34 P.M.
FASTEST MILE FOR YESTERDAY...............23 S   AT   2:57 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............23 SSW AT   2:59 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 SSW AT  10:03 P.M.  
AVERAGE WIND SPEED AND DIRECTION.......11.8 S
                   ASOS................11.9
                   DAVIS...............11.2 SSW [206 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 MONTH..............4.53   DEPARTURE....+1.45
                         ASOS..............4.50
TOTAL PRECIPITATION FOR THE YEAR..........42.41   DEPARTURE....+1.73
                         ASOS.............43.56
 
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/.../..     25 NNW
10/20 65/38/55/+2/0/.../..     23 W
10/21 68/48/58/+8/0/.../..     19 W
10/22 74/50/62/+12/0/.../..    30 S
 
10/23 our morning low temp: 38F; the normal low is now 41F
 
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
10/18: 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 23
HIGH 82 IN 1947
LOW 24 IN 1969
PRECIP 2.18 INCHES IN 1956
SNOWFALL 3.0 INCHES IN 1891
PEAK GUST 78e MPH NW IN 1941
 
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
 
TODAY'S REPORT PREPARED BY: Stephanie Radner