BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 17, 2008     
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED 
 
Today's observations:
 
8 A.M. EDT
Weather: Thin broken cirrus
Temperature: 72F, Dew point: 63F,  Wind: WNW at 5 kts 
Sea-level pressure: 30.13 inches Hg, rising
Visibility: 15 miles, hazy
6-hourly minimum temperature: 68F     
24-hourly rainfall: 0.00 in.
BHO SA 1155 200 SCT 250 –BKN 15 202/72/63/2905/013/ 
PTCHS DNS CI HAZY/ 8/002 53009 10072 20068
 
11 A.M. EDT
Weather: Thin broken cirrus, few cumulus WSW-N and ESE
Temperature: 82F, Dew point: 61F,  Wind: NNW at 6 kts 
Sea-level pressure: 30.12 inches Hg, falling
Visibility: 15 miles, hazy   
BHO SA 1455 250 -BKN 15 199/82/61/3306/012/ FEW CU WSW-N 
AND ESE PTCHS DNS CI HAZY WND LGT AND VRB/ 8/102 58003
 
2 P.M. EDT
Weather: Scattered cumulus, scattered cirrostratus, overcast 
cirrus, breaks and thin spots in overcast
Temperature: 86F, Dew point: 60F,  Wind: NNE at 6 kts
Sea-level pressure: 30.10 inches Hg, falling
Visibility: 20 miles, hazy
6-hourly max. temp. 86F  
BHO SA 1755 50 SCT 220 SCT E250 OVC 20 192/86/60/0206/010/ 
FEW MDT CU S-W-N BRKS IOVC HAZY WND LGT AND VRB/ 8/207 58007 
10086 20072
 
WEATHER SUMMARY FOR WEDNSDAY, JULY 16
 
TEMPERATURE (DEGREES F)
MAX.....88    NORMAL.....82
MIN.....66    NORMAL.....62
MEAN....77    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.............+5 
TOTAL DEPARTURE FOR THE MONTH............+44[+2.6 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............22 SSE AT  7:35 P.M.     
                   AEROVANE.............21 SSE AT  7:35 P.M.       
                   ASOS.................20 S   AT  8:06 P.M.      
                   DAVIS................22 SSE AT  7:35 P.M.  
FASTEST MILE FOR YESTERDAY..............14 SSE AT  8:06 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE...........15 S   AT  8:03 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........16 SSE AT  8:03 P.M.      
                   AVERAGE............ 7.1 NW  
                   ASOS................6.5    
                   DAVIS...............6.7 SW [222 deg] 
* last of several occurrences....
 
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..........1.76   DEPARTURE......-0.18  
                         ASOS..............1.79   
TOTAL PRECIPITATION FOR THE YEAR..........26.76   DEPARTURE......-0.85    
                         ASOS.............29.17 #
# Includes erroneous ASOS precipitation data on 2/13/08.
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
7/1  83/66/75/+5/0.15/411/45     28 SSW   TSTM
7/2  84/61/73/+3/1.02/593/65     44 W     TSTM Small hail *
7/3  85/63/74/+4/T/793/87        45 SW    Aero 44 MPH SW
7/4  69/59/64/-6/0.22/018/02     25 NE
7/5  70/62/66/-5/0.01/000/00     17 E
7/6  81/65/73/+2/0/245/27        20 S
7/7  86/67/77/+6/0/563/62        21 S
7/8  89/69/79/+8/0/753/83        30 SSE  
7/9  88/70/79/+8/T/734/81        36 SSW  TSTM Aero 35 MPH SSW
7/10 82/65/74/+3/T/887/98        28 W    Aero 29 MPH W
7/11 83/61/72/0/0/759/84         17 NW   
7/12 82/65/74/+2/0/631/70        28 S  
7/13 81/66/74/+2/0/784/87        38 S    Aero 40 MPH S  
7/14 80/67/74/+2/0.36/468/52     23 W    TSTM 
7/15 87/67/77/+5/0/799/89        22 SSW
7/16 88/66/77/+5/0/.../..        22 SSE
 
7/17 morning low temp. 68F; our normal low now 62F
 
NEW DAILY RECORDS FOR JULY 
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: Stephanie Radner