BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 4, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
INCOMING CLOUDS THREATEN FIREWORKS DISPLAYS
 
Temperatures returned to normal early this afternoon reaching 
a high of 79 degrees. Conditions were once again comfortable 
with our dew point in the low 50s, however moderate cumulus 
clouds began forming out of the west and radars show possible 
threatening precipitation for this evening's  Independence Day 
celebrations. Winds picked up around the final observation, 
gusting up to 28 knots from the SSE. 
 
Today's observations:
 
7 A.M.   
Weather: Clear but hazy, few cirrus WSW-N
Temperature: 65F, Dew point: 57F, Wind: SSW at 8 kts 
Sea-level pressure: 30.19 inches Hg, rising
Visibility: 20 miles
6-hour min temp: 59F    
24-hour precip: 0.00 
BHO SA 1155 300 CLR 20 226/65/57/2008/019/ FEW CI WSW-N HAZY/ 8/001
53004 10065 20059
 
10 A.M. 
Weather: Few cirrus, few cumulus WSW-NE 
Temperature: 76F, Dew point: 52F, Wind: SSW at 16G20 kts
Wind: Direction variable S-WSW
Sea-level pressure: 30.17 inches Hg, falling 
Visibility: 25 miles     
BHO SA 1455 60 250 CLR 25 217/76/52/2116G20/017/ 
FEW CU WSW-NE BKN CI ALQDS WND 18V24/ 8/101 58007      
 
1 P.M. 
Weather: Moderate cumulus forming SSW-N  
Temperature: 75F, Dew point: 55F, Wind: S at 19G26 kts
Wind: Peak Gust 27 kts S at 12:38 P.M.
Sea-level pressure: 30.16 inches Hg, falling 
Visibility: 25 miles 
6-hour max temp: 79F
BHO SA 1755 45 FEW 50 SCT 25 214/75/55/1719G26/016/ 
MOD CU FRMG SSW-N FEW CU ENE-S CLR DNST N-E PK WND 1627/38/
8/201 57005 10079 20064 
 

WEATHER SUMMARY FOR MONDAY, JULY 3
 
TEMPERATURE (DEGREES F)
MAX.....75    NORMAL.....79 
MIN.....53    NORMAL.....60
MEAN....64    NORMAL.....70
DEPARTURE FROM 30-YEAR NORMAL............. -6
TOTAL DEPARTURE FOR THE MONTH............ -23 [-7.9 per day]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23  NW   AT 11:04 A.M.     
                   AEROVANE.............20  WNW  AT 10:36 A.M.   
                   ASOS.................N/A  #
                   DAVIS................24  W    AT 12:19 A.M.        
FASTEST MILE FOR YESTERDAY..............16  SE   AT 6:43 P.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........18  SE   AT 6:46 P.M.          
AVERAGE WIND SPEED AND DIRECTION........9.8 WNW 
                   ASOS.................N/A  #
                   DAVIS................10.0 W [268 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....0.00  DEPARTURE.....-0.12
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR JULY...............0.02  DEPARTURE.....-0.36 
                         ASOS..............0.02    
TOTAL PRECIPITATION FOR THE YEAR..........27.00  DEPARTURE.....+0.95 
                   ASOS FOR YEAR..........26.43    
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
 
7/1  70/52/61/-9/0.02/649/71      
7/2  73/50/62/-8/0/841/92
7/3  75/53/64/-6/0/.../..
 
7/4  morning low temp. 58 deg; normal now 60 deg.
 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 4
HIGH 98F IN 1911, 1919, 1949
LOW 48F IN 1914
PRECIP 1.78 IN 1950
PEAK GUST 50e MPH WNW IN 1949
 
RECORDS FOR JULY 5
HIGH 98F IN 1911
LOW 48F IN 1920, 1927 & 1979
PRECIP 1.45 INS IN 1922
PEAK GUST 44e N IN 1944

TODAY'S REPORT PREPARED By: Eli Melaas