BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 25, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
TEMPERATURES SLIGHTLY COOLER TODAY
BUT PROLONGED WARM SPELL CONTINUES
SUNSHINE WELL OVER THE AUGUST AVERAGE
 
Temperatures are running a few degrees cooler
today than during the past week.  Actually
we've had a ten day stretch of very warm
August weather with daily temperature averages
ranging between 7 and 12 degrees above normal
15-24 August.  
Sunshine for the month is between 65 and 68% of
possible or well above the August long-term
average of 58%.
 
Today's observations:
 
7 A.M.  
Weather: Clear, few stratus east through south,
thin fog, fog dissipating past hour 
Temperature: 68F, Dew point: 66F, Wind: N at 5 kts
Sea-level pressure: 30.15 inches Hg, rising
Visibility: 6 miles, 9 to north, 7 to northeast,
thin fog   
6-hour minimum temp: 65F
BHO SA 1155 CLR 6F 211/68/66/3605/015/
FEW STRA E-S FG DSSPTNG PST HR VSBY N 9 NE 7/
8/600 51018 10068 20065
 
10 A.M.
Weather: Clear, stratocumulus forming except overhead
through northeast, smoke layer aloft W-N  
Temperature: 76F, Dew point: 65F, Wind: E at 5 kts,
Sea-level pressure: 30.15 inches Hg, falling
Visibility: 30 miles except northeast 20 miles,
light haze all quadrants 
BHO SA 1455 CLR 30 210/76/65/0805/015/ SC FRMG XCPT OVHD-NE
K LYR ALF W-N VSBY NE 20 LGT HAZE/ 8/500 58001
 
1 P.M.
Weather: Scattered cumulus, moderate cumulus except
distant NE-E  
Temperature: 80F, Dew point: 66F, Wind: E at 5 kts,
Sea-level pressure: 30.10 inches Hg, falling
Visibility: 30 miles, but 20 miles northeast to southeast,
light haze all quadrants 
6-hourly max. temp: 80F 
BHO SA 1755 40 SCT 50 SCT 30 194/80/66/1005/010/
CU/MDT CU ALQDS XCPT DSNT NE-E VSBY NE-SE 20 LGT HAZE/
8/200 58016 10080 20068
 
WEATHER SUMMARY FOR MONDAY, AUGUST 24
 
TEMPERATURE (DEGREES F)
MAX.....84    NORMAL.....77
MIN.....67    NORMAL.....60
MEAN....76    NORMAL.....69
 
DEPARTURE FROM 30-YEAR AVERAGE..........+ 7
TOTAL DEPARTURE FOR THE MONTH...........+88 [+3.5 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............30 N   AT 3:19 P.M. 
                   AEROVANE..............28 N   AT 3:19 P.M.  
                   ASOS..................28 N   AT 3:21 P.M.   
                   DAVIS.................32 NNW AT 3:19 P.M.  
FASTEST MILE FOR YESTERDAY...............21 N   AT 3:19 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE............21 N   AT 3:20 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 N   AT 3:20 P.M.
AVERAGE WIND SPEED AND DIRECTION....... 5.6 W
                   ASOS.................6.0
                   DAVIS............... 5.6 NW [310 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.71   DEPARTURE....-1.38
                         ASOS..............1.72
TOTAL PRECIPITATION FOR THE YEAR..........32.97   DEPARTURE....+0.47
                         ASOS.............34.10
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
8/1  83/63/73/+1/0/823/95     18 SSE
8/2  77/64/71/-1/T/104/12     25 SSE
8/3  84/67/76/+4/0/638/74     17 SW
8/4  83/66/75/+3/0/714/83     23 S
8/5  86/67/77/+5/T/378/44     27 SSW  TSTM
8/6  76/61/69/-3/0/564/66     18 SSE
8/7  79/58/69/-2/0/836/98     32 W
8/8  74/55/65/-6/0/791/93     21 WNW
8/9  76/59/68/-3/T/178/21     25 SSE 
8/10 87/66/77/+6/0.12/584/69  27 W    TSTM 
8/11 84/66/75/+4/0.54/684/81  25 NE   TSTM 
8/12 67/63/65/-6/T/000/00     18 N
8/13 66/60/63/-8/0.18/042/05  23 NNE
8/14 83/58/71/+1/0/762/91     16 S
8/15 88/66/77/+7/0/810/97     18 S
8/16 90/68/79/+9/0/749/90     22 S
8/17 91/69/80/+10/0/754/91    21 WSW
8/18 91/72/82/+12/0/776/94    29 SSW
8/19 89/71/80/+10/0/717/87    23 SW
8/20 83/70/77/+8/0.34/558/68  21 SSE  TSTM
8/21 88/72/80/+11/T/385/47    40 S #  AERO 39 MPH S
8/22 86/71/79/+10/0.03/629/77 28 S 
8/23 86/69/78/+9/0.50/367/45  25 S **  
8/24 84/67/76/+7/0/.../..     30 N 
 
8/25 our morning low temp: 65F; the normal low is now 59F
 
#  trace of precip. added for 21st (brief light drizzle)
** rainfall total on fringes of Hurricane Bill
   was 0.53 inch
 
NEW DAILY RECORDS FOR AUGUST 2009 TO DATE...
 
8/19: RECORD HIGH MINIMUM TEMPERATURE 71F;
      equals record previously set in 2002
8/23: RECORD HIGH MINIMUM TEMPERATURE 69F;
      equals record previously set in 1906
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 25
HIGH 93F IN 1947, 1948, 2007
LOW 41F IN 1940
PRECIP 1.72 INCHES IN 1958
PEAK GUST 60e MPH SSW 1941
 
RECORDS FOR AUGUST 26
HIGH 96F IN 1900, 1948
LOW 46F IN 1885
PRECIP 5.85 INCHES IN 1924
PEAK GUST 55e MPH NNW 1947
 
TODAY'S REPORT PREPARED BY: Robert Skilling