BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 30, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
STILL ANOTHER VERY SUNNY, WARM AND DRY DAY
PERFECTLY CLEAR SKY AT NOON TODAY
 
Very sunny, warm and dry weather continues today with 
our high temperature approaching 80 degrees this afternoon. 
The normal high is still only 71 degrees and this morning's
low of 56 was 5 degrees warmer than normal.
 
Other than a few very thin cirrus clouds today's sky has been
perfectly clear but visibility is limited to 40 to 50 miles in 
light haze.  
  
Today's observations:
 
7 A.M.   
Weather: High thin scattered cirrus clouds 
Temperature: 64F, Dew point: 47F, Wind: NNW at 04 kts 
Sea-level pressure: 30.21 inches Hg, rising  
Visibility: 40 miles, WNW 50, NW-E 30      
6-hour min temp. 56 deg.   
BHO SA 1155 300 -SCT 40 229/64/47/3404/021/  
THN K LYR ALG HRZNS VSBY WNW 50 NW-E 30/
8/001 50005 10064 20056  
      
10 A.M. 
Weather: Clear
Temperature: 72F, Dew point: 47F, Wind: W at 05 kts
Wind: Light and variable
Sea-level pressure: 30.20 inches Hg, steady
Visibility: 35-45 miles, light haze 
 
1 P.M. 
Weather: Clear, few cirrus NW-N  
Temperature: 79F, Dew point: 48F, Wind: WSW at 08 kts
Wind: direction variability S-NW
Sea-level pressure: 30.15 inches Hg, falling
Visibility: 50 miles, light haze  
BHO SA 1755 CLR 50 209/79/48/2408/015/ THN CI DSNT NW-N 
LGT HZ WND 18V31/ 8/001 58017 10080 20064 
 
WEATHER SUMMARY FOR TUESDAY, MAY 29 
 
TEMPERATURE (DEGREES F)
MAX.....76    NORMAL.....71 
MIN.....53    NORMAL.....51
MEAN....65    NORMAL.....61
DEPARTURE FROM 30-YEAR NORMAL..........+ 4
TOTAL DEPARTURE FOR THE MONTH..........+78 (+2.5 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............0  DEPARTURE.........-5
TOTAL HEATING UNITS FOR THE MONTH..........212  DEPARTURE........-49  
TOTAL HEATING UNITS FOR THE SEASON........5828  DEPARTURE.......-459
TOTAL HEATING UNITS LAST SEASON TO DATE...5711  DIFFERENCE......+117 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............30 WNW AT 6:54 A.M.  * 
                   AEROVANE.............28 WNW AT 6:52 A.M. 
                   ASOS.................30 NW  AT 6:53 A.M.    
                   DAVIS................30 WNW AT 6:52 A.M.    
FASTEST MILE FOR YESTERDAY..............21 WNW AT 7:21 A.M.         
MAXIMUM 2-MINUTE ASOS AVERAGE...........21 NW  AT 7:23 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........22 WNW AT 7:22 A.M.      
AVERAGE WIND SPEED AND DIRECTION........11.7 WNW  
                   ASOS.................11.0  
                   DAVIS................12.2 WNW [300 deg]
* last of several occurrences...
 
NEW ASOS ULTRASONIC WIND SYSTEM INSTALLED 25 MAY
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace DEPARTURE.....-0.12
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE MONTH..........3.71  DEPARTURE.....+0.18 
                         ASOS..............3.64    
TOTAL PRECIPITATION FOR THE YEAR..........24.13  DEPARTURE.....+2.65
                         ASOS.............23.61    
 
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..............27.6  DEPARTURE.....-32.5  
    
PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
5/1  67/44/56/+4/0/0/624/74      33 NW 
5/2  64/45/55/+3/0.06/0/381/45   36 NW    Aero 33 MPH WNW
5/3  67/42/55/+2/0/0/849/100     38 W     Aero 37 MPH W
5/4  66/44/55/+2/0/0/842/99      39 WNW   Aero 40 MPH WNW 
5/5  65/45/55/+2/0/0/384/45      33 N  
5/6  51/42/47/-7/T/0/514/60      36 N     Aero 33 MPH N 
5/7  68/39/54/0/0/0/798/93       25 S
5/8  77/43/60/+6/0/0/851/99      33 S     Aero 31 MPH S 
5/9  85/54/70/+15/0/0/707/92     30 S 
5/10 85/60/73/+18/0/0/692/80     29 S     Aero 27 MPH S
5/11 74/60/67/+12/0.02/0/355/41  23 S     TSTM A.M.  
5/12 63/47/55/-1/0.02/0/469/54   32 NE    
5/13 65/46/56/0/T/0/775/89       33 WNW   Aero 33 MPH WNW 
5/14 73/43/58/+1/0/0/822/94      30 SSW
5/15 80/50/65/+8/0.01/0/210/24   30 S     TSTM evening   
5/16 66/44/55/-2/0.54/0/527/60   40 NW    TSTM P.M.  
5/17 50/42/46/-11/0.01/0/009/01  28 NE  
5/18 42/39/41/-17/1.93/0/000/00  37 NNE
5/19 51/40/46/-12/0.71/0/000/00  25 NNW
5/20 59/49/54/-4/0.41/0/035/04   30 W     TSTM P.M.  
5/21 63/46/55/-4/0/0/693/78      29 WNW
5/22 71/46/59/0/0/0/800/90       25 SSE  
5/23 74/47/61/0/0/757/85         30 SSE 
5/24 86/50/68/+8/0/0/828/93      25 WSW
5/25 91/66/79/+19/0/0/769/86     24 W
5/26 85/66/76/+16/0/0/689/77     30 W  
5/27 73/58/66/+5/0/0/.../..      22 SSE
5/28 82/58/70/+9/T/0/476/53      33 WNW 
5/29 76/53/65/+4/0/0/873/97      30 WNW 
 
5/30 morning low temp. 56 deg; normal low now 51 deg. 
      
NEW DAILY RECORDS FOR MAY:
 
5/18 Record low maximum temperature, 42; previous 48 in 1895 and 1956.
5/18 Record daily precipitation, 1.93; previous 1.58 inches in 2002.
5/25 Record high maximum temperature, 91; previous 89 in 1981.
5/25 Record high minimum temperature, 66; previous 65 in 1991.
5/26 Record high minimum temperature, 66; previous 63 in 1981.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945
 
RECORDS FOR MAY 31
HIGH 92F IN 1944,1987
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945
 
TODAY'S REPORT PREPARED By: Robert Skilling