BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 18, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME

Today's observations:
 
7 A.M.   
Weather: Partial obscurement, fog
Temperature: 69F, Dew point: 66F, Wind: SE at 04 kts 
Sea-level pressure: 30.03 inches Hg, falling
Visibility: 3 miles
6-hour min temp: 66F     
24-hour rainfall: 0.00  
BHO SA 1155 –X E5 OVC 3F 171/69/66/1404/003/ F5 FEW LWR STFRA 
HIER CLDS VSB DSNT NE-SE WND LGT/ 8/6// 55002 10069 20066
 
10 A.M.   
Weather: Partial obscurement, rain/fog
Temperature: 70F, Dew point: 67F, Wind: ESE at 07 kts 
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 3 miles, rain/fog
3-hour rainfall: trace
BHO SA 1455 –X E5 OVC 3R-F 161/70/67/1207/001/ F5/ 
8/6// 56010 MANUAL 6000/
 
1 P.M.   
Weather: Obscured, rain/fog
Temperature: 68F, Dew point: 67F, Wind: SE at 09 kts 
Sea-level pressure: 29.98 inches Hg, falling
Visibility: 1/8 mile, rain/fog    
6-hourly max. temp: 71 deg.   
6-hour rainfall: 0.10 in.
BHO SA 1755 W3 X 1/8R-F 152/68/67/1309/998/ 8//// 58009 
MANUAL 6010/ ASOS 60011 10071 20068
 
WEATHER SUMMARY FOR TUESDAY, JULY 17
 
TEMPERATURE (DEGREES F)
MAX.....85    NORMAL.....82 
MIN.....65    NORMAL.....62
MEAN....75    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL.......+3
TOTAL DEPARTURE FOR THE MONTH.......+2  (-0.1 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............18 WNW AT  4:28 A.M.      
                   AEROVANE...............16 WNW AT  4:28 A.M.     
                   ASOS...................N/A  #
                   DAVIS..................18 SSW AT 12:39 P.M.          
FASTEST MILE FOR YESTERDAY................13 WNW AT  4:37 A.M.       
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............14 WNW AT  4:30 A.M.           
AVERAGE WIND SPEED AND DIRECTION.........6.2 SW  
                   ASOS...................N/A  #
                   DAVIS.................6.2 SSW [209 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.....-1.07 
                         ASOS..............0.91    
TOTAL PRECIPITATION FOR THE YEAR..........27.97  DEPARTURE.....+0.24 
                   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 85/65/75/+3/0/.../..    18 WNW
 
7/18 morning low temp. 66 deg; normal low now 62 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 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
 
RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRE 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982
 
TODAY'S REPORT PREPARED By: Stephanie Radner