BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 17, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Obscured with light rain and fog
Temperature: 60F, Dew point: 60F, Wind: SSW at 12 kt
Sea-level pressure: 29.87 inches Hg, rising
Visibility: 1/16 of a mile
6-hour minimum temp: 60F
24-hour precipitation: 0.04 inches
BHO SA 1155 W2 X1 1/16R-F 115/60/60/2012/987/
8//// 53012 ASOS 60004 70004 10061 20060
 
10 A.M.  
Weather: Overcast
Temperature: 53F, Dew point: 51F, Wind: W at 10 kt 
Sea-level pressure: 29.93 inches Hg, rising
Visibility: 40 miles
BHO SA 1455 E10 OVC 40 137/53/51/2810/993/
VIRGA DSNT NE AND SE/ 8/6// 51022
 
1 P.M.  
Weather: Scattered stratocumulus; overcast altostratus
Temperature: 56F, Dew point: 44F, Wind: WNW at 12G20 kt
Sea-level pressure: 29.95 inches Hg, rising
Visibility: 50 miles
6-hour maximum temp: 61F
6-hour precipitation: 0.05 inches
BHO SA 1755 50 SCT E130 OVC 50 142/56/44/3012G20/995/
WND BACKING/ 8/77/ 6005/ 51005 10061 20052
  
WEATHER SUMMARY FOR SATURDAY, MAY 16
 
TEMPERATURE (DEGREES F)
MAX.....68    NORMAL.....67
MIN.....54    NORMAL.....47
MEAN....61    NORMAL.....57
 
DEPARTURE FROM 30-YEAR NORMAL...........+4
TOTAL DEPARTURE FOR THE MONTH..........+46 [+2.7 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............4  DEPARTURE.......-5
TOTAL HEATING UNITS FOR THE MONTH...........121  DEPARTURE......-53
TOTAL HEATING UNITS FOR THE SEASON.........6017  DEPARTURE.....-183
TOTAL HEATING UNITS LAST SEASON TO DATE....5814  DIFFERENCE....+203
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............35 S AT 11:13 P.M.
                   AEROVANE.............35 S AT  9:56 P.M.
                   ASOS.................33 S AT 11:12 P.M.
                   DAVIS................32 S AT 10:58 P.M.
FASTEST MILE FOR YESTERDAY..............27 S AT 10:50 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........25 S AT 11:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........26 S AT 10:40 P.M.
AVERAGE WIND SPEED AND DIRECTION.......11.5 NE
                   ASOS................11.1
                   DAVIS...............10.4 SSE [149 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.04  DEPARTURE....-0.08
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE MONTH..........2.29  DEPARTURE....+0.32
                         ASOS..............2.28 
TOTAL PRECIPITATION FOR THE YEAR..........16.90  DEPARTURE....-3.02
                         ASOS.............17.96 
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE..... 0.0
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.....-0.1
TOTAL SNOWFALL FOR THE SEASON..............78.9  DEPARTURE.....18.8 
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
5/1  64/53/59/+7/T/000/00          37 SSW   AERO 37 MPH SSW
5/2  68/52/60/+8/0.05/263/31       32 WNW
5/3  64/48/56/+3/T/068/08          25 S
5/4  64/48/56/+3/0.01/009/01       17 SSW
5/5  52/44/48/-5/0.95/000/00       43 NNE   AERO 40 MPH NNE
5/6  63/43/53/-1/0.40/189/22       24 SSE  
5/7  68/49/59/+5/0.60/009/01       29 S    
5/8  75/52/64/+10/0/690/80         28 S
5/9  71/55/63/+8/0.13/104/12       31 W     TSTM
5/10 65/46/56/+1/0/840/97          53 W     Aero 50 MPH W
5/11 63/41/52/-3/0/781/90          24 WNW
5/12 63/45/54/-2/0/.../..          22 ENE
5/13 70/45/58/+2/0/.../..          31 SSE   AERO 29 MPH SSE
5/14 62/47/55/-2/0.10/.../..       53 S     AERO 52 MPH S
5/15 76/54/65/+8/0/.../..          38 S     AERO 38 MPH S
5/16 68/54/61/+4/../../.../..      35 S     AERO 35 MPH S
 
NEW DAILY RECORDS FOR MAY 2009...
5/14: RECORD PEAK WIND GUST 53 MPH S;
      Surpasses previous record of 50 MPH SW in 1976
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 17
HIGH 88F IN 1974, 1977
LOW 34F IN 1956, 1957
PRECIP 2.07 INS IN 1916
PEAK GUST 52 MPH SW IN 1967, W IN 1974
 
RECORDS FOR MAY 18
HIGH 88F IN 1906, 1936, 1986
LOW 35F IN 2002
PRECIP 1.93 INS IN 2007
SNOW TRACE IN 2002 (Ice pellets)
PEAK GUST 64 MPH SSW IN 2000
 
TODAY'S REPORT PREPARED BY: Andrew Hoell