BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 24, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNSHINE RETURNS TODAY WITH MUCH WARMER TEMPERATURES
NORTH-NORTHEAST WIND GUSTS TO 32 MPH AND HEAVILY 
OVERCAST SKY WITH LIGHT DRIZZLE BRING THE 2ND COOLEST
HIGH TEMPERATURE FOR ANY JULY 23RD ON RECORD
 
Our temperature has reached the lower 80's early this afternoon.
 
Coming at what is historically the warmest time of the 
year, yesterday's high temperature of 64 degrees was just
two degrees short of the record low maximum for the date 
and appears to be our 2nd coolest high temperature reading
for any July 23rd on record.
 
Low overcast and foggy conditions along with some light 
drizzle and gusty northeast winds combined with the unseas-
onably cool weather making yesterday feel like a day 
which would be normal during early October.   
 
Today's observations:
 
7 A.M.   
Weather: Overcast stratus,stratocumulus, numerous breaks in overcast     
Ceiling ragged
Temperature: 64F, Dew point: 60F, Wind: SW at 10 kts
Wind: Gradually veering  
Sea-level pressure: 30.12 inches Hg, rising
Visibility: 25 miles, SE 30 miles 
6-hour min temp: 62F     
24-hour rainfall: 0.06 in. 
BHO SA 1155 E12 OVC 25 198/64/60/2210/012/ CIG RGD 
12 OVC V BKN NMRS BINOVC ALQDS HIER CLD AC/CI VSB OVHD-NE-E 
VSBY SE 30 WND GRDLY VEERING/ 8/541 51010 ASOS 70005
MANUAL 70006 10064 20062 
 
10 A.M.   
Weather: Scattered stratocumulus, thin broken cirrus 
Temperature: 71F, Dew point: 61F, Wind: SSW at 10 kts
Wind: Variability S-WSW  
Sea-level pressure: 30.11 inches Hg, steady
Visibility: 40 miles, 45 WNW 
BHO SA 1455 15 SCT 200 SCT 250 –BKN 40 196/71/61/2110/011/
FEW PTCHS DENSE CI VSBY WNW 45 WND 18V24/ 8/502 56002
 
1 P.M.   
Weather: Scattered high cirrus, cirrocumulus clouds with lower cumulus  
Temperature: 80F, Dew point: 59F, Wind: WSW at 11 kts
Wind: Variable in direction SSW-W, gust to 21 kts past hour  
Sea-level pressure: 30.08 inches Hg, falling
Visibility: 60 miles, 70 NW  
6-hourly max. temp: 81F    
BHO SA 1755 250 –SCT 300 –SCT 60 187/80/59/2411/008/
CUFRA/CU ALQDS FEW MDT SW-N LWR DENSE CI SW-NW FEW CC ALQDS 
VSBY NW 70 WND 20V27 GST 21 KTS PST HR/ 8/202 58009 10081 20064 
  
WEATHER SUMMARY FOR MONDAY, JULY 23
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....82 
MIN.....60    NORMAL.....63
MEAN....62    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL.......-10
TOTAL DEPARTURE FOR THE MONTH.......-16  (-0.9 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............32 NNE AT 5:12 P.M. *      
                   AEROVANE...............30 NNE AT 5:12 P.M.     
                   ASOS...................N/A  #
                   DAVIS..................31 NE AT 5:56 P.M.          
FASTEST MILE FOR YESTERDAY................24 NNE AT 4:47 P.M. *        
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............23 NNE AT 4:47 P.M.            
AVERAGE WIND SPEED AND DIRECTION..........15.0 NNE  
                   ASOS...................N/A  #
                   DAVIS..................15.0 NE [038 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....0.06  DEPARTURE.....-0.06
                         ASOS..............0.05 
TOTAL PRECIPITATION FOR THE MONTH..........1.47  DEPARTURE.....-1.31 
                         ASOS..............1.31    
TOTAL PRECIPITATION FOR THE YEAR..........28.45  DEPARTURE......0.00
                   ASOS FOR YEAR..........27.77    
 
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/.../..     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 77/61/69/-3/0/826/93     24 ENE [mean temp. corrected]  
7/23 64/60/62/-10/0.07/000/00 32 NNE
 
7/24 morning low temp. 62 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 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
 
RECORDS FOR JULY 25
HIGH 94F IN 1963,1987
LOW 51F IN 1901,1953
PRECIP 2.25 INCHES IN 1990
PEAK GUST 88 MPH NW IN 1972
 
TODAY'S REPORT PREPARED By: Robert Skilling and Eli Melaas