BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 23, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY COOL AND DAMP TODAY AFTER PLEASANT COOL DRY WEEKEND 
TODAY'S TEMPERATURES RUNNING MUCH COOLER THAN NORMAL
ONLY A VERY SMALL AMOUNT OF PRECIPITATION 
 
Low overcast, very cool and damp conditions today include 
include northeast winds gusting to near 30 MPH.  The weather
today is a complete turn around from the pleasantly mostly 
sunny and cool dry weather over the weekend. In fact the 
highest temperature through early afternoon of 63 degrees is but
one degree above our record low maximum for any July 23rd of 
62 degrees recorded in 1904.
 
The weekend temperatures continued the near normal to slightly
cooler than normal trend of July by averaging 3 degrees below normal. 
Since July 3rd, however, temperatures actually have averaged slightly 
above normal but by only 0.7 degree. The first 3 days of the month 
averaged 7 degrees cooler than normal.
 
Very little precipitation has fallen through early this afternoon 
today with only a few hundreths in mostly light drizzle.  
 
Today's observations:
 
7 A.M.   
Weather: Low overcast stratus fractus, higher nimbostratus overcast
Light rain showers began and ended past hour    
Temperature: 62F, Dew point: 60F, Wind: NE at 14G21 kts 
Sea-level pressure: 30.16 inches Hg, rising
Visibility: 25 miles, thin fog, east thru south 12, WNW 45 
6-hour min temp: 60F     
6 & 24-hour rainfall: 0.01 in. 
BHO SA 1155 E5 OVC 25 226/62/60/0414G21/020/ 
HIER NS OVC OCNL VSB ESTMTD 40 VSBY E-S 12 WNW 45 
RBEUKN WND 01V07/ 8/72/ 58002 MANUAL 6001/ 
ASOS 60001 MANUAL 70001 ASOS 70001 10062 20060 
 
10 A.M.   
Weather: Obscurement with heavy fog, light drizzle,
Ceiling and visibility lowered rapidly    
Temperature: 62F, Dew point: 62F, Wind: NE at 14G22 kts 
Sea-level pressure: 30.18 inches Hg, steady
Visibility: 1/16 mile
3-hourly rainfall: trace 
BHO SA 1455 W2 X 1/16L-F 219/62/62/0414G22/018/ 
CIG/VSBY LWRD RPDLY WND 36V07/ 8//// 56007 MANUAL 6000/
 
1 P.M.   
Weather: Obscurement with heavy fog, very light drizzle   
Temperature: 62F, Dew point: 62F, Wind: NE at 15G24 kts 
Sea-level pressure: 30.15 inches Hg, falling
Visibility: 1/8 mile, variable 1/16 to 1/4 mile 
6-hourly max. temp: 63 deg.   
6-hourly precip: 0.03 in. 
BHO SA 1755 W2 X 1/8VL-F 211/62/62/0415G24/015/ STRA DRFTG OVR SMT 
VSBY 1/16V1/4 PCPN VRY LGT INTMT WND 01V07/ 8//// 56008 ASOS 60003 
MANUAL 6003/ 10063 20062 
 
WEATHER SUMMARY FOR SUNDAY, JULY 22
 
TEMPERATURE (DEGREES F)
MAX.....77    NORMAL.....82 
MIN.....61    NORMAL.....63
MEAN....69    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL.......-3
TOTAL DEPARTURE FOR THE MONTH.......-6  (-0.1 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............24 ENE AT 4:12 P.M.. *      
                   AEROVANE...............21 NNE AT     
                   ASOS...................N/A  #
                   DAVIS..................24 NNE AT 8:51 A.M.          
FASTEST MILE FOR YESTERDAY................16 NNE AT 8:52 A.M.        
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............18 ENE AT 4:12 P.M.            
AVERAGE WIND SPEED AND DIRECTION..........11.3 NE  
                   ASOS...................N/A  #
                   DAVIS..................11.2 NNE [020 deg] 
 
* last of several occurrences....
 
# 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....0.01  DEPARTURE.....-0.11
                         ASOS..............0.01 
TOTAL PRECIPITATION FOR THE MONTH..........1.41  DEPARTURE.....-1.25 
                         ASOS..............1.31    
TOTAL PRECIPITATION FOR THE YEAR..........28.39  DEPARTURE.....+0.06
                   ASOS FOR YEAR..........27.72    
 
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 71/66/69/-3/0.21/000/00 23 SE   
7/19 83/65/74/+2/0.20/.../.. 31 S   
7/20 82/61/72/0/0/.../..     29 WSW
7/21 77/58/68/-4/0/436/49    23 WNW 
7/22 77/61/79/-3/0/826/93    24 ENE   
 
7/23 morning low temp. 60 deg; normal low now 63 deg; 
     rainfall thru 7 a.m. 0.01 inch
 
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 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INCHES IN 1953
PEAK GUST 54e MPH S IN 1946
 
RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.21 INCHES IN 1988
PEAK GUST 41 MPH S IN 1975, 41e MPH WSW 1977
 
TODAY'S REPORT PREPARED By: Robert Skilling