BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 17, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM WITH LOW TO MODERATE HUMIDITY TODAY
 
An early morning temperature inversion resulted in low 
temperatures down in the mid-50's at Norwood Aiport while
here at the Observatory the low was 65 degrees. Variable
cloudiness, but generally partly sunny conditions has allowed
temperatures to rise into the middle 80's today with dewpoints
still in the mid to upper 50's. 
 
Today's observations:
 
7 A.M.   
Weather: Broken clouds, thin smoke layer horizons
Temperature: 70F, Dew point: 57F, Wind: N at 05 kts 
Sea-level pressure: 30.03 inches Hg, rising
Visibility: 30 miles
6-hour min temp: 65F     
24-hour rainfall: 0.00  
BHO SA 1155 E100 BKN 30 171/70/57/3505/003/ AC LYR ADVCNG PST 
HR LGE CLR SKY BND XTDNG NE-S NMRS SML BINOVC OVHD INVSN PRSNT 
THN K LYR ALG HRZN N-NE AND SE-SW VSBY W-NW 60 ABV INVSN NE 20/ 
8/050 51011 10072 20065
 
10 A.M.   
Weather: Broken clouds
Temperature: 79F, Dew point: 57F, Wind: SSE at 07 kts 
Wind: Variablilty ESE-S  
Sea-level pressure: 30.05 inches Hg, rising
Visibility: 30 miles, hazy
BHO SA 1455 100 BKN 25 178/79/57/1507/006/ FEW SM CU FRMG N 
THN K LYR NE VSBY NE 20HAZY WND 11v19/ 8/170 51007
 
1 P.M.   
Weather: Overcast with breaks, modt cumulus and altocumulus castellanus  
Temperature: 82F, Dew point: 57F, Wind: SSW at 08 kts 
Wind: Variable S-WSW   
Sea-level pressure: 30.05 inches Hg, falling
Visibility: 35 miles, 45 WNW, light haze    
6-hourly max. temp: 83 deg.   
BHO SA 1755 65 SCT 75 SCT E85 OVC 35 176/82/57/2108/005/
MDT CU AND ACC ALQDS BINOVC VSBY WNW 45 LGT HZ WND 18V24/
8/28/ 58002 10083 20070
 
WEATHER SUMMARY FOR MONDAY, JULY 16
 
TEMPERATURE (DEGREES F)
MAX.....84    NORMAL.....82 
MIN.....65    NORMAL.....62
MEAN....75    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL.......+3
TOTAL DEPARTURE FOR THE MONTH.......-1  (-0.1 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............18 WNW AT 3:26 A.M.      
                   AEROVANE...............16 WNW AT 3:20 A.M.     
                   ASOS...................N/A  #
                   DAVIS..................18 S   AT 3:56 P.M.          
FASTEST MILE FOR YESTERDAY................11 WNW AT 3:28 A.M.       
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............13 WNW AT 3:27 P.M.           
AVERAGE WIND SPEED AND DIRECTION.........6.4 WNW  
                   ASOS...................N/A  #
                   DAVIS.................6.3 WSW [250 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...............0.99  DEPARTURE.....-0.95 
                         ASOS..............0.91    
TOTAL PRECIPITATION FOR THE YEAR..........27.97  DEPARTURE.....+0.36 
                   ASOS FOR YEAR..........27.32    
 
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/-9/0.02/649/71/28 W      
7/2  73/50/62/-8/0/841/92/   29 WNW 
7/3  75/53/64/-6/0/839/92/   23 NW 
7/4  78/58/68/-2/0.09/465/51/45 SSE 
7/5  80/61/71/ 0/0.25/383/42/38 SSE TSTM   
7/6  83/62/73/+2/0.01/482/53/46 WNW TSTM  
7/7  81/60/71/0/0/509/56/    32 WSW   
7/8  90/62/76/+5/0.41/563/62/36 NW Aero 33 MPH TSTM 
7/9  86/61/74/+3/0.20/354/39 27 NNE TSTM
7/10 80/62/71/0/0/680/75     27 S 
7/11 84/70/77/+5/T/371/41*   32 S
7/12 81/64/73/+1/.01/813*/90 27 WNW
7/13 84/62/73/+1/0/695/77    36 WSW
7/14 82/62/72/0/T/765/85     33 SSE
7/15 87/65/76/+4/T/638/71    44 S Aero 45 MPH S, Davis 48 MPH S     
7/16 84/65/75/+3/0/449/50    18 WNW
 
7/17 morning low temp. 65 deg; normal low now 62 deg.
 
*7/11 sunshine mins. and % corrected from 383 and 43%
 7/12 sunshine mins. corrected from 810
 
NEW DAILY RECORDS FOR JULY 2007: 
 
None to date
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971
 
RECORDS FOR JULY 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949
 
TODAY'S REPORT PREPARED By: Robert Skilling and Eli Melaas