BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, AUGUST 27, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY SUNNY, COOLER AND MUCH DRIER TODAY 
AUGUST MAY BECOME 2ND DRIEST ON RECORD
 
A very welcome clear, cooler and much drier airmass
which began arriving yesterday replaced the record 
equaling 93-degree heat of Saturday, August 25th.  The 
humidity was particularly oppressive with dew points
reaching the low to mid-70's and heat indexes of 
103 to 105 degrees. By comparison, today's temperatures
have reached the upper 70's with dew points falling to 
lower 50's this afternoon.  
 
Only a brief 15-minute very light rain shower accompanied 
the gradual air mass change with the passage of a cold 
front yesterday. 
 
Our August rainfall continues at only 0.62 inch, far below 
the normal of 4.06 inches.  The month could slide into 
second place in the ranking of driest Augusts. 

Driest Augusts (inches)
 
1) 0.53 in 1981
2) 0.91 in 1984
3) 1.05 in 1910
 
Today's observations:
 
7 A.M.   
Weather: Clear, few stratocumulus dissipating past hour
Temperature: 68F, Dew point: 59F, Wind: NNE at 11 kts
Wind: gradually veering
Sea-level pressure: 30.16 inches Hg, rising
Visibility: 35 miles, light haze 
6-hour min temp: 65F
24-hour rainfall: trace 
BHO SA 1155 CLR 35 214/68/59/0211/016/ FEW SC/CLDS 
DSSPTD PST HR WND 34V04 GRDLY VEERING/
8/500 51020 10068 20065 
 
10 A.M.   
Weather: Clear, cumulus forming SW-N, few stratocumulus 
Temperature: 74F, Dew point: 56F, Wind: NNE at 12G20 kts 
Wind: variability N-ENE
Sea-level pressure: 30.19 inches Hg, rising
Visibility:  50 miles, 45 WNW light haze 
BHO SA 1455 CLR 50 223/74/56/0312G20/019/ CU/FEW MDT FRMG SW-N
FEW SC/SCSL ALQDS VSBY WNW 45 LGT HZ WND 36V07/ 8/800 50009 
 
1 P.M.   
Weather: Clear, cumulus, stratocumulus S-W-N, cirrus distant SE-S  
Temperature: 77F, Dew point: 52F, Wind: NE at 11 kts 
Wind: variability N-E 
Sea-level pressure: 30.17 inches Hg, falling
Visibility:  55 miles 
BHO SA 1755 CLR 55 216/77/52/0511/017/ CU/SC S-W-N 
CI DSNT SE-S WND 36V09/ 8/401 55007 10078 20068 
 
WEATHER SUMMARY FOR SUNDAY, AUGUST 26
 
TEMPERATURE (DEGREES F)
MAX.....84    NORMAL.....77 
MIN.....68    NORMAL.....59
MEAN....76    NORMAL.....68
DEPARTURE FROM 30-YEAR NORMAL........ +8
TOTAL DEPARTURE FOR THE MONTH........+11  (+0.7 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............21 SSW AT 12:02 A.M.   
                   AEROVANE...............20 SSW AT 12:02 A.M.  
                   ASOS...................N/A  #
                   DAVIS..................N/A  *
FASTEST MILE FOR YESTERDAY................16 SSW AT 12:03 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............N/A  *
AVERAGE WIND SPEED AND DIRECTION...........9.1 W
                   ASOS...................N/A  #
                   DAVIS..................10.1 WSW [250 deg]  
 
* Davis data not available due to time difference 
 
# 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....TRACE DEPARTURE.....-0.14
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE MONTH..........0.62  DEPARTURE.....-2.74 [corrected]*  
                         ASOS..............0.55    
TOTAL PRECIPITATION FOR THE YEAR..........30.98  DEPARTURE.....-1.79 [corrected]*
                         ASOS.............30.22    
 
* corrections of +.01 in. on departures from yesterday's report
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
 
8/1  84/67/76/+4/0/851/98     20 NNE    
8/2  92/68/80/+8/0/823/95     21 S     
8/3  92/70/81/+9/0/760/88     28 SSW
8/4  89/71/80/+8/0/827/96     29 WSW  
8/5  80/62/71/-1/0/842/98     23 SSE 
8/6  77/61/69/-3/0.05/129/15  36 SSE  Aero 34 MPH SSE TSTM  
8/7  82/67/75/+4/0.12/410/48  15 SSE 
8/8  88/70/79/+8/0.10/349/41  36 S
8/9  75/60/68/-3/0/722/85     32 NW
8/10 63/53/58/-13/0.19/017/02 16 SSW
8/11 83/52/68/-3/0/743/88     21 WNW
8/12 86/64/75/+4/0/665/79     21 SSW
8/13 83/64/74/+3/0.01/260/31  30 NW   TSTM 
8/14 78/58/68/-2/0/812/97     23 NW
8/15 83/59/71/+1/0/651/78     36 SSW  Aero 34 MPH SSW
8/16 87/67/77/+7/0/641/77     33 SSW
8/17 78/62/70/0/0.07/241/29   43 S    Aero 39 MPH S TSTM  
8/18 71/52/62/-8/0.08/761/92  46 WNW  Aero 42 MPH WNW, Davis 46 MPH WNW TSTM  
8/19 74/51/63/-7/0/619/75     25 WNW  
8/20 70/56/63/-6/0/411/50     21 ENE
8/21 68/56/62/-7/0/271/33     23 E  
8/22 70/55/63/-6/0/.../..     23 NE    
8/23 75/59/67/-2/T/.../..     22 SSE   
8/24 88/66/77/+8/0/.../..     30 SSW  
8/25 93/69/81/+13/0/.../..    25 SSE  
8/26 84/68/76/+8/T/169/21     22 S
 
8/27 morning low temp. 65F; normal low now 59F 
 
NEW DAILY RECORDS FOR AUGUST 2007: 
 
8/18 - NEW RECORD PEAK GUST FOR OF 46 MPH WNW; 
the previous record was 39 MPH SW in 1991
8/25 - RECORD HIGH TEMPERATURE OF 93F;
ties previous record set in 1947,1948
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 27
HIGH 99F IN 1948
LOW 44F IN 1885
PRECIP 2.77 INCHES IN 1946
PEAK GUST 48 MPH NW 1983
 
RECORDS FOR AUGUST 28
HIGH 95F IN 1948
LOW 43F IN 1885
PRECIP 1.80 INCHES IN 1922
PEAK GUST 87 MPH SSE 1971
 
TODAY'S REPORT PREPARED By: Robert Skilling