BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 21, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNNY AND SEASONABLY WARM WEATHER TODAY
 
Bright sunshine has prevailed for the day through
early afternoon with temperatures rising from 
a near normal low of 56 degrees this morning to 
77 degrees early this afternoon and that is right
on the normal high for the date.  Winds have 
prevailed from the west to west-northwest with 
our peak wind gusts around 25 to 28 MPH.  
 
Today's observations:
 
7 A.M.   
Weather: Clear, cirrus SW-NW 
Temperature: 67F, Dew point: 53F, Wind: WNW at 11 kts 
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 60 miles, 70 miles NW    
6-hour min temp. 56F   
24-hour precip: 0.38 in. 
BHO SA 1155 CLR 60 118/64/53/3011/988/ 
CI SW-NW VSBY NW 70/ 8/001 50006 ASOS 
70038 MANUAL 70038 10064 20056 
        
10 A.M. 
Weather: High thin scattered cirrus clouds   
Temperature: 72F, Dew point: 52F, Wind: W at 15G18 kts
Sea-level pressure: 29.85 inches Hg, falling 
Visibility: 70 miles  
BHO SA 1455 250 –SCT 300 –SCT 70 108/72/52/2815G18/985/ 
CUFRA/CU FRMG ALQDS VSBY NW 70 WND 24V31/ 
8/101 57010
 
1 P.M. 
Weather: Scattered cumulus clouds  
Temperature: 75F, Dew point: 53F, Wind: W at 14G21 kts
Sea-level pressure: 29.80 inches Hg, falling
Visibility: 70 miles 
6-hour max. temp. 77 deg.      
6-hour precip: 0.00 in. 
BHO SA 1755 55 SCT 70 091/75/53/2714G21/980/ 
FEW MDT CU WND 24V30/ 8/200 57017 10077 20064 
 
WEATHER SUMMARY FOR WEDNESDAY, JUNE 20 
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....76 
MIN.....60    NORMAL.....57
MEAN....67    NORMAL.....67
DEPARTURE FROM 30-YEAR NORMAL............ 0
TOTAL DEPARTURE FOR THE MONTH............-6 (-0.5 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............0  DEPARTURE.........-2
TOTAL HEATING UNITS FOR THE MONTH...........71  DEPARTURE........+ 9   
TOTAL HEATING UNITS FOR THE SEASON........5902  DEPARTURE.......-457
TOTAL HEATING UNITS LAST SEASON TO DATE...5790  DIFFERENCE......+112 *
 
* corrected 
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............25 WNW AT 6:07 P.M. *    
                   AEROVANE.............24 W   AT 3:42 P.M.  
                   ASOS.................N/A  #
                   DAVIS................26 W   AT 3:41 P.M.       
FASTEST MILE FOR YESTERDAY..............20 W   AT 3:42 P.M.      
MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........22 W   AT 3:42 P.M.         
AVERAGE WIND SPEED AND DIRECTION........10.7 W  
                   ASOS.................N/A  #
                   DAVIS................10.3 SW [230 deg] 
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
THAT DATA WILL RESUME
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.38  DEPARTURE.....+0.25
                         ASOS..............0.38  
TOTAL PRECIPITATION FOR THE MONTH..........2.35  DEPARTURE.....-0.29 
                         ASOS..............2.35    
TOTAL PRECIPITATION FOR THE YEAR..........26.51  DEPARTURE.....+2.13 
                         ASOS.............25.99   
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
6/1  87/56/72/+10/0.12/660/73       45 NNW  Aero 44 MPH TSTM AM/PM
6/2  87/64/76/+14/0.01/290/32       23 SSE  TSTM PM    
6/3  68/50/59/-3/0.14/000/000       24 NNE  TSTM AM (no rain)
6/4  63/50/57/-6/1.52/000/00        35 NE   TSTM 10:15-10:50 A.M. 
6/5  78/57/68/+5/0.01/455/50        38 S   
6/6  70/49/60/-3/0/637/70           35 W   
6/7  69/44/57/-7/0/528/58           23 W
6/8  78/58/68/+4/0/748/82           20 WSW
6/9  63/54/59/-5/0.02/000/00        18 ENE
6/10 70/50/60/-4/0/831/91           22 ENE 
6/11 77/62/70/+5/0.04/594/65        29 NE    
6/12 70/56/63/-2/0.09/192/21        29 NNE
6/13 56/50/53/-12/0.01/000/00       42 NNE   Aero 40 MPH NNE 
6/14 59/49/54/-11/0/036/04          34 NNE   
6/15 69/46/58/-8/0/769/84           21 NNE
6/16 80/55/68/+2/0/577/63           25 SW   
6/17 85/58/72/+6/T/632/69           31 W   
6/18 79/60/70/+4/0/880/96           23 NW
6/19 84/62/73/+6/0/578/63           25 SSW
6/20 74/60/67/0/0.38/.../..         25 W
 
6/21 morning low temp. 56 deg; normal now 57 deg.   
 
NEW DAILY RECORDS FOR JUNE: 
 
6/4 - NEW RECORD DAILY RAINFALL OF 1.52 INS; THE PREVIOUS 
      RECORD WAS 1.29 INS. IN 1898.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 21
HIGH 92F IN 1949
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000
 
RECORDS FOR JUNE 22
HIGH 93F IN 1921
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988
 
TODAY'S REPORT PREPARED By: Robert Skilling