BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, AUGUST 1, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's discussion....
First here are the stats....
 
MONTH OF JULY 2007 
Mean temp: 71.9 [+0.3]
HDD = 11 [+2] 
CDD = 229 [+14]
24-HOUR CORR. MEAN TEMP: 70.6 deg. 
Average vapor pressure: 18.6 mbs
Precip: 3.38 [-0.36 in. ]
Hail: trace [28th]
Thunderstorm days: 5  
Wind: Prevailing S 19%
Corrected average: 10.8 MPH 
Sunshine: 276.8 hours [corrected] or 60%
Uncorrected sunshine: 263.1 hours or 59%
 
JULY 2007....NEAR NORMAL IN TEMPERATURE AND PRECIPITATION
 
The month of July was extremely close to normal in temperature and 
above normal by only 0.3 degree.  There were three days with 90-degree
temperatures but only two were consecutive and so not heat waves were 
recorded. Almost two inches of rainfall during the last few days of 
the month made up for much of an increasing monthly deficit so that 
when the month was over our precipitation total was 90% of the average.
There were five days with thunder.  Sunshine was 60% of possible and 
was several points above average for the month.  
 
Today's observations:
 
7 A.M.   
Weather: Clear, few altocumulus S-W-NNW 
Temperature: 74F, Dew point: 64F, Wind: N at 09 kts
Sea-level pressure: 29.96 inches Hg, rising
Visibility: 20 miles
6-hour min temp: 67F     
24-hour rainfall: None 
BHO SA 1155 CLR 20 144/74/64/3609/996/ FEW AC S-W-NNW HAZY 
WND GRDLY VEERING/ 8/030 53016 10074 20067
 
10 A.M.   
Weather: Clear
Temperature: 80F, Dew point: 58F, Wind: NE at 11 kts
Wind: Variability NNW-E
Sea-level pressure: 29.97 inches Hg, rising
Visibility: 25 miles  
BHO SA 1455 CLR 25 148/80/58/5011/997/ WND 34V10/ 53004
 
1 P.M.   
Weather: Clear, cumulus S-W-N,
thin smoke layer along and above horizon NE     
Temperature: 84F, Dew point: 54F, Wind: ENE at 09 kts  
Wind: Variability NNE-E
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 35 miles
BHO SA 1755 CLR 35 144/84/54/0709/996/ CU S-W-N THN K 
LYR NR HRZN NE AND ALF NE-SE VSBY NE 25 WND 03V10/ 8/100 
58004 10084 20074
 
WEATHER SUMMARY FOR TUESDAY, JULY 31
 
TEMPERATURE (DEGREES F)
MAX.....82    NORMAL.....81 
MIN.....66    NORMAL.....63
MEAN....74    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL........+2
TOTAL DEPARTURE FOR THE MONTH........+12  (0.3 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............20  ENE AT 12:53 P.M.  
                   AEROVANE...............17  ENE AT 12:53 P.M.         
                   ASOS...................N/A  #
                   DAVIS..................18  ENE AT 12:53 P.M.           
FASTEST MILE FOR YESTERDAY................12  ENE AT 12:54 P.M.            
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............14  ENE AT 12:54 P.M.             
AVERAGE WIND SPEED AND DIRECTION......... 5.7 NNW   
                   ASOS...................N/A  #
                   DAVIS................. 5.6 NNW [325 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 THE MONTH..........3.38  DEPARTURE.....-0.36 
                         ASOS..............2.26    
TOTAL PRECIPITATION FOR THE YEAR..........30.36  DEPARTURE.....+0.95
                   ASOS FOR YEAR..........29.67    
 
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/+1/0.01/813/90  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 85/65/75/+3/0/591/66     18 WNW
7/18 71/66/69/-3/0.21/000/00  23 SE   
7/19 83/65/74/+2/0.20/205/23  31 S   
7/20 82/61/72/0/0/330/37      29 WSW
7/21 77/58/68/-4/0/436/49     23 WNW 
7/22 77/61/69/-3/0/826/93     24 ENE   
7/23 64/60/62/-10/0.07/000/00 32 NNE
7/24 82/62/72/-1/0/796/90     25 SW
7/25 88/63/76/+3/0/864/98     21 WSW   
7/26 91/65/78/+6/0/845/96     21 S
7/27 90/69/80/+8/0/755/86     29 S
7/28 87/69/78/+6/0.90/254/29  24 WNW  TSTM  
7/29 83/69/76/+4/0/428/49     24 E 
7/30 79/66/73/+1/1.01/244/28  20 SW   TSTM
7/31 82/66/74/+2/0/539/62     20 ENE 
 
8/1 morning low temp. 67 deg; normal low now 63 deg.  
     
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 AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985
 
RECORDS FOR AUGUST 2
HIGH 101F IN 1975 [STATION RECORD MAXIMUM - Tied with 8/10/1949]
LOW 50 IN 1929, 1947
PRECIP 1.59 INCHES IN 1946
PEAK GUST 50 MPH SW IN 2006

TODAY'S REPORT PREPARED By: Robert Skilling and Eli Melaas